darshan-mpiio.c 49.1 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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 */

#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>
#define __USE_GNU
#include <pthread.h>

#include "uthash.h"
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#include "darshan.h"
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#include "darshan-dynamic.h"
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/* The mpiio_file_runtime structure maintains necessary runtime metadata
 * for the MPIIO file record (darshan_mpiio_file structure, defined in
 * darshan-mpiio-log-format.h) pointed to by 'file_record'. This metadata
 * assists with the instrumenting of specific statistics in the file record.
 * 'hlink' is a hash table link structure used to add/remove this record
 * from the hash table of MPIIO file records for this process. 
 *
 * 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
 * the final darshan log file.  We therefore associate a mpiio_file_runtime
 * struct with each darshan_mpiio_file struct in order to track this information.
  *
 * NOTE: There is a one-to-one mapping of mpiio_file_runtime structs to
 * darshan_mpiio_file structs.
 *
 * NOTE: The mpiio_file_runtime struct contains a pointer to a darshan_mpiio_file
 * struct (see the *file_record member) rather than simply embedding an entire
 * darshan_mpiio_file struct.  This is done so that all of the darshan_mpiio_file
 * structs can be kept contiguous in memory as a single array to simplify
 * reduction, compression, and storage.
 */
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struct mpiio_file_runtime
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{
    struct darshan_mpiio_file* file_record;
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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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    UT_hash_handle hlink;
};

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/* The mpiio_file_runtime_ref structure is used to associate a MPIIO
 * file handle with an already existing MPIIO file record. This is
 * necessary as many MPIIO I/O functions take only a file handle as input,
 * but MPIIO file records are indexed by their full file paths (i.e., darshan
 * record identifiers for MPIIO files are created by hashing the file path).
 * In other words, this structure is necessary as it allows us to look up a
 * file record either by a pathname (mpiio_file_runtime) or by MPIIO file
 * descriptor (mpiio_file_runtime_ref), depending on which parameters are
 * available. This structure includes another hash table link, since separate
 * hashes are maintained for mpiio_file_runtime structures and mpiio_file_runtime_ref
 * structures.
 *
 * RATIONALE: In theory the file handle information could be included in the
 * mpiio_file_runtime struct rather than in a separate structure here.  The
 * reason we don't do that is to handle the potential for an MPI implementation
 * to produce a new file handle instance each time MPI_File_open() is called on a
 * file.  Thus there might be multiple file handles referring to the same
 * underlying record.
 *
 * NOTE: there are potentially multiple mpiio_file_runtime_ref structures
 * referring to a single mpiio_file_runtime structure.  Most of the time there is
 * only one, however.
 */
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struct mpiio_file_runtime_ref
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{
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    struct mpiio_file_runtime* file;
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    MPI_File fh;
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    UT_hash_handle hlink;
};

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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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    struct mpiio_file_runtime* file_runtime_array;
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    struct darshan_mpiio_file* file_record_array;
    int file_array_size;
    int file_array_ndx;
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    struct mpiio_file_runtime* file_hash;
    struct mpiio_file_runtime_ref* fh_hash;
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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 void mpiio_runtime_initialize(void);
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static struct mpiio_file_runtime* mpiio_file_by_name(const char *name);
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static struct mpiio_file_runtime* mpiio_file_by_name_setfh(const char* name, MPI_File fh);
static struct mpiio_file_runtime* mpiio_file_by_fh(MPI_File fh);
static void mpiio_file_close_fh(MPI_File fh);
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static int mpiio_record_compare(const void* a, const void* b);
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static void mpiio_record_reduction_op(void* infile_v, void* inoutfile_v,
    int *len, MPI_Datatype *datatype);
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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);
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static void mpiio_begin_shutdown(void);
static void mpiio_get_output_data(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 void mpiio_shutdown(void);

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

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#define MPIIO_RECORD_OPEN(__ret, __path, __fh, __comm, __mode, __info, __tm1, __tm2) do { \
    struct mpiio_file_runtime* file; \
    char *exclude; \
    int tmp_index = 0; \
    int comm_size; \
    if(__ret != MPI_SUCCESS) break; \
    while((exclude=darshan_path_exclusions[tmp_index])) { \
        if(!(strncmp(exclude, __path, strlen(exclude)))) \
            break; \
        tmp_index++; \
    } \
    if(exclude) break; \
    file = mpiio_file_by_name_setfh(__path, __fh); \
    if(!file) break; \
    file->file_record->counters[MPIIO_MODE] = __mode; \
    DARSHAN_MPI_CALL(PMPI_Comm_size)(__comm, &comm_size); \
    if(comm_size == 1) \
        file->file_record->counters[MPIIO_INDEP_OPENS] += 1; \
    else \
        file->file_record->counters[MPIIO_COLL_OPENS] += 1; \
    if(__info != MPI_INFO_NULL) \
        file->file_record->counters[MPIIO_HINTS] += 1; \
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    if(file->file_record->fcounters[MPIIO_F_OPEN_TIMESTAMP] == 0 || \
     file->file_record->fcounters[MPIIO_F_OPEN_TIMESTAMP] > __tm1) \
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        file->file_record->fcounters[MPIIO_F_OPEN_TIMESTAMP] = __tm1; \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[MPIIO_F_META_TIME], __tm1, __tm2, file->last_meta_end); \
} while(0)

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#define MPIIO_RECORD_READ(__ret, __fh, __count, __datatype, __counter, __tm1, __tm2) do { \
    struct mpiio_file_runtime* file; \
    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
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    if(__ret != MPI_SUCCESS) break; \
    file = mpiio_file_by_fh(__fh); \
    if(!file) break; \
    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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    DARSHAN_BUCKET_INC(&(file->file_record->counters[MPIIO_SIZE_READ_AGG_0_100]), size); \
    darshan_common_val_counter(&file->access_root, &file->access_count, size); \
    file->file_record->counters[MPIIO_BYTES_READ] += size; \
    file->file_record->counters[__counter] += 1; \
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    if(file->last_io_type == DARSHAN_IO_WRITE) \
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        file->file_record->counters[MPIIO_RW_SWITCHES] += 1; \
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    file->last_io_type = DARSHAN_IO_READ; \
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    if(file->file_record->fcounters[MPIIO_F_READ_START_TIMESTAMP] == 0 || \
     file->file_record->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        file->file_record->fcounters[MPIIO_F_READ_START_TIMESTAMP] = __tm1; \
    file->file_record->fcounters[MPIIO_F_READ_END_TIMESTAMP] = __tm2; \
    if(file->file_record->fcounters[MPIIO_F_MAX_READ_TIME] < __elapsed) { \
        file->file_record->fcounters[MPIIO_F_MAX_READ_TIME] = __elapsed; \
        file->file_record->counters[MPIIO_MAX_READ_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[MPIIO_F_READ_TIME], __tm1, __tm2, file->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 { \
    struct mpiio_file_runtime* file; \
    int size = 0; \
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    double __elapsed = __tm2-__tm1; \
    if(__ret != MPI_SUCCESS) break; \
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    file = mpiio_file_by_fh(__fh); \
    if(!file) break; \
    DARSHAN_MPI_CALL(PMPI_Type_size)(__datatype, &size);  \
    size = size * __count; \
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    DARSHAN_BUCKET_INC(&(file->file_record->counters[MPIIO_SIZE_WRITE_AGG_0_100]), size); \
    darshan_common_val_counter(&file->access_root, &file->access_count, size); \
    file->file_record->counters[MPIIO_BYTES_WRITTEN] += size; \
    file->file_record->counters[__counter] += 1; \
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    if(file->last_io_type == DARSHAN_IO_READ) \
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        file->file_record->counters[MPIIO_RW_SWITCHES] += 1; \
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    file->last_io_type = DARSHAN_IO_WRITE; \
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    if(file->file_record->fcounters[MPIIO_F_READ_START_TIMESTAMP] == 0 || \
     file->file_record->fcounters[MPIIO_F_READ_START_TIMESTAMP] > __tm1) \
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        file->file_record->fcounters[MPIIO_F_WRITE_START_TIMESTAMP] = __tm1; \
    file->file_record->fcounters[MPIIO_F_WRITE_END_TIMESTAMP] = __tm2; \
    if(file->file_record->fcounters[MPIIO_F_MAX_WRITE_TIME] < __elapsed) { \
        file->file_record->fcounters[MPIIO_F_MAX_WRITE_TIME] = __elapsed; \
        file->file_record->counters[MPIIO_MAX_WRITE_TIME_SIZE] = size; } \
    DARSHAN_TIMER_INC_NO_OVERLAP(file->file_record->fcounters[MPIIO_F_WRITE_TIME], __tm1, __tm2, file->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;
    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_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_OPEN(ret, filename, (*fh), comm, amode, info, tm1, tm2);
    MPIIO_UNLOCK();
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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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_INDEP_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_INDEP_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_COLL_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_COLL_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

    tm1 = darshan_core_wtime();
    ret = DARSHAN_MPI_CALL(PMPI_File_read_at_all_begin)(fh, offset, buf,
        count, datatype);
    tm2 = darshan_core_wtime();
    
    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}

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

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_SPLIT_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_SPLIT_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_READ(ret, fh, count, datatype, MPIIO_NB_READS, tm1, tm2);
    MPIIO_UNLOCK();
    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();

    MPIIO_LOCK();
    mpiio_runtime_initialize();
    MPIIO_RECORD_WRITE(ret, fh, count, datatype, MPIIO_NB_WRITES, tm1, tm2);
    MPIIO_UNLOCK();
    return(ret);
}
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int MPI_File_sync(MPI_File fh)
{
    int ret;
    struct mpiio_file_runtime* file;
    double tm1, tm2;

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

    if(ret == MPI_SUCCESS)
    {
        MPIIO_LOCK();
        mpiio_runtime_initialize();
        file = mpiio_file_by_fh(fh);
        if(file)
        {
737 738 739 740
            file->file_record->counters[MPIIO_SYNCS] += 1;
            DARSHAN_TIMER_INC_NO_OVERLAP(
                file->file_record->fcounters[MPIIO_F_WRITE_TIME],
                tm1, tm2, file->last_write_end);
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        }
        MPIIO_UNLOCK();
    }

    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;
    struct mpiio_file_runtime* file;
    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)
    {
        MPIIO_LOCK();
        mpiio_runtime_initialize();
        file = mpiio_file_by_fh(fh);
        if(file)
        {
772
            file->file_record->counters[MPIIO_VIEWS] += 1;
773 774
            if(info != MPI_INFO_NULL)
            {
775 776 777 778
                file->file_record->counters[MPIIO_HINTS] += 1;
                DARSHAN_TIMER_INC_NO_OVERLAP(
                    file->file_record->fcounters[MPIIO_F_META_TIME],
                    tm1, tm2, file->last_meta_end);
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           }
        }
        MPIIO_UNLOCK();
    }

    return(ret);
}

787 788 789 790
int MPI_File_close(MPI_File *fh)
{
    int ret;
    struct mpiio_file_runtime* file;
791
    MPI_File tmp_fh = *fh;
792 793 794 795 796 797 798 799
    double tm1, tm2;

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

    MPIIO_LOCK();
    mpiio_runtime_initialize();
800
    file = mpiio_file_by_fh(tmp_fh);
801 802
    if(file)
    {
803 804 805 806 807
        file->file_record->fcounters[MPIIO_F_CLOSE_TIMESTAMP] =
            darshan_core_wtime();
        DARSHAN_TIMER_INC_NO_OVERLAP(
            file->file_record->fcounters[MPIIO_F_META_TIME],
            tm1, tm2, file->last_meta_end);
808
        mpiio_file_close_fh(tmp_fh);
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    }
    MPIIO_UNLOCK();

    return(ret);
}

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

/* initialize data structures and register with darshan-core component */
820 821 822 823 824
static void mpiio_runtime_initialize()
{
    int mem_limit;
    struct darshan_module_funcs mpiio_mod_fns =
    {
825
        .begin_shutdown = &mpiio_begin_shutdown,
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        .get_output_data = &mpiio_get_output_data,
        .shutdown = &mpiio_shutdown
    };

    /* don't do anything if already initialized or instrumenation is disabled */
    if(mpiio_runtime || instrumentation_disabled)
        return;

    /* register the mpiio module with darshan core */
    darshan_core_register_module(
        DARSHAN_MPIIO_MOD,
        &mpiio_mod_fns,
838
        &my_rank,
839 840
        &mem_limit,
        NULL);
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    /* return if no memory assigned by darshan core */
    if(mem_limit == 0)
        return;

    mpiio_runtime = malloc(sizeof(*mpiio_runtime));
    if(!mpiio_runtime)
        return;
    memset(mpiio_runtime, 0, sizeof(*mpiio_runtime));

    /* set maximum number of file records according to max memory limit */
    /* NOTE: maximum number of records is based on the size of a mpiio file record */
    mpiio_runtime->file_array_size = mem_limit / sizeof(struct darshan_mpiio_file);
    mpiio_runtime->file_array_ndx = 0;

    /* allocate array of runtime file records */
    mpiio_runtime->file_runtime_array = malloc(mpiio_runtime->file_array_size *
858
                                               sizeof(struct mpiio_file_runtime));
859 860 861 862 863 864 865 866
    mpiio_runtime->file_record_array = malloc(mpiio_runtime->file_array_size *
                                              sizeof(struct darshan_mpiio_file));
    if(!mpiio_runtime->file_runtime_array || !mpiio_runtime->file_record_array)
    {
        mpiio_runtime->file_array_size = 0;
        return;
    }
    memset(mpiio_runtime->file_runtime_array, 0, mpiio_runtime->file_array_size *
867
           sizeof(struct mpiio_file_runtime));
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    memset(mpiio_runtime->file_record_array, 0, mpiio_runtime->file_array_size *
           sizeof(struct darshan_mpiio_file));

    return;
}

874 875 876 877 878 879
/* get a MPIIO file record for the given file path */
static struct mpiio_file_runtime* mpiio_file_by_name(const char *name)
{
    struct mpiio_file_runtime *file = NULL;
    char *newname = NULL;
    darshan_record_id file_id;
880
    int limit_flag;
881 882 883 884 885 886 887 888

    if(!mpiio_runtime || instrumentation_disabled)
        return(NULL);

    newname = darshan_clean_file_path(name);
    if(!newname)
        newname = (char*)name;

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    limit_flag = (mpiio_runtime->file_array_ndx >= mpiio_runtime->file_array_size);

891 892 893 894 895
    /* get a unique id for this file from darshan core */
    darshan_core_register_record(
        (void*)newname,
        strlen(newname),
        DARSHAN_MPIIO_MOD,
896 897
        1,
        limit_flag,
898 899
        &file_id,
        NULL);
900

901 902
    /* the file record id is set to 0 if no memory is available for tracking
     * new records -- just fall through and ignore this record
903 904 905 906 907 908 909 910
     */
    if(file_id == 0)
    {
        if(newname != name)
            free(newname);
        return(NULL);
    }

911 912 913 914 915 916 917 918 919
    /* search the hash table for this file record, and return if found */
    HASH_FIND(hlink, mpiio_runtime->file_hash, &file_id, sizeof(darshan_record_id), file);
    if(file)
    {
        if(newname != name)
            free(newname);
        return(file);
    }

920 921 922 923 924
    /* no existing record, assign a new file record from the global array */
    file = &(mpiio_runtime->file_runtime_array[mpiio_runtime->file_array_ndx]);
    file->file_record = &(mpiio_runtime->file_record_array[mpiio_runtime->file_array_ndx]);
    file->file_record->f_id = file_id;
    file->file_record->rank = my_rank;
925

926 927 928
    /* add new record to file hash table */
    HASH_ADD(hlink, mpiio_runtime->file_hash, file_record->f_id, sizeof(darshan_record_id), file);
    mpiio_runtime->file_array_ndx++;
929 930 931 932 933 934 935 936 937

    if(newname != name)
        free(newname);
    return(file);
}

/* get an MPIIO file record for the given file path, and also create a
 * reference structure using the corresponding file handle
 */
938
static struct mpiio_file_runtime* mpiio_file_by_name_setfh(const char* name, MPI_File fh)
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{
    struct mpiio_file_runtime* file;
    struct mpiio_file_runtime_ref* ref;

    if(!mpiio_runtime || instrumentation_disabled)
        return(NULL);

    /* find file record by name first */
    file = mpiio_file_by_name(name);

    if(!file)
        return(NULL);

    /* search hash table for existing file ref for this fh */
    HASH_FIND(hlink, mpiio_runtime->fh_hash, &fh, sizeof(fh), ref);
    if(ref)
    {
        /* we have a reference.  Make sure it points to the correct file
         * and return it
         */
        ref->file = file;
        return(file);
    }

    /* if we hit this point, then we don't have a reference for this fh
     * in the table yet.  Add it.
     */
    ref = malloc(sizeof(*ref));
    if(!ref)
        return(NULL);
    memset(ref, 0, sizeof(*ref));

    ref->file = file;
    ref->fh = fh;    
    HASH_ADD(hlink, mpiio_runtime->fh_hash, fh, sizeof(fh), ref);

    return(file);
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}

/* get an MPIIO file record for the given file handle */
static struct mpiio_file_runtime* mpiio_file_by_fh(MPI_File fh)
{
    struct mpiio_file_runtime_ref* ref;

    if(!mpiio_runtime || instrumentation_disabled)
        return(NULL);

    /* search hash table for existing file ref for this file handle */
    HASH_FIND(hlink, mpiio_runtime->fh_hash, &fh, sizeof(fh), ref);
    if(ref)
        return(ref->file);

    return(NULL);
}

/* free up reference data structures for the given file handle */
static void mpiio_file_close_fh(MPI_File fh)
{
    struct mpiio_file_runtime_ref* ref;

    if(!mpiio_runtime || instrumentation_disabled)
        return;

    /* search hash table for this fd */
    HASH_FIND(hlink, mpiio_runtime->fh_hash, &fh, sizeof(fh), ref);
    if(ref)
    {
        /* we have a reference, delete it */
        HASH_DELETE(hlink, mpiio_runtime->fh_hash, ref);
        free(ref);
    }

    return;
1012 1013
}

1014
/* compare function for sorting file records by descending rank */
1015
static int mpiio_record_compare(const void* a_p, const void* b_p)
1016
{
1017 1018
    const struct darshan_mpiio_file* a = a_p;
    const struct darshan_mpiio_file* b = b_p;
1019

1020 1021 1022 1023
    if(a->rank < b->rank)
        return 1;
    if(a->rank > b->rank)
        return -1;
1024

1025 1026
    return 0;
}
1027

1028 1029 1030 1031 1032
static void mpiio_record_reduction_op(
    void* infile_v,
    void* inoutfile_v,
    int *len,
    MPI_Datatype *datatype)
1033
{
1034 1035 1036
    struct darshan_mpiio_file tmp_file;
    struct darshan_mpiio_file *infile = infile_v;
    struct darshan_mpiio_file *inoutfile = inoutfile_v;
1037
    int i, j, k;
1038

1039
    assert(mpiio_runtime);
1040

1041 1042 1043 1044 1045 1046 1047 1048
    for(i=0; i<*len; i++)
    {
        memset(&tmp_file, 0, sizeof(struct darshan_mpiio_file));

        tmp_file.f_id = infile->f_id;
        tmp_file.rank = -1;

        /* sum */
1049 1050 1051 1052 1053 1054 1055 1056 1057
        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++)
1058 1059 1060 1061
        {
            tmp_file.counters[j] = infile->counters[j] + inoutfile->counters[j];
        }

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
        /* 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],
                infile->counters[j+4]);
        }

        /* second set */
        for(j=MPIIO_ACCESS1_ACCESS; j<=MPIIO_ACCESS4_ACCESS; j++)
1093
        {
1094 1095 1096
            DARSHAN_COMMON_VAL_COUNTER_INC(&(tmp_file.counters[MPIIO_ACCESS1_ACCESS]),
                &(tmp_file.counters[MPIIO_ACCESS1_COUNT]), inoutfile->counters[j],
                inoutfile->counters[j+4]);
1097 1098 1099
        }

        /* min non-zero (if available) value */
1100
        for(j=MPIIO_F_OPEN_TIMESTAMP; j<=MPIIO_F_WRITE_START_TIMESTAMP; j++)
1101
        {
1102 1103
            if((infile->fcounters[j] < inoutfile->fcounters[j] &&
               infile->fcounters[j] > 0) || inoutfile->fcounters[j] == 0)
1104
                tmp_file.fcounters[j] = infile->fcounters[j];
1105 1106
            else
                tmp_file.fcounters[j] = inoutfile->fcounters[j];
1107 1108
        }

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
        /* 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++)
        {
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            tmp_file.fcounters[j] = infile->fcounters[j] + inoutfile->fcounters[j];
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        }

        /* 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];
        }

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        /* 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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/* 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)
        mpiio_shutdown();

    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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/**************************************************************************
 * Functions exported by MPI-IO module for coordinating with darshan-core *
 **************************************************************************/

static void mpiio_begin_shutdown()
{
    assert(mpiio_runtime);

    MPIIO_LOCK();
    /* disable further instrumentation while Darshan shuts down */
    instrumentation_disabled = 1;
    MPIIO_UNLOCK();

    return;
}

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static void mpiio_get_output_data(
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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_runtime *file;
    struct mpiio_file_runtime* tmp;
    int i;
    double mpiio_time;
    void *red_send_buf = NULL;
    void *red_recv_buf = NULL;
    MPI_Datatype red_type;
    MPI_Op red_op;

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    assert(mpiio_runtime);

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    /* go through and set the 4 most common access sizes for MPI-IO */
    for(i = 0; i < mpiio_runtime->file_array_ndx; i++)
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    {
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        tmp = &(mpiio_runtime->file_runtime_array[i]);

        /* common access sizes */
        darshan_walk_common_vals(tmp->access_root,
            &(tmp->file_record->counters[MPIIO_ACCESS1_ACCESS]),
            &(tmp->file_record->counters[MPIIO_ACCESS1_COUNT]));
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    }
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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++)
        {
            HASH_FIND(hlink, mpiio_runtime->file_hash, &shared_recs[i],
                sizeof(darshan_record_id), file);
            assert(file);

            mpiio_time =
                file->file_record->fcounters[MPIIO_F_READ_TIME] +
                file->file_record->fcounters[MPIIO_F_WRITE_TIME] +
                file->file_record->fcounters[MPIIO_F_META_TIME];

            /* initialize fastest/slowest info prior to the reduction */
            file->file_record->counters[MPIIO_FASTEST_RANK] =
                file->file_record->rank;
            file->file_record->counters[MPIIO_FASTEST_RANK_BYTES] =
                file->file_record->counters[MPIIO_BYTES_READ] +
                file->file_record->counters[MPIIO_BYTES_WRITTEN];
            file->file_record->fcounters[MPIIO_F_FASTEST_RANK_TIME] =
                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.
             */
            file->file_record->counters[MPIIO_SLOWEST_RANK] =
                file->file_record->counters[MPIIO_FASTEST_RANK];
            file->file_record->counters[MPIIO_SLOWEST_RANK_BYTES] =
                file->file_record->counters[MPIIO_FASTEST_RANK_BYTES];
            file->file_record->fcounters[MPIIO_F_SLOWEST_RANK_TIME] =
                file->file_record->fcounters[MPIIO_F_FASTEST_RANK_TIME];

            file->file_record->rank = -1;
        }

        /* sort the array of files descending by rank so that we get all of the 
         * shared files (marked by rank -1) in a contiguous portion at end 
         * of the array
         */
        qsort(mpiio_runtime->file_record_array, mpiio_runtime->file_array_ndx,
            sizeof(struct darshan_mpiio_file), mpiio_record_compare);

        /* make *send_buf point to the shared files at the end of sorted array */
        red_send_buf =
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            &(mpiio_runtime->file_record_array[mpiio_runtime->file_array_ndx-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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                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)
        {
            int tmp_ndx = mpiio_runtime->file_array_ndx - shared_rec_count;
            memcpy(&(mpiio_runtime->file_record_array[tmp_ndx]), red_recv_buf,
                shared_rec_count * sizeof(struct darshan_mpiio_file));
            free(red_recv_buf);
        }
        else
        {
            mpiio_runtime->file_array_ndx -= shared_rec_count;
        }

        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 = (void *)(mpiio_runtime->file_record_array);
    *mpiio_buf_sz = mpiio_runtime->file_array_ndx * sizeof(struct darshan_mpiio_file);
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    return;
}

static void mpiio_shutdown()
{
    struct mpiio_file_runtime_ref *ref, *tmp;

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    assert(mpiio_runtime);

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    HASH_ITER(hlink, mpiio_runtime->fh_hash, ref, tmp)
    {
        HASH_DELETE(hlink, mpiio_runtime->fh_hash, ref);
        free(ref);
    }

    HASH_CLEAR(hlink, mpiio_runtime->file_hash); /* these entries are freed all at once below */

    free(mpiio_runtime->file_runtime_array);
    free(mpiio_runtime->file_record_array);
    free(mpiio_runtime);
    mpiio_runtime = NULL;
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    instrumentation_disabled = 0;
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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
 */