darshan-mpi-io.c 69.5 KB
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/*
 *  (C) 2009 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

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#define _XOPEN_SOURCE 500
#define _GNU_SOURCE /* for tdestroy() */

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#include "darshan-config.h"

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#include <stdio.h>
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#ifdef HAVE_MNTENT_H
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#include <mntent.h>
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#endif
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#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/types.h>
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#include <sys/stat.h>
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#include <zlib.h>
#include <assert.h>
#include <search.h>

#include "mpi.h"
#include "darshan.h"

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#ifdef DARSHAN_PRELOAD
#include <dlfcn.h>
#include <stdlib.h>

#define DARSHAN_MPI_CALL(func) __real_ ## func

#define DARSHAN_FORWARD_DECL(name,ret,args) \
  ret (*__real_ ## name)args = NULL;

#define MAP_OR_FAIL(func) \
    __real_ ## func = dlsym(RTLD_NEXT, #func); \
    if (!(__real_ ## func)) { \
        fprintf(stderr, "Darshan failed to map symbol: %s\n", #func); \
    }

DARSHAN_FORWARD_DECL(PMPI_File_close, int, (MPI_File *fh));
DARSHAN_FORWARD_DECL(PMPI_File_set_size, int, (MPI_File fh, MPI_Offset size));
DARSHAN_FORWARD_DECL(PMPI_File_iread_at, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Request *request));
DARSHAN_FORWARD_DECL(PMPI_File_iread, int, (MPI_File fh, void  *buf, int  count, MPI_Datatype  datatype, MPI_Request  *request));
DARSHAN_FORWARD_DECL(PMPI_File_iread_shared, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Request *request));
DARSHAN_FORWARD_DECL(PMPI_File_iwrite_at, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Request *request));
DARSHAN_FORWARD_DECL(PMPI_File_iwrite, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Request *request));
DARSHAN_FORWARD_DECL(PMPI_File_iwrite_shared, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Request *request));
DARSHAN_FORWARD_DECL(PMPI_File_open, int, (MPI_Comm comm, char *filename, int amode, MPI_Info info, MPI_File *fh));
DARSHAN_FORWARD_DECL(PMPI_File_read_all_begin, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_read_all, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_read_at_all, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_read_at_all_begin, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_read_at, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_read, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_read_ordered_begin, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_read_ordered, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_read_shared, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_set_view, int, (MPI_File fh, MPI_Offset disp, MPI_Datatype etype, MPI_Datatype filetype, char *datarep, MPI_Info info));
DARSHAN_FORWARD_DECL(PMPI_File_sync, int, (MPI_File fh));
DARSHAN_FORWARD_DECL(PMPI_File_write_all_begin, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_write_all, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_write_at_all_begin, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_write_at_all, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_write_at, int, (MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_write, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_write_ordered_begin, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype));
DARSHAN_FORWARD_DECL(PMPI_File_write_ordered, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_File_write_shared, int, (MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status));
DARSHAN_FORWARD_DECL(PMPI_Finalize, int, ());
DARSHAN_FORWARD_DECL(PMPI_Init, int, (int *argc, char ***argv));
DARSHAN_FORWARD_DECL(PMPI_Init_thread, int, (int *argc, char ***argv, int required, int *provided));

DARSHAN_FORWARD_DECL(PMPI_Wtime, double, ());
DARSHAN_FORWARD_DECL(PMPI_Allreduce, int, (void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm));
DARSHAN_FORWARD_DECL(PMPI_Bcast, int, (void *buffer, int count, MPI_Datatype datatype, int root, MPI_Comm comm));
DARSHAN_FORWARD_DECL(PMPI_Comm_rank, int, (MPI_Comm comm, int *rank));
DARSHAN_FORWARD_DECL(PMPI_Comm_size, int, (MPI_Comm comm, int *size));
DARSHAN_FORWARD_DECL(PMPI_Scan, int, (void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm));
DARSHAN_FORWARD_DECL(PMPI_Type_commit, int, (MPI_Datatype *datatype));
DARSHAN_FORWARD_DECL(PMPI_Type_contiguous, int, (int count, MPI_Datatype oldtype, MPI_Datatype *newtype));
DARSHAN_FORWARD_DECL(PMPI_Type_extent, int, (MPI_Datatype datatype, MPI_Aint *extent));
DARSHAN_FORWARD_DECL(PMPI_Type_free, int, (MPI_Datatype *datatype));
DARSHAN_FORWARD_DECL(PMPI_Type_hindexed, int, (int count, int *array_of_blocklengths, MPI_Aint *array_of_displacements, MPI_Datatype oldtype, MPI_Datatype *newtype));
DARSHAN_FORWARD_DECL(PMPI_Op_create, int, (MPI_User_function *function, int commute, MPI_Op *op));
DARSHAN_FORWARD_DECL(PMPI_Reduce, int, (void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm));
DARSHAN_FORWARD_DECL(PMPI_Type_get_envelope, int, (MPI_Datatype datatype, int *num_integers, int *num_addresses, int *num_datatypes, int *combiner));
DARSHAN_FORWARD_DECL(PMPI_Type_size, int, (MPI_Datatype datatype, int *size));

void resolve_mpi_symbols (void)
{
    /*
     * Overloaded functions
     */
    MAP_OR_FAIL(PMPI_File_close);
    MAP_OR_FAIL(PMPI_File_set_size);
    MAP_OR_FAIL(PMPI_File_iread_at);
    MAP_OR_FAIL(PMPI_File_iread);
    MAP_OR_FAIL(PMPI_File_iread_shared);
    MAP_OR_FAIL(PMPI_File_iwrite_at);
    MAP_OR_FAIL(PMPI_File_iwrite);
    MAP_OR_FAIL(PMPI_File_iwrite_shared);
    MAP_OR_FAIL(PMPI_File_open);
    MAP_OR_FAIL(PMPI_File_read_all_begin);
    MAP_OR_FAIL(PMPI_File_read_all);
    MAP_OR_FAIL(PMPI_File_read_at_all_begin);
    MAP_OR_FAIL(PMPI_File_read_at_all);
    MAP_OR_FAIL(PMPI_File_read_at);
    MAP_OR_FAIL(PMPI_File_read);
    MAP_OR_FAIL(PMPI_File_read_ordered_begin);
    MAP_OR_FAIL(PMPI_File_read_ordered);
    MAP_OR_FAIL(PMPI_File_read_shared);
    MAP_OR_FAIL(PMPI_File_set_view);
    MAP_OR_FAIL(PMPI_File_sync);
    MAP_OR_FAIL(PMPI_File_write_all_begin);
    MAP_OR_FAIL(PMPI_File_write_all);
    MAP_OR_FAIL(PMPI_File_write_at_all_begin);
    MAP_OR_FAIL(PMPI_File_write_at_all);
    MAP_OR_FAIL(PMPI_File_write_at);
    MAP_OR_FAIL(PMPI_File_write);
    MAP_OR_FAIL(PMPI_File_write_ordered_begin);
    MAP_OR_FAIL(PMPI_File_write_ordered);
    MAP_OR_FAIL(PMPI_File_write_shared);
    MAP_OR_FAIL(PMPI_Finalize);
    MAP_OR_FAIL(PMPI_Init);
    MAP_OR_FAIL(PMPI_Init_thread);

    /*
     * These function are not intercepted but are used
     * by darshan itself.
     */
    MAP_OR_FAIL(PMPI_Wtime);
    MAP_OR_FAIL(PMPI_Allreduce);
    MAP_OR_FAIL(PMPI_Bcast);
    MAP_OR_FAIL(PMPI_Comm_rank);
    MAP_OR_FAIL(PMPI_Comm_size);
    MAP_OR_FAIL(PMPI_Scan);
    MAP_OR_FAIL(PMPI_Type_commit);
    MAP_OR_FAIL(PMPI_Type_contiguous);
    MAP_OR_FAIL(PMPI_Type_extent);
    MAP_OR_FAIL(PMPI_Type_free);
    MAP_OR_FAIL(PMPI_Type_size);
    MAP_OR_FAIL(PMPI_Type_hindexed);
    MAP_OR_FAIL(PMPI_Op_create);
    MAP_OR_FAIL(PMPI_Reduce);
    MAP_OR_FAIL(PMPI_Type_get_envelope);

    return;
}

#else

#define DARSHAN_MPI_CALL(func) func

#endif

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extern char* __progname;

/* maximum number of memory segments each process will write to the log */
#define CP_MAX_MEM_SEGMENTS 8

#define CP_DATATYPE_INC(__file, __datatype) do {\
    int num_integers, num_addresses, num_datatypes, combiner, ret; \
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    ret = DARSHAN_MPI_CALL(PMPI_Type_get_envelope)(__datatype, &num_integers, \
        &num_addresses, &num_datatypes, &combiner); \
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    if(ret == MPI_SUCCESS) { \
        switch(combiner) { \
            case MPI_COMBINER_NAMED:\
                CP_INC(__file,CP_COMBINER_NAMED,1); break; \
            case MPI_COMBINER_DUP:\
                CP_INC(__file,CP_COMBINER_DUP,1); break; \
            case MPI_COMBINER_CONTIGUOUS:\
                CP_INC(__file,CP_COMBINER_CONTIGUOUS,1); break; \
            case MPI_COMBINER_VECTOR:\
                CP_INC(__file,CP_COMBINER_VECTOR,1); break; \
            case MPI_COMBINER_HVECTOR_INTEGER:\
                CP_INC(__file,CP_COMBINER_HVECTOR_INTEGER,1); break; \
            case MPI_COMBINER_HVECTOR:\
                CP_INC(__file,CP_COMBINER_HVECTOR,1); break; \
            case MPI_COMBINER_INDEXED:\
                CP_INC(__file,CP_COMBINER_INDEXED,1); break; \
            case MPI_COMBINER_HINDEXED_INTEGER:\
                CP_INC(__file,CP_COMBINER_HINDEXED_INTEGER,1); break; \
            case MPI_COMBINER_HINDEXED:\
                CP_INC(__file,CP_COMBINER_HINDEXED,1); break; \
            case MPI_COMBINER_INDEXED_BLOCK:\
                CP_INC(__file,CP_COMBINER_INDEXED_BLOCK,1); break; \
            case MPI_COMBINER_STRUCT_INTEGER:\
                CP_INC(__file,CP_COMBINER_STRUCT_INTEGER,1); break; \
            case MPI_COMBINER_STRUCT:\
                CP_INC(__file,CP_COMBINER_STRUCT,1); break; \
            case MPI_COMBINER_SUBARRAY:\
                CP_INC(__file,CP_COMBINER_SUBARRAY,1); break; \
            case MPI_COMBINER_DARRAY:\
                CP_INC(__file,CP_COMBINER_DARRAY,1); break; \
            case MPI_COMBINER_F90_REAL:\
                CP_INC(__file,CP_COMBINER_F90_REAL,1); break; \
            case MPI_COMBINER_F90_COMPLEX:\
                CP_INC(__file,CP_COMBINER_F90_COMPLEX,1); break; \
            case MPI_COMBINER_F90_INTEGER:\
                CP_INC(__file,CP_COMBINER_F90_INTEGER,1); break; \
            case MPI_COMBINER_RESIZED:\
                CP_INC(__file,CP_COMBINER_RESIZED,1); break; \
        } \
    } \
} while(0)

#define CP_RECORD_MPI_WRITE(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
    struct darshan_file_runtime* file; \
    int size = 0; \
    MPI_Aint extent = 0; \
    if(__ret != MPI_SUCCESS) break; \
    file = darshan_file_by_fh(__fh); \
    if(!file) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
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    size = size * __count; \
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    DARSHAN_MPI_CALL(PMPI_Type_extent)(__datatype, &extent); \
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    CP_BUCKET_INC(file, CP_SIZE_WRITE_AGG_0_100, size); \
    CP_BUCKET_INC(file, CP_EXTENT_WRITE_0_100, extent); \
    CP_INC(file, __counter, 1); \
    CP_DATATYPE_INC(file, __datatype); \
    CP_F_INC(file, CP_F_MPI_WRITE_TIME, (__tm2-__tm1)); \
    if(CP_F_VALUE(file, CP_F_WRITE_START_TIMESTAMP) == 0) \
        CP_F_SET(file, CP_F_WRITE_START_TIMESTAMP, __tm1); \
    CP_F_SET(file, CP_F_WRITE_END_TIMESTAMP, __tm2); \
} while(0)

#define CP_RECORD_MPI_READ(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
    struct darshan_file_runtime* file; \
    int size = 0; \
    MPI_Aint extent = 0; \
    if(__ret != MPI_SUCCESS) break; \
    file = darshan_file_by_fh(__fh); \
    if(!file) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
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    size = size * __count; \
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    DARSHAN_MPI_CALL(PMPI_Type_extent)(__datatype, &extent); \
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    CP_BUCKET_INC(file, CP_SIZE_READ_AGG_0_100, size); \
    CP_BUCKET_INC(file, CP_EXTENT_READ_0_100, extent); \
    CP_INC(file, __counter, 1); \
    CP_DATATYPE_INC(file, __datatype); \
    CP_F_INC(file, CP_F_MPI_READ_TIME, (__tm2-__tm1)); \
    if(CP_F_VALUE(file, CP_F_READ_START_TIMESTAMP) == 0) \
        CP_F_SET(file, CP_F_READ_START_TIMESTAMP, __tm1); \
    CP_F_SET(file, CP_F_READ_END_TIMESTAMP, __tm2); \
} while(0)

static struct darshan_file_runtime* darshan_file_by_fh(MPI_File fh);
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static void cp_log_construct_indices(struct darshan_job_runtime* final_job,
    int rank, int* inout_count, int* lengths, void** pointers, char*
    trailing_data);
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static int cp_log_write(struct darshan_job_runtime* final_job, int rank, 
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    char* logfile_name, int count, int* lengths, void** pointers, double start_log_time);
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static int cp_log_reduction(struct darshan_job_runtime* final_job, int rank, 
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    char* logfile_name, MPI_Offset* next_offset);
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static void darshan_file_reduce(void* infile_v, 
    void* inoutfile_v, int *len, 
    MPI_Datatype *datatype);
static int cp_log_compress(struct darshan_job_runtime* final_job,
    int rank, int* inout_count, int* lengths, void** pointers);
static int file_compare(const void* a, const void* b);
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static void darshan_mpi_initialize(int *argc, char ***argv);
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static char*  darshan_get_exe_and_mounts(struct darshan_job_runtime* final_job);
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static int darshan_file_variance(
    struct darshan_file *infile_array,
    struct darshan_file *outfile_array,
    int count, int rank);
static void pairwise_variance_reduce (
    void *invec, void *inoutvec, int *len, MPI_Datatype *dt);

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#define CP_MAX_MNTS 32
uint64_t mnt_hash_array[CP_MAX_MNTS] = {0};
int64_t mnt_id_array[CP_MAX_MNTS] = {0};
uint64_t mnt_hash_array_root[CP_MAX_MNTS] = {0};
int64_t mnt_id_array_root[CP_MAX_MNTS] = {0};
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struct
{
    int64_t mnt_id_local;
    int64_t mnt_id_root;
} mnt_mapping[CP_MAX_MNTS];
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struct variance_dt
{
    double n;
    double T;
    double S;
};

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int MPI_Init(int *argc, char ***argv)
{
    int ret;

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#ifdef DARSHAN_PRELOAD
    resolve_mpi_symbols();
#endif

    ret = DARSHAN_MPI_CALL(PMPI_Init)(argc, argv);
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    if(ret != MPI_SUCCESS)
    {
        return(ret);
    }

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    darshan_mpi_initialize(argc, argv);

    return(ret);
}

int MPI_Init_thread (int *argc, char ***argv, int required, int *provided)
{
    int ret;

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    ret = DARSHAN_MPI_CALL(PMPI_Init_thread)(argc, argv, required, provided);
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    if (ret != MPI_SUCCESS)
    {
        return(ret);
    }

    darshan_mpi_initialize(argc, argv);

    return(ret);
}

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static void darshan_mpi_initialize(int *argc, char ***argv)
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{
    int nprocs;
    int rank;

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    DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &rank);
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    CP_LOCK();
    if(argc && argv)
    {
        darshan_initialize(*argc, *argv, nprocs, rank);
    }
    else
    {
        /* we don't see argc and argv here in fortran */
        darshan_initialize(0, NULL, nprocs, rank);
    }

    CP_UNLOCK();

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    return;
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}

void darshan_shutdown(int timing_flag)
{
    int rank;
    char* logfile_name;
    struct darshan_job_runtime* final_job;
    double start_log_time = 0;
    int flags;
    int all_ret = 0;
    int local_ret = 0;
    MPI_Offset next_offset = 0;
    char* jobid_str;
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    char* envjobid;
    char* logpath;
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    int jobid;
    int index_count = 0;
    int lengths[CP_MAX_MEM_SEGMENTS];
    void* pointers[CP_MAX_MEM_SEGMENTS];
    int ret;
    double red1=0, red2=0, gz1=0, gz2=0, write1=0, write2=0, tm_end=0;
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    double bcst1=0, bcst2=0, bcst3=0;
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    int nprocs;
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    char* trailing_data = NULL;
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    int i, j;
    int map_index = 0;
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    time_t start_time_tmp = 0;
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    uint64_t logmod;
    char hname[HOST_NAME_MAX];
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    CP_LOCK();
    if(!darshan_global_job)
    {
        CP_UNLOCK();
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        return;
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    }
    /* disable further tracing while hanging onto the data so that we can
     * write it out
     */
    final_job = darshan_global_job;
    darshan_global_job = NULL;
    flags = final_job->flags;
    CP_UNLOCK();

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    start_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
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    /* figure out which access sizes to log */
    darshan_walk_file_accesses(final_job);

    /* if the records have been condensed, then zero out fields that are no
     * longer valid for safety 
     */
    if(final_job->flags & CP_FLAG_CONDENSED && final_job->file_count)
    {
        CP_SET(&final_job->file_runtime_array[0], CP_MODE, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_CONSEC_READS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_CONSEC_WRITES, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_SEQ_READS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_SEQ_WRITES, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE1_STRIDE, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE2_STRIDE, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE3_STRIDE, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE4_STRIDE, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE1_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE2_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE3_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_STRIDE4_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS1_ACCESS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS2_ACCESS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS3_ACCESS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS4_ACCESS, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS1_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS2_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS3_COUNT, 0);
        CP_SET(&final_job->file_runtime_array[0], CP_ACCESS4_COUNT, 0);
        
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_OPEN_TIMESTAMP, 0);
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_CLOSE_TIMESTAMP, 0);
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_READ_START_TIMESTAMP, 0);
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_READ_END_TIMESTAMP, 0);
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_WRITE_START_TIMESTAMP, 0);
        CP_F_SET(&final_job->file_runtime_array[0], CP_F_WRITE_END_TIMESTAMP, 0);
    }

    logfile_name = malloc(PATH_MAX);
    if(!logfile_name)
    {
        darshan_finalize(final_job);
        return;
    }

441
    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &rank);
442

443
    /* collect information about command line and 
444 445
     * mounted file systems 
     */
446 447 448 449
    trailing_data = darshan_get_exe_and_mounts(final_job);

    /* broadcast mount point information from root */
    if(rank == 0)
450
    {
451 452 453 454
        memcpy(mnt_hash_array_root, mnt_hash_array,
            CP_MAX_MNTS*sizeof(uint64_t));
        memcpy(mnt_id_array_root, mnt_id_array,
            CP_MAX_MNTS*sizeof(int64_t));
455
    }
456

457 458 459 460 461 462
    bcst1=DARSHAN_MPI_CALL(PMPI_Wtime)();
    DARSHAN_MPI_CALL(PMPI_Bcast)(mnt_id_array_root,
        CP_MAX_MNTS*sizeof(int64_t), MPI_BYTE, 0, MPI_COMM_WORLD);
    DARSHAN_MPI_CALL(PMPI_Bcast)(mnt_hash_array_root,
        CP_MAX_MNTS*sizeof(uint64_t), MPI_BYTE, 0, MPI_COMM_WORLD);
    bcst2=DARSHAN_MPI_CALL(PMPI_Wtime)();
463

464 465 466 467 468 469 470 471 472 473 474 475
    /* identify any common mount points that have different device ids on
     * non-root processes
     */
    for(i=0; (i<CP_MAX_MNTS && mnt_hash_array_root[i] != 0); i++)
    {
        for(j=0; (j<CP_MAX_MNTS && mnt_hash_array[j] != 0); j++)
        {
            if(mnt_hash_array_root[i] == mnt_hash_array[j])
            {
                /* found a shared mount point */
                if(mnt_id_array_root[i] != mnt_id_array[j])
                {
476 477 478 479 480 481
                    /* mismatching ids; record correct mapping */
                    mnt_mapping[map_index].mnt_id_local =
                        mnt_id_array[j];
                    mnt_mapping[map_index].mnt_id_root = 
                        mnt_id_array_root[i];
                    map_index++;
482 483 484 485 486
                }
                break;
            }
        }
    }
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
 
    /* adjust affected file records */
    for(i=0; (i<final_job->file_count && map_index > 0); i++)
    {
        for(j=0; j<map_index; j++)
        {
            if(final_job->file_array[i].counters[CP_DEVICE] ==
                mnt_mapping[j].mnt_id_local)
            {
                final_job->file_array[i].counters[CP_DEVICE] =  
                    mnt_mapping[j].mnt_id_root;
                break;
            }
        }
    }
   
503 504 505 506 507 508
    /* construct log file name */
    if(rank == 0)
    {
        char cuser[L_cuserid] = {0};
        struct tm* my_tm;

509 510 511 512 513 514 515 516 517 518 519 520 521 522
        /* Use CP_JOBID_OVERRIDE for the env var or CP_JOBID */
        envjobid = getenv(CP_JOBID_OVERRIDE);
        if (!envjobid)
        {
            envjobid = CP_JOBID;
        }

        /* Use CP_LOG_PATH_OVERRIDE for the value or __CP_LOG_PATH */
        logpath = getenv(CP_LOG_PATH_OVERRIDE);
        if (!logpath)
        {
            logpath = __CP_LOG_PATH;
        }

523
        /* find a job id */
524
        jobid_str = getenv(envjobid);
525 526 527 528 529 530 531 532 533 534 535 536
        if(jobid_str)
        {
            /* in cobalt we can find it in env var */
            ret = sscanf(jobid_str, "%d", &jobid);
        }
        if(!jobid_str || ret != 1)
        {
            /* use pid as fall back */
            jobid = getpid();
        }

        /* break out time into something human readable */
537 538
        start_time_tmp += final_job->log_job.start_time;
        my_tm = localtime(&start_time_tmp);
539 540 541 542

        /* note: getpwuid() causes link errors for static binaries */
        cuserid(cuser);

543 544 545 546
        /* generate a random number to help differentiate the log */
        (void) gethostname(hname, sizeof(hname));
        logmod = darshan_hash((void*)hname,strlen(hname),0);

547
        ret = snprintf(logfile_name, PATH_MAX, 
548
            "%s/%d/%d/%d/%s_%s_id%d_%d-%d-%d-%llu.darshan_partial",
549
            logpath, (my_tm->tm_year+1900), 
550
            (my_tm->tm_mon+1), my_tm->tm_mday, 
551 552 553
            cuser, __progname, jobid,
            (my_tm->tm_mon+1), 
            my_tm->tm_mday, 
554 555
            (my_tm->tm_hour*60*60 + my_tm->tm_min*60 + my_tm->tm_sec),
            llu(logmod));
556 557 558 559 560
        if(ret == (PATH_MAX-1))
        {
            /* file name was too big; squish it down */
            snprintf(logfile_name, PATH_MAX,
                "%s/id%d.darshan_partial",
561
                logpath, jobid);
562
        }
563 564 565

        /* add jobid */
        final_job->log_job.jobid = (int64_t)jobid;
566 567 568
    }

    /* broadcast log file name */
569 570 571
    bcst3=DARSHAN_MPI_CALL(PMPI_Wtime)();
    DARSHAN_MPI_CALL(PMPI_Bcast)(logfile_name, PATH_MAX, MPI_CHAR, 0,
        MPI_COMM_WORLD);
572 573 574 575 576

    final_job->log_job.end_time = time(NULL);

    /* reduce records for shared files */
    if(timing_flag)
577
        red1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
578 579
    local_ret = cp_log_reduction(final_job, rank, logfile_name, 
        &next_offset);
580
    if(timing_flag)
581 582
        red2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
    DARSHAN_MPI_CALL(PMPI_Allreduce)(&local_ret, &all_ret, 1, MPI_INT, MPI_LOR, 
583 584 585 586 587 588
        MPI_COMM_WORLD);

    if(all_ret == 0)
    {
        /* collect data to write from local process */
        cp_log_construct_indices(final_job, rank, &index_count, lengths, 
589
            pointers, trailing_data);
590 591 592 593 594 595
    }

    if(all_ret == 0)
    {
        /* compress data */
        if(timing_flag)
596
            gz1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
597 598 599
        local_ret = cp_log_compress(final_job, rank, &index_count, 
            lengths, pointers);
        if(timing_flag)
600 601 602
            gz2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&local_ret, &all_ret, 1,
            MPI_INT, MPI_LOR, MPI_COMM_WORLD);
603 604 605 606 607 608
    }

    if(all_ret == 0)
    {
        /* actually write out log file */
        if(timing_flag)
609
            write1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
610
        local_ret = cp_log_write(final_job, rank, logfile_name, 
611 612
            index_count, lengths, pointers, start_log_time);
        if(timing_flag)
613 614 615
            write2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&local_ret, &all_ret, 1,
            MPI_INT, MPI_LOR, MPI_COMM_WORLD);
616 617 618 619 620 621 622 623 624 625
    }

    /* if any process failed to write log, then delete the whole file so we
     * don't leave corrupted results
     */
    if(all_ret != 0 && rank == 0)
    {
        unlink(logfile_name);
    }

626 627
    if(trailing_data)
        free(trailing_data);
628 629 630 631 632 633 634 635 636
    free(logfile_name);
    darshan_finalize(final_job);
    
    if(timing_flag)
    {
        double red_tm, red_slowest;
        double gz_tm, gz_slowest;
        double write_tm, write_slowest;
        double all_tm, all_slowest;
637
        double bcst_tm, bcst_slowest;
638
        
639
        tm_end = DARSHAN_MPI_CALL(PMPI_Wtime)();
640

641
        bcst_tm=(bcst2-bcst1)+(red1-bcst3);
642 643 644 645 646
        red_tm = red2-red1;
        gz_tm = gz2-gz1;
        write_tm = write2-write1;
        all_tm = tm_end-start_log_time;

647
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&red_tm, &red_slowest, 1,
648
            MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD);
649
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&gz_tm, &gz_slowest, 1,
650
            MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD);
651
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&write_tm, &write_slowest, 1,
652
            MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD);
653
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&all_tm, &all_slowest, 1,
654
            MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD);
655
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&bcst_tm, &bcst_slowest, 1,
656
            MPI_DOUBLE, MPI_MAX, MPI_COMM_WORLD);
657 658 659

        if(rank == 0)
        {
660
            DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
661
            printf("#<op>\t<nprocs>\t<time>\n");
662
            printf("bcst\t%d\t%f\n", nprocs, bcst_slowest);
663 664 665 666 667 668 669 670 671 672 673 674 675 676
            printf("reduce\t%d\t%f\n", nprocs, red_slowest);
            printf("gzip\t%d\t%f\n", nprocs, gz_slowest);
            printf("write\t%d\t%f\n", nprocs, write_slowest);
            printf("all\t%d\t%f\n", nprocs, all_slowest);
        }
    }

    return;
}

int MPI_Finalize(void)
{
    int ret;

677 678 679 680
    if(getenv("DARSHAN_INTERNAL_TIMING"))
        darshan_shutdown(1);
    else
        darshan_shutdown(0);
681

682
    ret = DARSHAN_MPI_CALL(PMPI_Finalize)();
683 684 685 686 687 688 689 690 691 692 693 694 695 696
    return(ret);
}

int MPI_File_open(MPI_Comm comm, char *filename, int amode, MPI_Info info, MPI_File *fh) 
{
    int ret;
    struct darshan_file_runtime* file;
    char* tmp;
    int comm_size;
    int hash_index;
    uint64_t tmp_hash;
    double tm1, tm2;

    tm1 = darshan_wtime();
697
    ret = DARSHAN_MPI_CALL(PMPI_File_open)(comm, filename, amode, info, fh);
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
    tm2 = darshan_wtime();

    if(ret == MPI_SUCCESS)
    {
        CP_LOCK();

        /* use ROMIO approach to strip prefix if present */
        /* strip off prefix if there is one, but only skip prefixes
         * if they are greater than length one to allow for windows
         * drive specifications (e.g. c:\...) 
         */
        tmp = strchr(filename, ':');
        if (tmp > filename + 1) {
            filename = tmp + 1;
        }

        file = darshan_file_by_name(filename);
        /* TODO: handle the case of multiple concurrent opens */
        if(file && (file->fh == MPI_FILE_NULL))
        {
            file->fh = *fh;
            CP_SET(file, CP_MODE, amode);
            CP_F_INC(file, CP_F_MPI_META_TIME, (tm2-tm1));
            if(CP_F_VALUE(file, CP_F_OPEN_TIMESTAMP) == 0)
722 723 724
                CP_F_SET(file, CP_F_OPEN_TIMESTAMP,
                DARSHAN_MPI_CALL(PMPI_Wtime)());
            DARSHAN_MPI_CALL(PMPI_Comm_size)(comm, &comm_size);
725 726 727 728 729 730 731 732 733 734 735 736
            if(comm_size == 1)
            {
                CP_INC(file, CP_INDEP_OPENS, 1);
            }
            else
            {
                CP_INC(file, CP_COLL_OPENS, 1);
            }
            if(info != MPI_INFO_NULL)
            {
                CP_INC(file, CP_HINTS, 1);
            }
737
            tmp_hash = darshan_hash((void*)fh, sizeof(*fh), 0);
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
            hash_index = tmp_hash & CP_HASH_MASK;
            file->fh_prev = NULL;
            file->fh_next = darshan_global_job->fh_table[hash_index];
            if(file->fh_next)
                file->fh_next->fh_prev = file;
            darshan_global_job->fh_table[hash_index] = file;
        }
        CP_UNLOCK();
    }

    return(ret);
}

int MPI_File_close(MPI_File *fh) 
{
    int hash_index;
    uint64_t tmp_hash;
    struct darshan_file_runtime* file;
    MPI_File tmp_fh = *fh;
    double tm1, tm2;
    int ret;
    
    tm1 = darshan_wtime();
761
    ret = DARSHAN_MPI_CALL(PMPI_File_close)(fh);
762 763 764 765 766 767 768
    tm2 = darshan_wtime();

    CP_LOCK();
    file = darshan_file_by_fh(tmp_fh);
    if(file)
    {
        file->fh = MPI_FILE_NULL;
769
        CP_F_SET(file, CP_F_CLOSE_TIMESTAMP, DARSHAN_MPI_CALL(PMPI_Wtime)());
770 771 772 773
        CP_F_INC(file, CP_F_MPI_META_TIME, (tm2-tm1));
        if(file->fh_prev == NULL)
        {
            /* head of fh hash table list */
774
            tmp_hash = darshan_hash((void*)&tmp_fh, sizeof(tmp_fh), 0);
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
            hash_index = tmp_hash & CP_HASH_MASK;
            darshan_global_job->fh_table[hash_index] = file->fh_next;
            if(file->fh_next)
                file->fh_next->fh_prev = NULL;
        }
        else
        {
            if(file->fh_prev)
                file->fh_prev->fh_next = file->fh_next;
            if(file->fh_next)
                file->fh_next->fh_prev = file->fh_prev;
        }
        file->fh_prev = NULL;
        file->fh_next = NULL;
        darshan_global_job->darshan_mru_file = file; /* in case we open it again, or hit posix calls */
    }
    CP_UNLOCK();

    return(ret);
}

int MPI_File_sync(MPI_File fh)
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

    tm1 = darshan_wtime();
803
    ret = DARSHAN_MPI_CALL(PMPI_File_sync)(fh);
804 805 806 807 808 809 810
    tm2 = darshan_wtime();
    if(ret == MPI_SUCCESS)
    {
        CP_LOCK();
        file = darshan_file_by_fh(fh);
        if(file)
        {
811
            CP_F_INC(file, CP_F_MPI_WRITE_TIME, (tm2-tm1));
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828
            CP_INC(file, CP_SYNCS, 1);
        }
        CP_UNLOCK();
    }

    return(ret);
}


int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype, 
    MPI_Datatype filetype, char *datarep, MPI_Info info)
{
    int ret;
    struct darshan_file_runtime* file;
    double tm1, tm2;

    tm1 = darshan_wtime();
829 830
    ret = DARSHAN_MPI_CALL(PMPI_File_set_view)(fh, disp, etype,
        filetype, datarep, info);
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858
    tm2 = darshan_wtime();
    if(ret == MPI_SUCCESS)
    {
        CP_LOCK();
        file = darshan_file_by_fh(fh);
        if(file)
        {
            CP_INC(file, CP_VIEWS, 1);
            if(info != MPI_INFO_NULL)
            {
                CP_F_INC(file, CP_F_MPI_META_TIME, (tm2-tm1));
                CP_INC(file, CP_HINTS, 1);
            }
            CP_DATATYPE_INC(file, filetype);
        }
        CP_UNLOCK();
    }

    return(ret);
}

int MPI_File_read(MPI_File fh, void *buf, int count, 
    MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
859
    ret = DARSHAN_MPI_CALL(PMPI_File_read)(fh, buf, count, datatype, status);
860 861 862 863 864 865 866 867 868 869 870 871 872 873
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_INDEP_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
874 875
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at)(fh, offset, buf,
        count, datatype, status);
876 877 878 879 880 881 882 883 884 885 886 887 888 889
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_INDEP_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_at_all(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
890 891
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all)(fh, offset, buf,
        count, datatype, status);
892 893 894 895 896 897 898 899 900 901 902 903 904
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_COLL_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_all(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
905 906
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all)(fh, buf, count,
        datatype, status);
907 908 909 910 911 912 913 914 915 916 917 918 919
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_COLL_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_shared(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
920 921
    ret = DARSHAN_MPI_CALL(PMPI_File_read_shared)(fh, buf, count,
        datatype, status);
922 923 924 925 926 927 928 929 930 931 932 933 934 935
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_INDEP_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_ordered(MPI_File fh, void * buf, int count, 
    MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
936 937
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered)(fh, buf, count,
        datatype, status);
938 939 940 941 942 943 944 945 946 947 948 949 950 951
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_COLL_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_at_all_begin(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
952 953
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all_begin)(fh, offset, buf,
        count, datatype);
954 955 956 957 958 959 960 961 962 963 964 965 966
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_SPLIT_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_all_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
967
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all_begin)(fh, buf, count, datatype);
968 969 970 971 972 973 974 975 976 977 978 979 980
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_SPLIT_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_read_ordered_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
981 982
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered_begin)(fh, buf, count,
        datatype);
983 984 985 986 987 988 989 990 991 992 993 994 995 996
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_SPLIT_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iread_at(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPIO_Request *request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
997 998
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_at)(fh, offset, buf, count,
        datatype, request);
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_NB_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iread(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPIO_Request * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1012
    ret = DARSHAN_MPI_CALL(PMPI_File_iread)(fh, buf, count, datatype, request);
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_NB_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iread_shared(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, MPIO_Request * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1027 1028
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_shared)(fh, buf, count,
        datatype, request);
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_READ(ret, fh, count, datatype, CP_NB_READS, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}


int MPI_File_write(MPI_File fh, void *buf, int count, 
    MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1044
    ret = DARSHAN_MPI_CALL(PMPI_File_write)(fh, buf, count, datatype, status);
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_INDEP_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_at(MPI_File fh, MPI_Offset offset, void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1059 1060
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(fh, offset, buf,
        count, datatype, status);
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_INDEP_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1075 1076
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all)(fh, offset, buf,
        count, datatype, status);
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_COLL_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_all(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1090 1091
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all)(fh, buf, count,
        datatype, status);
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_COLL_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_shared(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1105 1106
    ret = DARSHAN_MPI_CALL(PMPI_File_write_shared)(fh, buf, count,
        datatype, status);
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_INDEP_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_ordered(MPI_File fh, void * buf, int count, 
    MPI_Datatype datatype, MPI_Status * status)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1121 1122
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered)(fh, buf, count,
         datatype, status);
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_COLL_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1137 1138
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all_begin)(fh, offset,
        buf, count, datatype);
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_SPLIT_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_all_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1152
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all_begin)(fh, buf, count, datatype);
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_SPLIT_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_write_ordered_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1166 1167
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered_begin)(fh, buf, count,
        datatype);
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_SPLIT_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPIO_Request *request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1182 1183
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_at)(fh, offset, buf,
        count, datatype, request);
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_NB_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iwrite(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPIO_Request * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1197
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite)(fh, buf, count, datatype, request);
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_NB_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

int MPI_File_iwrite_shared(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, MPIO_Request * request)
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_wtime();
1212 1213
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_shared)(fh, buf, count,
        datatype, request);
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
    tm2 = darshan_wtime();
    CP_LOCK();
    CP_RECORD_MPI_WRITE(ret, fh, count, datatype, CP_NB_WRITES, tm1, tm2);
    CP_UNLOCK();
    return(ret);
}

static struct darshan_file_runtime* darshan_file_by_fh(MPI_File fh)
{
    struct darshan_file_runtime* tmp_file;
    uint64_t tmp_hash = 0;
    int hash_index;

    if(!darshan_global_job)
        return(NULL);

    /* if we have already condensed the data, then just hand the first file
     * back
     */
    if(darshan_global_job->flags & CP_FLAG_CONDENSED)
    {
        return(&darshan_global_job->file_runtime_array[0]);
    }

    /* check most recently used */
    if(darshan_global_job->darshan_mru_file && darshan_global_job->darshan_mru_file->fh == fh)
    {
        return(darshan_global_job->darshan_mru_file);
    }

1244
    tmp_hash = darshan_hash((void*)(&fh), sizeof(fh), 0);
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268

    /* search hash table */
    hash_index = tmp_hash & CP_HASH_MASK;
    tmp_file = darshan_global_job->fh_table[hash_index];
    while(tmp_file)
    {
        if(tmp_file->fh == fh)
        {
            darshan_global_job->darshan_mru_file = tmp_file;
            return(tmp_file);
        }
        tmp_file = tmp_file->fh_next;
    }

    return(NULL);
}

/* cp_log_reduction()
 *
 * Identify shared files and reduce them to one log entry
 *
 * returns 0 on success, -1 on failure
 */
static int cp_log_reduction(struct darshan_job_runtime* final_job, int rank, 
1269
    char* logfile_name, MPI_Offset* next_offset)
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
{
    /* TODO: these need to be allocated differently now, too big */
    uint64_t hash_array[CP_MAX_FILES] = {0};
    int mask_array[CP_MAX_FILES] = {0};
    int all_mask_array[CP_MAX_FILES] = {0};
    int ret;
    int i;
    int j;
    MPI_Op reduce_op;
    MPI_Datatype rtype;
    struct darshan_file* tmp_array = NULL;
    int shared_count = 0;

    /* register a reduction operation */
1284
    ret = DARSHAN_MPI_CALL(PMPI_Op_create)(darshan_file_reduce, 1, &reduce_op); 
1285 1286 1287 1288 1289 1290 1291 1292
    if(ret != 0)
    {
        return(-1);
    }

    /* construct a datatype for a file record.  This is serving no purpose
     * except to make sure we can do a reduction on proper boundaries
     */
1293 1294 1295
    DARSHAN_MPI_CALL(PMPI_Type_contiguous)(sizeof(struct darshan_file),
        MPI_BYTE, &rtype); 
    DARSHAN_MPI_CALL(PMPI_Type_commit)(&rtype); 
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306

    /* gather list of files that root process has opened */
    if(rank == 0)
    {
        for(i=0; i<final_job->file_count; i++)
        {
            hash_array[i] = final_job->file_array[i].hash;
        }
    }

    /* broadcast list of files to all other processes */
1307 1308
    ret = DARSHAN_MPI_CALL(PMPI_Bcast)(hash_array,
        (CP_MAX_FILES * sizeof(uint64_t)), 
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
        MPI_BYTE, 0, MPI_COMM_WORLD);
    if(ret != 0)
    {
        return(-1);
    }

    /* everyone looks to see if they have also opened that same file */
    for(i=0; (i<CP_MAX_FILES && hash_array[i] != 0); i++)
    {
        for(j=0; j<final_job->file_count; j++)
        {
            if(hash_array[i] && final_job->file_array[j].hash == hash_array[i])
            {
                /* we opened that file too */
                mask_array[i] = 1;
                break;
            }
        }
    }

    /* now allreduce so that everyone agrees on which files are shared */
1330 1331
    ret = DARSHAN_MPI_CALL(PMPI_Allreduce)(mask_array, all_mask_array,
        CP_MAX_FILES, MPI_INT, MPI_LAND, MPI_COMM_WORLD);
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
    if(ret != 0)
    {
        return(-1);
    }

    /* walk through mask array counting entries and marking corresponding
     * files with a rank of -1
     */
    for(i=0; i<CP_MAX_FILES; i++)
    {
        if(all_mask_array[i])
        {
            shared_count++;
            for(j=0; j<final_job->file_count; j++)
            {
                if(final_job->file_array[j].hash == hash_array[i])
                {
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373

                    /*
                     * Initialize fastest/slowest info prior
                     * to the reduction.
                     */
                    final_job->file_array[j].counters[CP_FASTEST_RANK] =
                      final_job->file_array[j].rank;
                    final_job->file_array[j].counters[CP_FASTEST_RANK_BYTES] =
                      final_job->file_array[j].counters[CP_BYTES_READ] +
                      final_job->file_array[j].counters[CP_BYTES_WRITTEN];
                    final_job->file_array[j].fcounters[CP_F_FASTEST_RANK_TIME] =
                      final_job->file_array[j].fcounters[CP_F_POSIX_META_TIME] +
                      final_job->file_array[j].fcounters[CP_F_POSIX_READ_TIME] +
                      final_job->file_array[j].fcounters[CP_F_POSIX_WRITE_TIME];

                    final_job->file_array[j].counters[CP_SLOWEST_RANK] =
                      final_job->file_array[j].rank;
                    final_job->file_array[j].counters[CP_SLOWEST_RANK_BYTES] =
                      final_job->file_array[j].counters[CP_BYTES_READ] +
                      final_job->file_array[j].counters[CP_BYTES_WRITTEN];
                    final_job->file_array[j].fcounters[CP_F_SLOWEST_RANK_TIME] =
                      final_job->file_array[j].fcounters[CP_F_POSIX_META_TIME] +
                      final_job->file_array[j].fcounters[CP_F_POSIX_READ_TIME] +
                      final_job->file_array[j].fcounters[CP_F_POSIX_WRITE_TIME];

1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
                    final_job->file_array[j].rank = -1;
                    break;
                }
            }
        }
    }

    if(shared_count)
    {
        if(rank == 0)
        {
            /* root proc needs to allocate memory to store reduction */
            tmp_array = malloc(shared_count*sizeof(struct darshan_file));
            if(!tmp_array)
            {
                /* TODO: think more about how to handle errors like this */
                return(-1);
            }
        }

        /* sort the array of files descending by rank so that we get all of the 
         * shared files (marked by rank -1) in a contiguous portion at end 
         * of the array
         */
        qsort(final_job->file_array, final_job->file_count, 
            sizeof(struct darshan_file), file_compare);

1401
        ret = DARSHAN_MPI_CALL(PMPI_Reduce)(
1402 1403 1404 1405 1406 1407 1408
            &final_job->file_array[final_job->file_count-shared_count], 
            tmp_array, shared_count, rtype, reduce_op, 0, MPI_COMM_WORLD);
        if(ret != 0)
        {
            return(-1);
        }

1409 1410 1411 1412 1413 1414 1415 1416
        ret = darshan_file_variance(
            &final_job->file_array[final_job->file_count-shared_count],
            tmp_array, shared_count, rank);
        if (ret)
        {
            return(-1);
        }

1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
        if(rank == 0)
        {
            /* root replaces local files with shared ones */
            memcpy(&final_job->file_array[final_job->file_count-shared_count],
                tmp_array, shared_count*sizeof(struct darshan_file));
            free(tmp_array);
            tmp_array = NULL;
        }
        else
        {
            /* everyone else simply discards those file records */
            final_job->file_count -= shared_count;
        }
    }
    
    return(0);
}

/* TODO: should we use more of the CP macros here? */
static void darshan_file_reduce(void* infile_v, 
    void* inoutfile_v, int *len, 
    MPI_Datatype *datatype)
{
    struct darshan_file tmp_file;
    struct darshan_file* infile = infile_v;
    struct darshan_file* inoutfile = inoutfile_v;
    struct darshan_file_runtime tmp_runtime;
    int i;
    int j;
    int k;

    for(i=0; i<*len; i++)
    {
        memset(&tmp_file, 0, sizeof(tmp_file));

        tmp_file.hash = infile->hash;
        tmp_file.rank = -1; /* indicates shared across all procs */

        /* sum */
        for(j=CP_INDEP_OPENS; j<=CP_VIEWS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + 
                inoutfile->counters[j];
        }

        /* pick one */
        tmp_file.counters[CP_MODE] = infile->counters[CP_MODE];


        /* sum */
        for(j=CP_BYTES_READ; j<=CP_BYTES_WRITTEN; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + 
                inoutfile->counters[j];
        }

        /* max */
        for(j=CP_MAX_BYTE_READ; j<=CP_MAX_BYTE_WRITTEN; j++)
        {
            tmp_file.counters[j] = (
                (infile->counters[j] > inoutfile->counters[j]) ? 
                infile->counters[j] :
                inoutfile->counters[j]);
        }

        /* sum */
        for(j=CP_CONSEC_READS; j<=CP_MEM_NOT_ALIGNED; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + 
                inoutfile->counters[j];
        }

        /* pick one */
        tmp_file.counters[CP_MEM_ALIGNMENT] = infile->counters[CP_MEM_ALIGNMENT];
        /* sum */
        for(j=CP_FILE_NOT_ALIGNED; j<=CP_FILE_NOT_ALIGNED; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + 
                inoutfile->counters[j];
        }

        /* pick one */
        tmp_file.counters[CP_FILE_ALIGNMENT] = infile->counters[CP_FILE_ALIGNMENT];
        
1501 1502
        /* skip CP_MAX_*_TIME_SIZE; handled in floating point section */

1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
        /* sum */
        for(j=CP_SIZE_READ_0_100; j<=CP_EXTENT_WRITE_1G_PLUS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + 
                inoutfile->counters[j];
        }

        /* pick the 4 most common strides out of the 8 we have to chose from */

        /* first collapse any duplicates */
        for(j=CP_STRIDE1_STRIDE; j<=CP_STRIDE4_STRIDE; j++)
        {
            for(k=CP_STRIDE1_STRIDE; k<=CP_STRIDE4_STRIDE; k++)
            {
                if(infile->counters[j] == inoutfile->counters[k])
                {
                    infile->counters[j+4] += inoutfile->counters[k+4];
                    inoutfile->counters[k] = 0;
                    inoutfile->counters[k+4] = 0;
                }
            }
        }

        /* placeholder so we can re-use macros */
        tmp_runtime.log_file = &tmp_file;
        /* first set */
        for(j=CP_STRIDE1_STRIDE; j<=CP_STRIDE4_STRIDE; j++)
        {
            CP_COUNTER_INC(&tmp_runtime, infile->counters[j],
                infile->counters[j+4], 1, CP_STRIDE1_STRIDE, CP_STRIDE1_COUNT);
        }
        /* second set */
        for(j=CP_STRIDE1_STRIDE; j<=CP_STRIDE4_STRIDE; j++)
        {
            CP_COUNTER_INC(&tmp_runtime, inoutfile->counters[j],
                inoutfile->counters[j+4], 1, CP_STRIDE1_STRIDE, CP_STRIDE1_COUNT);
        }

        /* TODO: subroutine so we don't duplicate so much */
        /* same for access counts */

        /* first collapse any duplicates */
        for(j=CP_ACCESS1_ACCESS; j<=CP_ACCESS4_ACCESS; j++)
        {
            for(k=CP_ACCESS1_ACCESS; k<=CP_ACCESS4_ACCESS; k++)
            {
                if(infile->counters[j] == inoutfile->counters[k])
                {
                    infile->counters[j+4] += inoutfile->counters[k+4];
                    inoutfile->counters[k] = 0;
                    inoutfile->counters[k+4] = 0;
                }
            }
        }

        /* placeholder so we can re-use macros */
        tmp_runtime.log_file = &tmp_file;
        /* first set */
        for(j=CP_ACCESS1_ACCESS; j<=CP_ACCESS4_ACCESS; j++)
        {
            CP_COUNTER_INC(&tmp_runtime, infile->counters[j],
                infile->counters[j+4], 1, CP_ACCESS1_ACCESS, CP_ACCESS1_COUNT);
        }
        /* second set */
        for(j=CP_ACCESS1_ACCESS; j<=CP_ACCESS4_ACCESS; j++)
        {
            CP_COUNTER_INC(&tmp_runtime, inoutfile->counters[j],
                inoutfile->counters[j+4], 1, CP_ACCESS1_ACCESS, CP_ACCESS1_COUNT);
        }

        /* min */
        for(j=CP_F_OPEN_TIMESTAMP; j<=CP_F_WRITE_START_TIMESTAMP; j++)
        {
            if(infile->fcounters[j] > inoutfile->fcounters[j])
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
            else
                tmp_file.fcounters[j] = infile->fcounters[j];
        }

        /* max */
        for(j=CP_F_CLOSE_TIMESTAMP; j<=CP_F_WRITE_END_TIMESTAMP; j++)
        {
            if(infile->fcounters[j] > inoutfile->fcounters[j])
                tmp_file.fcounters[j] = infile->fcounters[j];
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
        }

        /* sum */
        for(j=CP_F_POSIX_READ_TIME; j<=CP_F_MPI_WRITE_TIME; j++)
        {
            tmp_file.fcounters[j] = infile->fcounters[j] + 
                inoutfile->fcounters[j];
        }

1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630
        /* max (special case) */
        if(infile->fcounters[CP_F_MAX_WRITE_TIME] > 
            inoutfile->fcounters[CP_F_MAX_WRITE_TIME])
        {
            tmp_file.fcounters[CP_F_MAX_WRITE_TIME] = 
                infile->fcounters[CP_F_MAX_WRITE_TIME];
            tmp_file.counters[CP_MAX_WRITE_TIME_SIZE] = 
                infile->counters[CP_MAX_WRITE_TIME_SIZE];
        }
        else
        {
            tmp_file.fcounters[CP_F_MAX_WRITE_TIME] = 
                inoutfile->fcounters[CP_F_MAX_WRITE_TIME];
            tmp_file.counters[CP_MAX_WRITE_TIME_SIZE] = 
                inoutfile->counters[CP_MAX_WRITE_TIME_SIZE];
        }

        if(infile->fcounters[CP_F_MAX_READ_TIME] > 
            inoutfile->fcounters[CP_F_MAX_READ_TIME])
        {
            tmp_file.fcounters[CP_F_MAX_READ_TIME] = 
                infile->fcounters[CP_F_MAX_READ_TIME];
            tmp_file.counters[CP_MAX_READ_TIME_SIZE] = 
                infile->counters[CP_MAX_READ_TIME_SIZE];
        }
        else
        {
            tmp_file.fcounters[CP_F_MAX_READ_TIME] = 
                inoutfile->fcounters[CP_F_MAX_READ_TIME];
            tmp_file.counters[CP_MAX_READ_TIME_SIZE] = 
                inoutfile->counters[CP_MAX_READ_TIME_SIZE];
        }

1631
        /* min */
1632 1633
        if(infile->fcounters[CP_F_FASTEST_RANK_TIME] <
           inoutfile->fcounters[CP_F_FASTEST_RANK_TIME])
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
        {
            tmp_file.counters[CP_FASTEST_RANK] =
                infile->counters[CP_FASTEST_RANK];
            tmp_file.counters[CP_FASTEST_RANK_BYTES] = 
                infile->counters[CP_FASTEST_RANK_BYTES];
            tmp_file.fcounters[CP_F_FASTEST_RANK_TIME] =
                infile->fcounters[CP_F_FASTEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[CP_FASTEST_RANK] =
                inoutfile->counters[CP_FASTEST_RANK];
            tmp_file.counters[CP_FASTEST_RANK_BYTES] =
                inoutfile->counters[CP_FASTEST_RANK_BYTES];
            tmp_file.fcounters[CP_F_FASTEST_RANK_TIME] = 
                inoutfile->fcounters[CP_F_FASTEST_RANK_TIME];
        }

        /* max */
        if(infile->fcounters[CP_F_SLOWEST_RANK_TIME] >
           inoutfile->fcounters[CP_F_SLOWEST_RANK_TIME])
        {
            tmp_file.counters[CP_SLOWEST_RANK] =
                infile->counters[CP_SLOWEST_RANK];
            tmp_file.counters[CP_SLOWEST_RANK_BYTES] =
                infile->counters[CP_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[CP_F_SLOWEST_RANK_TIME] = 
                infile->fcounters[CP_F_SLOWEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[CP_SLOWEST_RANK] = 
                inoutfile->counters[CP_SLOWEST_RANK];
            tmp_file.counters[CP_SLOWEST_RANK_BYTES] = 
                inoutfile->counters[CP_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[CP_F_SLOWEST_RANK_TIME] = 
                inoutfile->fcounters[CP_F_SLOWEST_RANK_TIME];
        }

1673
        /* pick one device id and file size */
1674
        tmp_file.counters[CP_DEVICE] = infile->counters[CP_DEVICE];
1675
        tmp_file.counters[CP_SIZE_AT_OPEN] = infile->counters[CP_SIZE_AT_OPEN];
1676

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
        /* pick one name suffix */
        strcpy(tmp_file.name_suffix, infile->name_suffix);

        *inoutfile = tmp_file;
        inoutfile++;
        infile++;
    }
    
    return;
}
/* cp_log_construct_indices()
 *
 * create memory datatypes to describe the log data to write out
 */
static void cp_log_construct_indices(struct darshan_job_runtime* final_job, 
1692 1693
    int rank, int* inout_count, int* lengths, void** pointers, char*
    trailing_data)
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
{
    *inout_count = 0;

    if(rank == 0)
    {
        /* root process is responsible for writing header */
        lengths[*inout_count] = sizeof(final_job->log_job);
        pointers[*inout_count] = &final_job->log_job;
        (*inout_count)++;

        /* also string containing exe command line */
        lengths[*inout_count] = CP_EXE_LEN + 1; 
1706
        pointers[*inout_count] = trailing_data;
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
        (*inout_count)++;
    }

    /* everyone adds their own file records, if present */
    if(final_job->file_count > 0)
    {
        lengths[*inout_count] = final_job->file_count*CP_FILE_RECORD_SIZE;
        pointers[*inout_count] = final_job->file_array;
        (*inout_count)++;
    }
    
    return;
}

/* cp_log_write()
 *
 * actually write log information to disk
 */
static int cp_log_write(struct darshan_job_runtime* final_job, int rank, 
1726
    char* logfile_name, int count, int* lengths, void** pointers, double start_log_time)
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
{
    int ret;
    MPI_File fh;
    MPI_Status status;
    MPI_Datatype mtype;
    int my_total = 0;
    long my_total_long;
    long offset;
    int i;
    MPI_Aint displacements[CP_MAX_MEM_SEGMENTS];
    void* buf;
    int failed_write = 0;

    /* construct data type to describe everything we are writing */
    /* NOTE: there may be a bug in MPI-IO when using MPI_BOTTOM with an
     * hindexed data type.  We will instead use the first pointer as a base
     * and adjust the displacements relative to it.
     */
    buf = pointers[0];
    for(i=0; i<count; i++)
    {
        displacements[i] = (MPI_Aint)(pointers[i] - buf);
    }
1750 1751 1752
    DARSHAN_MPI_CALL(PMPI_Type_hindexed)(count, lengths, displacements,
        MPI_BYTE, &mtype);
    DARSHAN_MPI_CALL(PMPI_Type_commit)(&mtype); 
1753

1754 1755
    ret = DARSHAN_MPI_CALL(PMPI_File_open)(MPI_COMM_WORLD, logfile_name,
        MPI_MODE_CREATE | MPI_MODE_WRONLY | MPI_MODE_EXCL, MPI_INFO_NULL, &fh);
1756 1757
    if(ret != MPI_SUCCESS)
    {
1758
        /* TODO: keep this print or not? */
1759
        fprintf(stderr, "darshan library warning: unable to open log file %s\n", logfile_name);
1760
        DARSHAN_MPI_CALL(PMPI_Type_free)(&mtype);
1761 1762 1763
        return(-1);
    }
   
1764
    DARSHAN_MPI_CALL(PMPI_File_set_size)(fh, 0);
1765 1766

    /* figure out where everyone is writing */
1767
    DARSHAN_MPI_CALL(PMPI_Type_size)(mtype, &my_total);
1768
    my_total_long = my_total;
1769 1770
    DARSHAN_MPI_CALL(PMPI_Scan)(&my_total_long, &offset, 1,
        MPI_LONG, MPI_SUM, MPI_COMM_WORLD); 
1771 1772 1773 1774
    /* scan is inclusive; subtract local size back out */
    offset -= my_total_long;

    /* collectively write out file records from all processes */
1775
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all)(fh, offset, buf, 
1776 1777 1778 1779 1780 1781
        1, mtype, &status);
    if(ret != MPI_SUCCESS)
    {
        failed_write = 1;
    }

1782
    DARSHAN_MPI_CALL(PMPI_File_close)(&fh);
1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794

    /* rename from *.darshan_partial to *-<logwritetime>.darshan.gz */
    if(rank == 0)
    {
        char* mod_index;
        double end_log_time;
        char* new_logfile_name;

        new_logfile_name = malloc(PATH_MAX);
        if(new_logfile_name)
        {
            new_logfile_name[0] = '\0';
1795
            end_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
1796 1797 1798 1799
            strcat(new_logfile_name, logfile_name);
            mod_index = strstr(new_logfile_name, ".darshan_partial");
            sprintf(mod_index, "_%d.darshan.gz", (int)(end_log_time-start_log_time+1));
            rename(logfile_name, new_logfile_name);
1800 1801
            /* set permissions on log file */
            chmod(new_logfile_name, (S_IRUSR)); 
1802 1803 1804 1805
            free(new_logfile_name);
        }
    }

1806
    DARSHAN_MPI_CALL(PMPI_Type_free)(&mtype);
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950