darshan-mpiio.c 45 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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/* extern DXT function defs */
extern void dxt_mpiio_write(darshan_record_id rec_id, int64_t length,
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    double start_time, double end_time);
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extern void dxt_mpiio_read(darshan_record_id rec_id, int64_t length,
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    double start_time, double end_time);

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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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static int enable_dxt_io_trace = 0;
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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(); \
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    if(!instrumentation_disabled) { \
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        if(!mpiio_runtime) { \
            mpiio_runtime_initialize(); \
        } \
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        if(mpiio_runtime) break; \
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    } \
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    MPIIO_UNLOCK(); \
    return(ret); \
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} 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)); \
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    if(!rec_ref) rec_ref = mpiio_track_new_file_record(rec_id, newpath); \
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    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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    /* DXT to record detailed read tracing information */ \
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    if(enable_dxt_io_trace) { \
        dxt_mpiio_read(rec_ref->file_rec->base_rec.id, size, __tm1, __tm2); \
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    } \
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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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     /* DXT to record detailed write tracing information */ \
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    if(enable_dxt_io_trace) { \
        dxt_mpiio_write(rec_ref->file_rec->base_rec.id, size, __tm1, __tm2); \
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    } \
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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 || \
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     rec_ref->file_rec->fcounters[MPIIO_F_WRITE_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();

507
    MPIIO_PRE_RECORD();
508
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
509 510
    MPIIO_POST_RECORD();

511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526
    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();

527
    MPIIO_PRE_RECORD();
528
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
529 530
    MPIIO_POST_RECORD();

531 532 533 534 535 536 537 538 539 540 541 542 543 544
    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();
    
545
    MPIIO_PRE_RECORD();
546
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
547 548
    MPIIO_POST_RECORD();

549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
    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();

568
    MPIIO_PRE_RECORD();
569
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
570 571
    MPIIO_POST_RECORD();

572 573 574 575 576 577 578 579 580 581 582 583 584
    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();

585
    MPIIO_PRE_RECORD();
586
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
587 588
    MPIIO_POST_RECORD();

589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
    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();

606
    MPIIO_PRE_RECORD();
607
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
608 609
    MPIIO_POST_RECORD();

610 611 612 613 614 615 616 617 618 619 620 621
    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();

622
    MPIIO_PRE_RECORD();
623
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
624 625
    MPIIO_POST_RECORD();

626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
    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();

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

648 649 650 651 652 653 654 655 656 657 658 659 660 661
    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();

662
    MPIIO_PRE_RECORD();
663
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
664 665
    MPIIO_POST_RECORD();

666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684
    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();

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

689 690 691 692 693 694 695 696 697 698 699 700 701 702
    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();

703
    MPIIO_PRE_RECORD();
704
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
705 706
    MPIIO_POST_RECORD();

707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
    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();

726
    MPIIO_PRE_RECORD();
727
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
728 729
    MPIIO_POST_RECORD();

730 731
    return(ret);
}
732 733 734 735

int MPI_File_sync(MPI_File fh)
{
    int ret;
736
    struct mpiio_file_record_ref *rec_ref;
737 738 739 740 741 742 743 744
    double tm1, tm2;

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

    if(ret == MPI_SUCCESS)
    {
745 746 747 748
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
749
        {
750
            rec_ref->file_rec->counters[MPIIO_SYNCS] += 1;
751
            DARSHAN_TIMER_INC_NO_OVERLAP(
752 753
                rec_ref->file_rec->fcounters[MPIIO_F_WRITE_TIME],
                tm1, tm2, rec_ref->last_write_end);
754
        }
755
        MPIIO_POST_RECORD();
756 757 758 759 760 761 762 763 764 765 766 767 768 769
    }

    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;
770
    struct mpiio_file_record_ref *rec_ref;
771 772 773 774 775 776 777 778 779
    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)
    {
780 781 782 783
        MPIIO_PRE_RECORD();
        rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
            &fh, sizeof(MPI_File));
        if(rec_ref)
784
        {
785
            rec_ref->file_rec->counters[MPIIO_VIEWS] += 1;
786 787
            if(info != MPI_INFO_NULL)
            {
788
                rec_ref->file_rec->counters[MPIIO_HINTS] += 1;
789
                DARSHAN_TIMER_INC_NO_OVERLAP(
790 791
                    rec_ref->file_rec->fcounters[MPIIO_F_META_TIME],
                    tm1, tm2, rec_ref->last_meta_end);
792 793
           }
        }
794
        MPIIO_POST_RECORD();
795 796 797 798 799
    }

    return(ret);
}

800 801 802
int MPI_File_close(MPI_File *fh)
{
    int ret;
803
    struct mpiio_file_record_ref *rec_ref;
804
    MPI_File tmp_fh = *fh;
805 806 807 808 809 810
    double tm1, tm2;

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

811 812 813 814
    MPIIO_PRE_RECORD();
    rec_ref = darshan_lookup_record_ref(mpiio_runtime->fh_hash,
        &tmp_fh, sizeof(MPI_File));
    if(rec_ref)
815
    {
816
        rec_ref->file_rec->fcounters[MPIIO_F_CLOSE_TIMESTAMP] =
817 818
            darshan_core_wtime();
        DARSHAN_TIMER_INC_NO_OVERLAP(
819 820 821 822
            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));
823
    }
824
    MPIIO_POST_RECORD();
825 826 827 828 829 830 831 832 833

    return(ret);
}

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

/* initialize data structures and register with darshan-core component */
834 835
static void mpiio_runtime_initialize()
{
836
    int mpiio_buf_size;
837

838 839 840
    /* try and store the default number of records for this module */
    mpiio_buf_size = DARSHAN_DEF_MOD_REC_COUNT * sizeof(struct darshan_mpiio_file);

841 842 843
    /* register the mpiio module with darshan core */
    darshan_core_register_module(
        DARSHAN_MPIIO_MOD,
844
        &mpiio_shutdown,
845
        &mpiio_buf_size,
846
        &my_rank,
847
        NULL);
848

849 850
    /* return if darshan-core does not provide enough module memory */
    if(mpiio_buf_size < sizeof(struct darshan_mpiio_file))
851 852
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
853
        return;
854
    }
855 856 857

    mpiio_runtime = malloc(sizeof(*mpiio_runtime));
    if(!mpiio_runtime)
858 859
    {
        darshan_core_unregister_module(DARSHAN_MPIIO_MOD);
860
        return;
861
    }
862 863
    memset(mpiio_runtime, 0, sizeof(*mpiio_runtime));

864 865 866 867 868
    /* check if DXT (Darshan extended tracing) should be enabled */
    if (getenv("ENABLE_DXT_IO_TRACE")) {
        enable_dxt_io_trace = 1;
    }

869 870 871
    return;
}

872 873
static struct mpiio_file_record_ref *mpiio_track_new_file_record(
    darshan_record_id rec_id, const char *path)
874
{
875 876
    struct darshan_mpiio_file *file_rec = NULL;
    struct mpiio_file_record_ref *rec_ref = NULL;
877
    int ret;
878

879 880
    rec_ref = malloc(sizeof(*rec_ref));
    if(!rec_ref)
881
        return(NULL);
882
    memset(rec_ref, 0, sizeof(*rec_ref));
883

884 885 886 887
    /* 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)
888
    {
889
        free(rec_ref);
890 891 892
        return(NULL);
    }

893 894
    /* register the actual file record with darshan-core so it is persisted
     * in the log file
895
     */
896 897 898 899 900 901
    file_rec = darshan_core_register_record(
        rec_id,
        path,
        DARSHAN_MPIIO_MOD,
        sizeof(struct darshan_mpiio_file),
        NULL);
902

903
    if(!file_rec)
904
    {
905 906 907 908
        darshan_delete_record_ref(&(mpiio_runtime->rec_id_hash),
            &rec_id, sizeof(darshan_record_id));
        free(rec_ref);
        return(NULL);
909 910
    }

911 912 913 914 915 916 917
    /* 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);
918 919
}

920 921 922 923 924 925 926 927 928
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;

    tdestroy(rec_ref->access_root, free);
    return;
}

929 930 931 932 933
static void mpiio_record_reduction_op(
    void* infile_v,
    void* inoutfile_v,
    int *len,
    MPI_Datatype *datatype)
934
{
935 936 937
    struct darshan_mpiio_file tmp_file;
    struct darshan_mpiio_file *infile = infile_v;
    struct darshan_mpiio_file *inoutfile = inoutfile_v;
938
    int i, j, k;
939

940 941 942
    for(i=0; i<*len; i++)
    {
        memset(&tmp_file, 0, sizeof(struct darshan_mpiio_file));
943 944
        tmp_file.base_rec.id = infile->base_rec.id;
        tmp_file.base_rec.rank = -1;
945 946

        /* sum */
947 948 949 950 951 952 953 954 955
        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++)
956 957 958 959
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985
        /* 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],
986
                infile->counters[j+4], 0);
987 988 989 990
        }

        /* second set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
991
        {
992 993
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), inoutfile->counters[j],
994
                inoutfile->counters[j+4], 0);
995 996 997
        }

        /* min non-zero (if available) value */
998
        for(j=MPIIO_F_OPEN_TIMESTAMP; j<=MPIIO_F_WRITE_START_TIMESTAMP; j++)
999
        {
1000 1001
            if((infile->fcounters[j] < inoutfile->fcounters[j] &&
               infile->fcounters[j] > 0) || inoutfile->fcounters[j] == 0)
1002
                tmp_file.fcounters[j] = infile->fcounters[j];
1003 1004
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
1005 1006
        }

1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
        /* 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++)
        {
1019
            tmp_file.fcounters[j] = infile->fcounters[j] + inoutfile->fcounters[j];
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
        }

        /* 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];
        }

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 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
        /* 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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    instrumentation_disabled = 0;
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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;
    }

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    free(fh_array);
    free(size_array);

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    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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    /* disable further instrumentation while we shutdown */
    instrumentation_disabled = 1;

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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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    MPIIO_UNLOCK();
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    return;
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}

Philip Carns's avatar
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
 */