darshan-mpiio.c 44.5 KB
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/*
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 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
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 */

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#define _XOPEN_SOURCE 500
#define _GNU_SOURCE

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#include "darshan-runtime-config.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <search.h>
#include <assert.h>
#include <pthread.h>

#include "darshan.h"
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#include "darshan-dynamic.h"
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/* The mpiio_file_record_ref structure maintains necessary runtime metadata
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 * for the MPIIO file record (darshan_mpiio_file structure, defined in
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 * darshan-mpiio-log-format.h) pointed to by 'file_rec'. This metadata
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 * assists with the instrumenting of specific statistics in the file record.
 *
 * RATIONALE: the MPIIO module needs to track some stateful, volatile 
 * information about each open file (like the current file offset, most recent 
 * access time, etc.) to aid in instrumentation, but this information can't be
 * stored in the darshan_mpiio_file struct because we don't want it to appear in
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 * the final darshan log file.  We therefore associate a mpiio_file_record_ref
 * struct with each darshan_mpiio_file struct in order to track this information
 * (i.e., the mapping between mpiio_file_record_ref structs to darshan_mpiio_file
 * structs is one-to-one).
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 *
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 * NOTE: we use the 'darshan_record_ref' interface (in darshan-common) to
 * associate different types of handles with this mpiio_file_record_ref struct.
 * This allows us to index this struct (and the underlying file record) by using
 * either the corresponding Darshan record identifier (derived from the filename)
 * or by a generated MPI file handle, for instance. So, while there should only
 * be a single Darshan record identifier that indexes a mpiio_file_record_ref,
 * there could be multiple open file handles that index it.
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 */
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struct mpiio_file_record_ref
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{
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    struct darshan_mpiio_file *file_rec;
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    enum darshan_io_type last_io_type;
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    double last_meta_end;
    double last_read_end;
    double last_write_end;
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    void *access_root;
    int access_count;
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};

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/* The mpiio_runtime structure maintains necessary state for storing
 * MPI-IO file records and for coordinating with darshan-core at 
 * shutdown time.
 */
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struct mpiio_runtime
{
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    void *rec_id_hash;
    void *fh_hash;
    int file_rec_count;
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};

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static void mpiio_runtime_initialize(
    void);
static struct mpiio_file_record_ref *mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path);
static void mpiio_finalize_file_records(
    void *rec_ref_p);
static void mpiio_record_reduction_op(
    void* infile_v, void* inoutfile_v, int *len, MPI_Datatype *datatype);
static void mpiio_shared_record_variance(
    MPI_Comm mod_comm, struct darshan_mpiio_file *inrec_array,
    struct darshan_mpiio_file *outrec_array, int shared_rec_count);
static void mpiio_cleanup_runtime(
    void);

static void mpiio_shutdown(
    MPI_Comm mod_comm, darshan_record_id *shared_recs,
    int shared_rec_count, void **mpiio_buf, int *mpiio_buf_sz);

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static struct mpiio_runtime *mpiio_runtime = NULL;
static pthread_mutex_t mpiio_runtime_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
static int instrumentation_disabled = 0;
static int my_rank = -1;

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#define MPIIO_LOCK() pthread_mutex_lock(&mpiio_runtime_mutex)
#define MPIIO_UNLOCK() pthread_mutex_unlock(&mpiio_runtime_mutex)

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#define MPIIO_PRE_RECORD() do { \
    MPIIO_LOCK(); \
    if(!mpiio_runtime && !instrumentation_disabled) mpiio_runtime_initialize(); \
    if(!mpiio_runtime) { \
        MPIIO_UNLOCK(); \
        return(ret); \
    } \
} while(0)

#define MPIIO_POST_RECORD() do { \
    MPIIO_UNLOCK(); \
} while(0)

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#define MPIIO_RECORD_OPEN(__ret, __path, __fh, __comm, __mode, __info, __tm1, __tm2) do { \
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    darshan_record_id rec_id; \
    struct mpiio_file_record_ref *rec_ref; \
    char *newpath; \
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    int comm_size; \
    if(__ret != MPI_SUCCESS) break; \
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    newpath = darshan_clean_file_path(__path); \
    if(!newpath) newpath = (char *)__path; \
    if(darshan_core_excluded_path(newpath)) { \
        if(newpath != __path) free(newpath); \
        break; \
    } \
    rec_id = darshan_core_gen_record_id(newpath); \
    rec_ref = darshan_lookup_record_ref(mpiio_runtime->rec_id_hash, &rec_id, sizeof(darshan_record_id)); \
    if(!rec_ref) rec_ref = mpiio_track_new_file_record(rec_id, newpath); \
    if(!rec_ref) { \
        if(newpath != __path) free(newpath); \
        break; \
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    } \
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    rec_ref->file_rec->counters[MPIIO_MODE] = __mode; \
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    DARSHAN_MPI_CALL(PMPI_Comm_size)(__comm, &comm_size); \
    if(comm_size == 1) \
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        rec_ref->file_rec->counters[MPIIO_INDEP_OPENS] += 1; \
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    else \
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        rec_ref->file_rec->counters[MPIIO_COLL_OPENS] += 1; \
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    if(__info != MPI_INFO_NULL) \
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        rec_ref->file_rec->counters[MPIIO_HINTS] += 1; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] > __tm1) \
        rec_ref->file_rec->fcounters[MPIIO_F_OPEN_TIMESTAMP] = __tm1; \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_META_TIME], \
        __tm1, __tm2, rec_ref->last_meta_end); \
    darshan_add_record_ref(&(mpiio_runtime->fh_hash), &__fh, sizeof(MPI_File), rec_ref); \
    if(newpath != __path) free(newpath); \
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} while(0)

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#define MPIIO_RECORD_READ(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
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    struct mpiio_file_record_ref *rec_ref; \
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    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
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    if(__ret != MPI_SUCCESS) break; \
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    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash, &(__fh), sizeof(MPI_File)); \
    if(!rec_ref) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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    DARSHAN_BUCKET_INC(&(rec_ref->file_rec->counters[MPIIO_SIZE_READ_AGG_0_100]), size); \
    darshan_common_val_counter(&rec_ref->access_root, &rec_ref->access_count, size, \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_ACCESS]), \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_COUNT])); \
    rec_ref->file_rec->counters[MPIIO_BYTES_READ] += size; \
    rec_ref->file_rec->counters[__counter] += 1; \
    if(rec_ref->last_io_type == DARSHAN_IO_WRITE) \
        rec_ref->file_rec->counters[MPIIO_RW_SWITCHES] += 1; \
    rec_ref->last_io_type = DARSHAN_IO_READ; \
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    if(rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] = __tm1; \
    rec_ref->file_rec->fcounters[MPIIO_F_READ_END_TIMESTAMP] = __tm2; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_MAX_READ_TIME] < __elapsed) { \
        rec_ref->file_rec->fcounters[MPIIO_F_MAX_READ_TIME] = __elapsed; \
        rec_ref->file_rec->counters[MPIIO_MAX_READ_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_READ_TIME], \
        __tm1, __tm2, rec_ref->last_read_end); \
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} while(0)
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#define MPIIO_RECORD_WRITE(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
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    struct mpiio_file_record_ref *rec_ref; \
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    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
    if(__ret != MPI_SUCCESS) break; \
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    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash, &(__fh), sizeof(MPI_File)); \
    if(!rec_ref) break; \
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    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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    DARSHAN_BUCKET_INC(&(rec_ref->file_rec->counters[MPIIO_SIZE_WRITE_AGG_0_100]), size); \
    darshan_common_val_counter(&rec_ref->access_root, &rec_ref->access_count, size, \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_ACCESS]), \
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_COUNT])); \
    rec_ref->file_rec->counters[MPIIO_BYTES_WRITTEN] += size; \
    rec_ref->file_rec->counters[__counter] += 1; \
    if(rec_ref->last_io_type == DARSHAN_IO_READ) \
        rec_ref->file_rec->counters[MPIIO_RW_SWITCHES] += 1; \
    rec_ref->last_io_type = DARSHAN_IO_WRITE; \
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    if(rec_ref->file_rec->fcounters[MPIIO_F_WRITE_START_TIMESTAMP] == 0 || \
     rec_ref->file_rec->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        rec_ref->file_rec->fcounters[MPIIO_F_WRITE_START_TIMESTAMP] = __tm1; \
    rec_ref->file_rec->fcounters[MPIIO_F_WRITE_END_TIMESTAMP] = __tm2; \
    if(rec_ref->file_rec->fcounters[MPIIO_F_MAX_WRITE_TIME] < __elapsed) { \
        rec_ref->file_rec->fcounters[MPIIO_F_MAX_WRITE_TIME] = __elapsed; \
        rec_ref->file_rec->counters[MPIIO_MAX_WRITE_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME], \
        __tm1, __tm2, rec_ref->last_write_end); \
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} while(0)

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/**********************************************************
 *        Wrappers for MPI-IO functions of interest       * 
 **********************************************************/
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#ifdef HAVE_MPIIO_CONST
int MPI_File_open(MPI_Comm comm, const char *filename, int amode, MPI_Info info, MPI_File *fh) 
#else
int MPI_File_open(MPI_Comm comm, char *filename, int amode, MPI_Info info, MPI_File *fh) 
#endif
{
    int ret;
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    MPI_File tmp_fh;
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    char* tmp;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_open)(comm, filename, amode, info, fh);
    tm2 = darshan_core_wtime();

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    /* 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;
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    }

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    MPIIO_PRE_RECORD();
    tmp_fh = *fh;
    MPIIO_RECORD_OPEN(ret, filename, tmp_fh, comm, amode, info, tm1, tm2);
    MPIIO_POST_RECORD();

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    return(ret);
}

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

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read)(fh, buf, count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write(MPI_File fh, const void *buf, int count,
    MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write(MPI_File fh, void *buf, int count,
    MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write)(fh, buf, count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at(MPI_File fh, MPI_Offset offset, const void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_at(MPI_File fh, MPI_Offset offset, void *buf,
    int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_all(MPI_File fh, const void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_all(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
#else
int MPI_File_write_at_all(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, MPI_Status * status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all)(fh, offset, buf,
        count, datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

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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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_shared)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_shared(MPI_File fh, const void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#else
int MPI_File_write_shared(MPI_File fh, void * buf, int count, MPI_Datatype datatype, MPI_Status *status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_shared)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered)(fh, buf, count,
        datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_ordered(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, MPI_Status * status)
#else
int MPI_File_write_ordered(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, MPI_Status * status)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered)(fh, buf, count,
         datatype, status);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
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    MPIIO_POST_RECORD();

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    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_all_begin)(fh, buf, count, datatype);
    tm2 = darshan_core_wtime();

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    MPIIO_PRE_RECORD();
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    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
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    MPIIO_POST_RECORD();

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    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_all_begin(MPI_File fh, const void * buf, int count, MPI_Datatype datatype)
#else
int MPI_File_write_all_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_all_begin)(fh, buf, count, datatype);
    tm2 = darshan_core_wtime();

509
    MPIIO_PRE_RECORD();
510
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
511 512
    MPIIO_POST_RECORD();

513 514 515 516 517 518 519 520 521 522 523 524 525 526
    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all_begin)(fh, offset, buf,
        count, datatype);
    tm2 = darshan_core_wtime();
    
527
    MPIIO_PRE_RECORD();
528
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
529 530
    MPIIO_POST_RECORD();

531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype)
#else
int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_at_all_begin)(fh, offset,
        buf, count, datatype);
    tm2 = darshan_core_wtime();

550
    MPIIO_PRE_RECORD();
551
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
552 553
    MPIIO_POST_RECORD();

554 555 556 557 558 559 560 561 562 563 564 565 566
    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_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_ordered_begin)(fh, buf, count,
        datatype);
    tm2 = darshan_core_wtime();

567
    MPIIO_PRE_RECORD();
568
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
569 570
    MPIIO_POST_RECORD();

571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_write_ordered_begin(MPI_File fh, const void * buf, int count, MPI_Datatype datatype)
#else
int MPI_File_write_ordered_begin(MPI_File fh, void * buf, int count, MPI_Datatype datatype)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_write_ordered_begin)(fh, buf, count,
        datatype);
    tm2 = darshan_core_wtime();

588
    MPIIO_PRE_RECORD();
589
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
590 591
    MPIIO_POST_RECORD();

592 593 594 595 596 597 598 599 600 601 602 603
    return(ret);
}

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

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread)(fh, buf, count, datatype, request);
    tm2 = darshan_core_wtime();

604
    MPIIO_PRE_RECORD();
605
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
606 607
    MPIIO_POST_RECORD();

608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#else
int MPI_File_iwrite(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite)(fh, buf, count, datatype, request);
    tm2 = darshan_core_wtime();

626
    MPIIO_PRE_RECORD();
627
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
628 629
    MPIIO_POST_RECORD();

630 631 632 633 634 635 636 637 638 639 640 641 642 643
    return(ret);
}

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

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_at)(fh, offset, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

644
    MPIIO_PRE_RECORD();
645
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
646 647
    MPIIO_POST_RECORD();

648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, const void * buf,
    int count, MPI_Datatype datatype, __D_MPI_REQUEST *request)
#else
int MPI_File_iwrite_at(MPI_File fh, MPI_Offset offset, void * buf,
    int count, MPI_Datatype datatype, __D_MPI_REQUEST *request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_at)(fh, offset, buf,
        count, datatype, request);
    tm2 = darshan_core_wtime();

667
    MPIIO_PRE_RECORD();
668
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
669 670
    MPIIO_POST_RECORD();

671 672 673 674 675 676 677 678 679 680 681 682 683 684
    return(ret);
}

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

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iread_shared)(fh, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

685
    MPIIO_PRE_RECORD();
686
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
687 688
    MPIIO_POST_RECORD();

689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_iwrite_shared(MPI_File fh, const void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#else
int MPI_File_iwrite_shared(MPI_File fh, void * buf, int count,
    MPI_Datatype datatype, __D_MPI_REQUEST * request)
#endif
{
    int ret;
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_iwrite_shared)(fh, buf, count,
        datatype, request);
    tm2 = darshan_core_wtime();

708
    MPIIO_PRE_RECORD();
709
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
710 711
    MPIIO_POST_RECORD();

712 713
    return(ret);
}
714 715 716 717

int MPI_File_sync(MPI_File fh)
{
    int ret;
718
    struct mpiio_file_record_ref *rec_ref;
719 720 721 722 723 724 725 726
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_sync)(fh);
    tm2 = darshan_core_wtime();

    if(ret == MPI_SUCCESS)
    {
727 728 729 730
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
731
        {
732
            rec_ref->file_rec->counters[MPIIO_SYNCS] += 1;
733
            DARSHAN_TIMER_INC_NO_OVERLAP(
734 735
                rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME],
                tm1, tm2, rec_ref->last_write_end);
736
        }
737
        MPIIO_POST_RECORD();
738 739 740 741 742 743 744 745 746 747 748 749 750 751
    }

    return(ret);
}

#ifdef HAVE_MPIIO_CONST
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
    MPI_Datatype filetype, const char *datarep, MPI_Info info)
#else
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
    MPI_Datatype filetype, char *datarep, MPI_Info info)
#endif
{
    int ret;
752
    struct mpiio_file_record_ref *rec_ref;
753 754 755 756 757 758 759 760 761
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_set_view)(fh, disp, etype, filetype,
        datarep, info);
    tm2 = darshan_core_wtime();

    if(ret == MPI_SUCCESS)
    {
762 763 764 765
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
766
        {
767
            rec_ref->file_rec->counters[MPIIO_VIEWS] += 1;
768 769
            if(info != MPI_INFO_NULL)
            {
770
                rec_ref->file_rec->counters[MPIIO_HINTS] += 1;
771
                DARSHAN_TIMER_INC_NO_OVERLAP(
772 773
                    rec_ref->file_rec->fcounters[MPIIO_F_META_TIME],
                    tm1, tm2, rec_ref->last_meta_end);
774 775
           }
        }
776
        MPIIO_POST_RECORD();
777 778 779 780 781
    }

    return(ret);
}

782 783 784
int MPI_File_close(MPI_File *fh)
{
    int ret;
785
    struct mpiio_file_record_ref *rec_ref;
786
    MPI_File tmp_fh = *fh;
787 788 789 790 791 792
    double tm1, tm2;

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_close)(fh);
    tm2 = darshan_core_wtime();

793 794 795 796
    MPIIO_PRE_RECORD();
    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
        &tmp_fh, sizeof(MPI_File));
    if(rec_ref)
797
    {
798
        rec_ref->file_rec->fcounters[MPIIO_F_CLOSE_TIMESTAMP] =
799 800
            darshan_core_wtime();
        DARSHAN_TIMER_INC_NO_OVERLAP(
801 802 803 804
            rec_ref->file_rec->fcounters[MPIIO_F_META_TIME],
            tm1, tm2, rec_ref->last_meta_end);
        darshan_delete_record_ref(&(mpiio_runtime->fh_hash),
            &tmp_fh, sizeof(MPI_File));
805
    }
806
    MPIIO_POST_RECORD();
807 808 809 810 811 812 813 814 815

    return(ret);
}

/***********************************************************
 * Internal functions for manipulating MPI-IO module state *
 ***********************************************************/

/* initialize data structures and register with darshan-core component */
816 817
static void mpiio_runtime_initialize()
{
818
    int mpiio_buf_size;
819

820 821 822
    /* try and store the default number of records for this module */
    mpiio_buf_size = DARSHAN_DEF_MOD_REC_COUNT * sizeof(struct darshan_mpiio_file);

823 824 825
    /* register the mpiio module with darshan core */
    darshan_core_register_module(
        DARSHAN_MPIIO_MOD,
826
        &mpiio_shutdown,
827
        &mpiio_buf_size,
828
        &my_rank,
829
        NULL);
830

831 832
    /* return if darshan-core does not provide enough module memory */
    if(mpiio_buf_size < sizeof(struct darshan_mpiio_file))
833 834
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
835
        return;
836
    }
837 838 839

    mpiio_runtime = malloc(sizeof(*mpiio_runtime));
    if(!mpiio_runtime)
840 841
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
842
        return;
843
    }
844 845 846 847 848
    memset(mpiio_runtime, 0, sizeof(*mpiio_runtime));

    return;
}

849 850
static struct mpiio_file_record_ref *mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path)
851
{
852 853
    struct darshan_mpiio_file *file_rec = NULL;
    struct mpiio_file_record_ref *rec_ref = NULL;
854
    int ret;
855

856 857
    rec_ref = malloc(sizeof(*rec_ref));
    if(!rec_ref)
858
        return(NULL);
859
    memset(rec_ref, 0, sizeof(*rec_ref));
860

861 862 863 864
    /* add a reference to this file record based on record id */
    ret = darshan_add_record_ref(&(mpiio_runtime->rec_id_hash), &rec_id,
        sizeof(darshan_record_id), rec_ref);
    if(ret == 0)
865
    {
866
        free(rec_ref);
867 868 869
        return(NULL);
    }

870 871
    /* register the actual file record with darshan-core so it is persisted
     * in the log file
872
     */
873 874 875 876 877 878
    file_rec = darshan_core_register_record(
        rec_id,
        path,
        DARSHAN_MPIIO_MOD,
        sizeof(struct darshan_mpiio_file),
        NULL);
879

880
    if(!file_rec)
881
    {
882 883 884 885
        darshan_delete_record_ref(&(mpiio_runtime->rec_id_hash),
            &rec_id, sizeof(darshan_record_id));
        free(rec_ref);
        return(NULL);
886 887
    }

888 889 890 891 892 893 894
    /* registering this file record was successful, so initialize some fields */
    file_rec->base_rec.id = rec_id;
    file_rec->base_rec.rank = my_rank;
    rec_ref->file_rec = file_rec;
    mpiio_runtime->file_rec_count++;

    return(rec_ref);
895 896
}

897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
static void mpiio_finalize_file_records(void *rec_ref_p)
{
    struct mpiio_file_record_ref *rec_ref =
        (struct mpiio_file_record_ref *)rec_ref_p;

#ifndef __DARSHAN_ENABLE_MMAP_LOGS
    /* walk common counters to get 4 most common -- only if mmap
     * feature is disabled (mmap updates counters on the go)
     */

    /* common accesses */
    darshan_walk_common_vals(rec_ref->access_root,
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_ACCESS]),
        &(rec_ref->file_rec->counters[MPIIO_ACCESS1_COUNT]));
#endif

    tdestroy(rec_ref->access_root, free);

    return;
}

918 919 920 921 922
static void mpiio_record_reduction_op(
    void* infile_v,
    void* inoutfile_v,
    int *len,
    MPI_Datatype *datatype)
923
{
924 925 926
    struct darshan_mpiio_file tmp_file;
    struct darshan_mpiio_file *infile = infile_v;
    struct darshan_mpiio_file *inoutfile = inoutfile_v;
927
    int i, j, k;
928

929 930 931
    for(i=0; i<*len; i++)
    {
        memset(&tmp_file, 0, sizeof(struct darshan_mpiio_file));
932 933
        tmp_file.base_rec.id = infile->base_rec.id;
        tmp_file.base_rec.rank = -1;
934 935

        /* sum */
936 937 938 939 940 941 942 943 944
        for(j=MPIIO_INDEP_OPENS; j<=MPIIO_VIEWS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

        tmp_file.counters[MPIIO_MODE] = infile->counters[MPIIO_MODE];

        /* sum */
        for(j=MPIIO_BYTES_READ; j<=MPIIO_RW_SWITCHES; j++)
945 946 947 948
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
        /* skip MPIIO_MAX_*_TIME_SIZE; handled in floating point section */

        for(j=MPIIO_SIZE_READ_AGG_0_100; j<=MPIIO_SIZE_WRITE_AGG_1G_PLUS; j++)
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

        /* first collapse any duplicates */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
        {
            for(k=MPIIO_ACCESS1_ACCESS; k<=MPIIO_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;
                }
            }
        }

        /* first set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
        {
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), infile->counters[j],
975
                infile->counters[j+4], 0);
976 977 978 979
        }

        /* second set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
980
        {
981 982
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), inoutfile->counters[j],
983
                inoutfile->counters[j+4], 0);
984 985 986
        }

        /* min non-zero (if available) value */
987
        for(j=MPIIO_F_OPEN_TIMESTAMP; j<=MPIIO_F_WRITE_START_TIMESTAMP; j++)
988
        {
989 990
            if((infile->fcounters[j] < inoutfile->fcounters[j] &&
               infile->fcounters[j] > 0) || inoutfile->fcounters[j] == 0)
991
                tmp_file.fcounters[j] = infile->fcounters[j];
992 993
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
994 995
        }

996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
        /* max */
        for(j=MPIIO_F_READ_END_TIMESTAMP; j<= MPIIO_F_CLOSE_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=MPIIO_F_READ_TIME; j<=MPIIO_F_META_TIME; j++)
        {
1008
            tmp_file.fcounters[j] = infile->fcounters[j] + inoutfile->fcounters[j];
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
        }

        /* max (special case) */
        if(infile->fcounters[MPIIO_F_MAX_READ_TIME] >
            inoutfile->fcounters[MPIIO_F_MAX_READ_TIME])
        {
            tmp_file.fcounters[MPIIO_F_MAX_READ_TIME] =
                infile->fcounters[MPIIO_F_MAX_READ_TIME];
            tmp_file.counters[MPIIO_MAX_READ_TIME_SIZE] =
                infile->counters[MPIIO_MAX_READ_TIME_SIZE];
        }
        else
        {
            tmp_file.fcounters[MPIIO_F_MAX_READ_TIME] =
                inoutfile->fcounters[MPIIO_F_MAX_READ_TIME];
            tmp_file.counters[MPIIO_MAX_READ_TIME_SIZE] =
                inoutfile->counters[MPIIO_MAX_READ_TIME_SIZE];
        }

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

1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
        /* min (zeroes are ok here; some procs don't do I/O) */
        if(infile->fcounters[MPIIO_F_FASTEST_RANK_TIME] <
            inoutfile->fcounters[MPIIO_F_FASTEST_RANK_TIME])
        {
            tmp_file.counters[MPIIO_FASTEST_RANK] =
                infile->counters[MPIIO_FASTEST_RANK];
            tmp_file.counters[MPIIO_FASTEST_RANK_BYTES] =
                infile->counters[MPIIO_FASTEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_FASTEST_RANK_TIME] =
                infile->fcounters[MPIIO_F_FASTEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[MPIIO_FASTEST_RANK] =
                inoutfile->counters[MPIIO_FASTEST_RANK];
            tmp_file.counters[MPIIO_FASTEST_RANK_BYTES] =
                inoutfile->counters[MPIIO_FASTEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_FASTEST_RANK_TIME] =
                inoutfile->fcounters[MPIIO_F_FASTEST_RANK_TIME];
        }

        /* max */
        if(infile->fcounters[MPIIO_F_SLOWEST_RANK_TIME] >
           inoutfile->fcounters[MPIIO_F_SLOWEST_RANK_TIME])
        {
            tmp_file.counters[MPIIO_SLOWEST_RANK] =
                infile->counters[MPIIO_SLOWEST_RANK];
            tmp_file.counters[MPIIO_SLOWEST_RANK_BYTES] =
                infile->counters[MPIIO_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                infile->fcounters[MPIIO_F_SLOWEST_RANK_TIME];
        }
        else
        {
            tmp_file.counters[MPIIO_SLOWEST_RANK] =
                inoutfile->counters[MPIIO_SLOWEST_RANK];
            tmp_file.counters[MPIIO_SLOWEST_RANK_BYTES] =
                inoutfile->counters[MPIIO_SLOWEST_RANK_BYTES];
            tmp_file.fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                inoutfile->fcounters[MPIIO_F_SLOWEST_RANK_TIME];
        }

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        /* update pointers */
        *inoutfile = tmp_file;
        inoutfile++;
        infile++;
    }

    return;
}

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static void mpiio_shared_record_variance(MPI_Comm mod_comm,
    struct darshan_mpiio_file *inrec_array, struct darshan_mpiio_file *outrec_array,
    int shared_rec_count)
{
    MPI_Datatype var_dt;
    MPI_Op var_op;
    int i;
    struct darshan_variance_dt *var_send_buf = NULL;
    struct darshan_variance_dt *var_recv_buf = NULL;

    DARSHAN_MPI_CALL(PMPI_Type_contiguous)(sizeof(struct darshan_variance_dt),
        MPI_BYTE, &var_dt);
    DARSHAN_MPI_CALL(PMPI_Type_commit)(&var_dt);

    DARSHAN_MPI_CALL(PMPI_Op_create)(darshan_variance_reduce, 1, &var_op);

    var_send_buf = malloc(shared_rec_count * sizeof(struct darshan_variance_dt));
    if(!var_send_buf)
        return;

    if(my_rank == 0)
    {
        var_recv_buf = malloc(shared_rec_count * sizeof(struct darshan_variance_dt));

        if(!var_recv_buf)
            return;
    }

    /* get total i/o time variances for shared records */

    for(i=0; i<shared_rec_count; i++)
    {
        var_send_buf[i].n = 1;
        var_send_buf[i].S = 0;
        var_send_buf[i].T = inrec_array[i].fcounters[MPIIO_F_READ_TIME] +
                            inrec_array[i].fcounters[MPIIO_F_WRITE_TIME] +
                            inrec_array[i].fcounters[MPIIO_F_META_TIME];
    }

    DARSHAN_MPI_CALL(PMPI_Reduce)(var_send_buf, var_recv_buf, shared_rec_count,
        var_dt, var_op, 0, mod_comm);

    if(my_rank == 0)
    {
        for(i=0; i<shared_rec_count; i++)
        {
            outrec_array[i].fcounters[MPIIO_F_VARIANCE_RANK_TIME] =
                (var_recv_buf[i].S / var_recv_buf[i].n);
        }
    }

    /* get total bytes moved variances for shared records */

    for(i=0; i<shared_rec_count; i++)
    {
        var_send_buf[i].n = 1;
        var_send_buf[i].S = 0;
        var_send_buf[i].T = (double)
                            inrec_array[i].counters[MPIIO_BYTES_READ] +
                            inrec_array[i].counters[MPIIO_BYTES_WRITTEN];
    }

    DARSHAN_MPI_CALL(PMPI_Reduce)(var_send_buf, var_recv_buf, shared_rec_count,
        var_dt, var_op, 0, mod_comm);

    if(my_rank == 0)
    {
        for(i=0; i<shared_rec_count; i++)
        {
            outrec_array[i].fcounters[MPIIO_F_VARIANCE_RANK_BYTES] =
                (var_recv_buf[i].S / var_recv_buf[i].n);
        }
    }

    DARSHAN_MPI_CALL(PMPI_Type_free)(&var_dt);
    DARSHAN_MPI_CALL(PMPI_Op_free)(&var_op);
    free(var_send_buf);
    free(var_recv_buf);

    return;
}

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static void mpiio_cleanup_runtime()
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{
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    darshan_clear_record_refs(&(mpiio_runtime->fh_hash), 0);
    darshan_clear_record_refs(&(mpiio_runtime->rec_id_hash), 1);
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    free(mpiio_runtime);
    mpiio_runtime = NULL;
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    return;
}

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/* mpiio module shutdown benchmark routine */
void darshan_mpiio_shutdown_bench_setup(int test_case)
{
    char filepath[256];
    MPI_File *fh_array;
    int64_t *size_array;
    int i;
    intptr_t j;

    if(mpiio_runtime)
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        mpiio_cleanup_runtime();
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    mpiio_runtime_initialize();

    srand(my_rank);
    fh_array = malloc(1024 * sizeof(MPI_File));
    size_array = malloc(DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT * sizeof(int64_t));
    assert(fh_array && size_array);

    for(j = 0; j < 1024; j++)
        fh_array[j] = (MPI_File)j;
    for(i = 0; i < DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT; i++)
        size_array[i] = rand();

    switch(test_case)
    {
        case 1: /* single file-per-process */
            snprintf(filepath, 256, "fpp-0_rank-%d", my_rank);

            MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[0], MPI_COMM_SELF,
                2, MPI_INFO_NULL, 0, 1);
            MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[0], size_array[0], MPI_BYTE,
                MPIIO_INDEP_WRITES, 1, 2);

            break;
        case 2: /* single shared file */
            snprintf(filepath, 256, "shared-0");

            MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[0], MPI_COMM_WORLD,
                2, MPI_INFO_NULL, 0, 1);
            MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[0], size_array[0], MPI_BYTE,
                MPIIO_COLL_WRITES, 1, 2);

            break;
        case 3: /* 1024 unique files per proc */
            for(i = 0; i < 1024; i++)
            {
                snprintf(filepath, 256, "fpp-%d_rank-%d", i , my_rank);

                MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[i], MPI_COMM_SELF,
                    2, MPI_INFO_NULL, 0, 1);
                MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[i],
                    size_array[i % DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT],
                    MPI_BYTE, MPIIO_INDEP_WRITES, 1, 2);
            }

            break;
        case 4: /* 1024 shared files per proc */
            for(i = 0; i < 1024; i++)
            {
                snprintf(filepath, 256, "shared-%d", i);

                MPIIO_RECORD_OPEN(MPI_SUCCESS, filepath, fh_array[i], MPI_COMM_WORLD,
                    2, MPI_INFO_NULL, 0, 1);
                MPIIO_RECORD_WRITE(MPI_SUCCESS, fh_array[i],
                    size_array[i % DARSHAN_COMMON_VAL_MAX_RUNTIME_COUNT],
                    MPI_BYTE, MPIIO_COLL_WRITES, 1, 2);
            }
            break;
        default:
            fprintf(stderr, "Error: invalid Darshan benchmark test case.\n");
            return;
    }

    return;
}

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/********************************************************************************
 * shutdown function exported by this module for coordinating with darshan-core *
 ********************************************************************************/
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static void mpiio_shutdown(
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    MPI_Comm mod_comm,
    darshan_record_id *shared_recs,
    int shared_rec_count,
    void **mpiio_buf,
    int *mpiio_buf_sz)
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{
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    struct mpiio_file_record_ref *rec_ref;
    struct darshan_mpiio_file *mpiio_rec_buf = *(struct darshan_mpiio_file **)mpiio_buf;
    int mpiio_rec_count;
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    double mpiio_time;
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    struct darshan_mpiio_file *red_send_buf = NULL;
    struct darshan_mpiio_file *red_recv_buf = NULL;
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    MPI_Datatype red_type;
    MPI_Op red_op;
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    int i;
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    MPIIO_LOCK();
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    assert(mpiio_runtime);
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    mpiio_rec_count = mpiio_runtime->file_rec_count;
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    /* perform any final transformations on MPIIO file records before
     * writing them out to log file
     */
    darshan_iter_record_refs(mpiio_runtime->rec_id_hash, &mpiio_finalize_file_records);
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    /* if there are globally shared files, do a shared file reduction */
    /* NOTE: the shared file reduction is also skipped if the 
     * DARSHAN_DISABLE_SHARED_REDUCTION environment variable is set.
     */
    if(shared_rec_count && !getenv("DARSHAN_DISABLE_SHARED_REDUCTION"))
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    {
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        /* necessary initialization of shared records */
        for(i = 0; i < shared_rec_count; i++)
        {
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            rec_ref = darshan_lookup_record_ref(mpiio_runtime->rec_id_hash,
                &shared_recs[i], sizeof(darshan_record_id));
            assert(rec_ref);
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            mpiio_time =
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                rec_ref->file_rec->fcounters[MPIIO_F_READ_TIME] +
                rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME] +
                rec_ref->file_rec->fcounters[MPIIO_F_META_TIME];
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            /* initialize fastest/slowest info prior to the reduction */
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            rec_ref->file_rec->counters[MPIIO_FASTEST_RANK] =
                rec_ref->file_rec->base_rec.rank;
            rec_ref->file_rec->counters[MPIIO_FASTEST_RANK_BYTES] =
                rec_ref->file_rec->counters[MPIIO_BYTES_READ] +
                rec_ref->file_rec->counters[MPIIO_BYTES_WRITTEN];
            rec_ref->file_rec->fcounters[MPIIO_F_FASTEST_RANK_TIME] =
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                mpiio_time;

            /* until reduction occurs, we assume that this rank is both
             * the fastest and slowest. It is up to the reduction operator
             * to find the true min and max.
             */
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            rec_ref->file_rec->counters[MPIIO_SLOWEST_RANK] =
                rec_ref->file_rec->counters[MPIIO_FASTEST_RANK];
            rec_ref->file_rec->counters[MPIIO_SLOWEST_RANK_BYTES] =
                rec_ref->file_rec->counters[MPIIO_FASTEST_RANK_BYTES];
            rec_ref->file_rec->fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                rec_ref->file_rec->fcounters[MPIIO_F_FASTEST_RANK_TIME];

            rec_ref->file_rec->base_rec.rank = -1;
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        }

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        /* sort the array of records so we get all of the shared records
         * (marked by rank -1) in a contiguous portion at end of the array
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         */
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        darshan_record_sort(mpiio_rec_buf, mpiio_rec_count,
            sizeof(struct darshan_mpiio_file));
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        /* make send_buf point to the shared files at the end of sorted array */
        red_send_buf = &(mpiio_rec_buf[mpiio_rec_count-shared_rec_count]);
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        /* allocate memory for the reduction output on rank 0 */
        if(my_rank == 0)
        {
            red_recv_buf = malloc(shared_rec_count * sizeof(struct darshan_mpiio_file));
            if(!red_recv_buf)
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            {
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                MPIIO_UNLOCK();
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                return;
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            }
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        }

        /* construct a datatype for a MPIIO file record.  This is serving no purpose
         * except to make sure we can do a reduction on proper boundaries
         */
        DARSHAN_MPI_CALL(PMPI_Type_contiguous)(sizeof(struct darshan_mpiio_file),
            MPI_BYTE, &red_type);
        DARSHAN_MPI_CALL(PMPI_Type_commit)(&red_type);

        /* register a MPIIO file record reduction operator */
        DARSHAN_MPI_CALL(PMPI_Op_create)(mpiio_record_reduction_op, 1, &red_op);

        /* reduce shared MPIIO file records */
        DARSHAN_MPI_CALL(PMPI_Reduce)(red_send_buf, red_recv_buf,
            shared_rec_count, red_type, red_op, 0, mod_comm);

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        /* get the time and byte variances for shared files */
        mpiio_shared_record_variance(mod_comm, red_send_buf, red_recv_buf,
            shared_rec_count);

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        /* clean up reduction state */
        if(my_rank == 0)
        {
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            int tmp_ndx = mpiio_rec_count - shared_rec_count;
            memcpy(&(mpiio_rec_buf[tmp_ndx]), red_recv_buf,
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                shared_rec_count * sizeof(struct darshan_mpiio_file));
            free(red_recv_buf);
        }
        else
        {
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            mpiio_rec_count -= shared_rec_count;
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        }

        DARSHAN_MPI_CALL(PMPI_Type_free)(&red_type);
        DARSHAN_MPI_CALL(PMPI_Op_free)(&red_op);
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    }

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    *mpiio_buf_sz = mpiio_rec_count * sizeof(struct darshan_mpiio_file);
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    /* shutdown internal structures used for instrumenting */
    mpiio_cleanup_runtime();
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    /* disable further instrumentation */
    instrumentation_disabled = 1;
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    MPIIO_UNLOCK();
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    return;
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}

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Philip Carns committed
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/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */