darshan-logutils.c 22.4 KB
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/*
 *  (C) 2009 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

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#include <stdio.h>
#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "darshan-logutils.h"

/* isn't there a clever c way to avoid this? */
char *darshan_names[] = {
    "CP_INDEP_OPENS",
    "CP_COLL_OPENS",               /* count of MPI collective opens */
    "CP_INDEP_READS",              /* count of independent MPI reads */
    "CP_INDEP_WRITES",             /* count of independent MPI writes */
    "CP_COLL_READS",               /* count of collective MPI reads */
    "CP_COLL_WRITES",              /* count of collective MPI writes */
    "CP_SPLIT_READS",              /* count of split collective MPI reads */
    "CP_SPLIT_WRITES",             /* count of split collective MPI writes */
    "CP_NB_READS",                 /* count of nonblocking MPI reads */
    "CP_NB_WRITES",                /* count of nonblocking MPI writes */
    "CP_SYNCS",                    /* count of MPI_File_sync */
    "CP_POSIX_READS",              /* count of posix reads */
    "CP_POSIX_WRITES",             /* count of posix writes */
    "CP_POSIX_OPENS",              /* count of posix opens */
    "CP_POSIX_SEEKS",              /* count of posix seeks */
    "CP_POSIX_STATS",              /* count of posix stat/lstat/fstats */
    "CP_POSIX_MMAPS",              /* count of posix mmaps */
    "CP_POSIX_FREADS",
    "CP_POSIX_FWRITES",
    "CP_POSIX_FOPENS",
    "CP_POSIX_FSEEKS",
    "CP_POSIX_FSYNCS",
    "CP_POSIX_FDSYNCS",
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    "CP_INDEP_NC_OPENS",
    "CP_COLL_NC_OPENS",
    "CP_HDF5_OPENS",
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    "CP_COMBINER_NAMED",           /* count of each MPI datatype category */
    "CP_COMBINER_DUP",
    "CP_COMBINER_CONTIGUOUS",
    "CP_COMBINER_VECTOR",
    "CP_COMBINER_HVECTOR_INTEGER",
    "CP_COMBINER_HVECTOR",
    "CP_COMBINER_INDEXED",
    "CP_COMBINER_HINDEXED_INTEGER",
    "CP_COMBINER_HINDEXED",
    "CP_COMBINER_INDEXED_BLOCK",
    "CP_COMBINER_STRUCT_INTEGER",
    "CP_COMBINER_STRUCT",
    "CP_COMBINER_SUBARRAY",
    "CP_COMBINER_DARRAY",
    "CP_COMBINER_F90_REAL",
    "CP_COMBINER_F90_COMPLEX",
    "CP_COMBINER_F90_INTEGER",
    "CP_COMBINER_RESIZED",
    "CP_HINTS",                     /* count of MPI hints used */
    "CP_VIEWS",                     /* count of MPI set view calls */
    "CP_MODE",                      /* mode of file */
    "CP_BYTES_READ",                /* total bytes read */
    "CP_BYTES_WRITTEN",             /* total bytes written */
    "CP_MAX_BYTE_READ",             /* highest offset byte read */
    "CP_MAX_BYTE_WRITTEN",          /* highest offset byte written */
    "CP_CONSEC_READS",              /* count of consecutive reads */
    "CP_CONSEC_WRITES",             /* count of consecutive writes */
    "CP_SEQ_READS",                 /* count of sequential reads */
    "CP_SEQ_WRITES",                /* count of sequential writes */
    "CP_RW_SWITCHES",
    "CP_MEM_NOT_ALIGNED",           /* count of accesses not mem aligned */
    "CP_MEM_ALIGNMENT",             /* mem alignment in bytes */
    "CP_FILE_NOT_ALIGNED",          /* count of accesses not file aligned */
    "CP_FILE_ALIGNMENT",            /* file alignment in bytes */
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    "CP_MAX_READ_TIME_SIZE",
    "CP_MAX_WRITE_TIME_SIZE",
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    "CP_SIZE_READ_0_100",           /* count of posix read size ranges */
    "CP_SIZE_READ_100_1K",
    "CP_SIZE_READ_1K_10K",
    "CP_SIZE_READ_10K_100K",
    "CP_SIZE_READ_100K_1M",
    "CP_SIZE_READ_1M_4M",
    "CP_SIZE_READ_4M_10M",
    "CP_SIZE_READ_10M_100M",
    "CP_SIZE_READ_100M_1G",
    "CP_SIZE_READ_1G_PLUS",
    "CP_SIZE_WRITE_0_100",          /* count of posix write size ranges */
    "CP_SIZE_WRITE_100_1K",
    "CP_SIZE_WRITE_1K_10K",
    "CP_SIZE_WRITE_10K_100K",
    "CP_SIZE_WRITE_100K_1M",
    "CP_SIZE_WRITE_1M_4M",
    "CP_SIZE_WRITE_4M_10M",
    "CP_SIZE_WRITE_10M_100M",
    "CP_SIZE_WRITE_100M_1G",
    "CP_SIZE_WRITE_1G_PLUS",
    "CP_SIZE_READ_AGG_0_100",       /* count of MPI read size ranges */
    "CP_SIZE_READ_AGG_100_1K",
    "CP_SIZE_READ_AGG_1K_10K",
    "CP_SIZE_READ_AGG_10K_100K",
    "CP_SIZE_READ_AGG_100K_1M",
    "CP_SIZE_READ_AGG_1M_4M",
    "CP_SIZE_READ_AGG_4M_10M",
    "CP_SIZE_READ_AGG_10M_100M",
    "CP_SIZE_READ_AGG_100M_1G",
    "CP_SIZE_READ_AGG_1G_PLUS",
    "CP_SIZE_WRITE_AGG_0_100",      /* count of MPI write size ranges */
    "CP_SIZE_WRITE_AGG_100_1K",
    "CP_SIZE_WRITE_AGG_1K_10K",
    "CP_SIZE_WRITE_AGG_10K_100K",
    "CP_SIZE_WRITE_AGG_100K_1M",
    "CP_SIZE_WRITE_AGG_1M_4M",
    "CP_SIZE_WRITE_AGG_4M_10M",
    "CP_SIZE_WRITE_AGG_10M_100M",
    "CP_SIZE_WRITE_AGG_100M_1G",
    "CP_SIZE_WRITE_AGG_1G_PLUS",
    "CP_EXTENT_READ_0_100",          /* count of MPI read extent ranges */
    "CP_EXTENT_READ_100_1K",
    "CP_EXTENT_READ_1K_10K",
    "CP_EXTENT_READ_10K_100K",
    "CP_EXTENT_READ_100K_1M",
    "CP_EXTENT_READ_1M_4M",
    "CP_EXTENT_READ_4M_10M",
    "CP_EXTENT_READ_10M_100M",
    "CP_EXTENT_READ_100M_1G",
    "CP_EXTENT_READ_1G_PLUS",
    "CP_EXTENT_WRITE_0_100",         /* count of MPI write extent ranges */
    "CP_EXTENT_WRITE_100_1K",
    "CP_EXTENT_WRITE_1K_10K",
    "CP_EXTENT_WRITE_10K_100K",
    "CP_EXTENT_WRITE_100K_1M",
    "CP_EXTENT_WRITE_1M_4M",
    "CP_EXTENT_WRITE_4M_10M",
    "CP_EXTENT_WRITE_10M_100M",
    "CP_EXTENT_WRITE_100M_1G",
    "CP_EXTENT_WRITE_1G_PLUS",
    "CP_STRIDE1_STRIDE",             /* the four most frequently appearing strides */
    "CP_STRIDE2_STRIDE",
    "CP_STRIDE3_STRIDE",
    "CP_STRIDE4_STRIDE",
    "CP_STRIDE1_COUNT",              /* count of each of the most frequent strides */
    "CP_STRIDE2_COUNT",
    "CP_STRIDE3_COUNT",
    "CP_STRIDE4_COUNT",
    "CP_ACCESS1_ACCESS",
    "CP_ACCESS2_ACCESS",
    "CP_ACCESS3_ACCESS",
    "CP_ACCESS4_ACCESS",
    "CP_ACCESS1_COUNT",
    "CP_ACCESS2_COUNT",
    "CP_ACCESS3_COUNT",
    "CP_ACCESS4_COUNT",
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    "CP_DEVICE",
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    "CP_SIZE_AT_OPEN",
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    "CP_NUM_INDICES"
};

/* isn't there a clever c way to avoid this? */
char *darshan_f_names[] = {
    "CP_F_OPEN_TIMESTAMP",        /* timestamp of first open */
    "CP_F_READ_START_TIMESTAMP",  /* timestamp of first read */
    "CP_F_WRITE_START_TIMESTAMP", /* timestamp of first write */
    "CP_F_CLOSE_TIMESTAMP",       /* timestamp of last close */
    "CP_F_READ_END_TIMESTAMP",    /* timestamp of last read */
    "CP_F_WRITE_END_TIMESTAMP",   /* timestamp of last write */
    "CP_F_POSIX_READ_TIME",       /* cumulative posix read time */
    "CP_F_POSIX_WRITE_TIME",      /* cumulative posix write time */
    "CP_F_POSIX_META_TIME",       /* cumulative posix meta time */
    "CP_F_MPI_META_TIME",         /* cumulative mpi-io metadata time */
    "CP_F_MPI_READ_TIME",         /* cumulative mpi-io read time */
    "CP_F_MPI_WRITE_TIME",        /* cumulative mpi-io write time */
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    "CP_F_MAX_READ_TIME",
    "CP_F_MAX_WRITE_TIME",
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    "CP_F_NUM_INDICES",
};

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/*******************************
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 * version 1.22 to 1.23 differences
 *
 * - added:
 *   - CP_DEVICE
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 *   - CP_SIZE_AT_OPEN
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 * - changed params:
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 *   - CP_FILE_RECORD_SIZE: 1240 to 1248
 *   - CP_NUM_INDICES: 138 to 140
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 */
#define CP_NUM_INDICES_1_22 138
struct darshan_file_1_22
{
    uint64_t hash;
    int rank;
    int64_t counters[CP_NUM_INDICES_1_22];
    double fcounters[CP_F_NUM_INDICES];
    char name_suffix[CP_NAME_SUFFIX_LEN+1];
};

static void shift_missing_1_22(struct darshan_file* file);


/*******************************
 * version 1.21 to 1.23 differences 
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 * - added:
 *   - CP_INDEP_NC_OPENS
 *   - CP_COLL_NC_OPENS
 *   - CP_HDF5_OPENS
 *   - CP_MAX_READ_TIME_SIZE
 *   - CP_MAX_WRITE_TIME_SIZE
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 *   - CP_DEVICE
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 *   - CP_SIZE_AT_OPEN
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 *   - CP_F_MAX_READ_TIME
 *   - CP_F_MAX_WRITE_TIME
 * - changed params:
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 *   - CP_FILE_RECORD_SIZE: 1184 to 1248
 *   - CP_NUM_INDICES: 133 to 140
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 *   - CP_F_NUM_INDICES: 12 to 14
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 * - so 60 bytes worth of new indices are the only difference
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 */
#define CP_NUM_INDICES_1_21 133
#define CP_F_NUM_INDICES_1_21 12
struct darshan_file_1_21
{
    uint64_t hash;
    int rank;
    int64_t counters[CP_NUM_INDICES_1_21];
    double fcounters[CP_F_NUM_INDICES_1_21];
    char name_suffix[CP_NAME_SUFFIX_LEN+1];
};

static void shift_missing_1_21(struct darshan_file* file);

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/* function pointers so that we can switch functions depending on what file
 * version is detected
 */
int (*getjob_internal)(darshan_fd file, struct darshan_job *job);
int (*getfile_internal)(darshan_fd fd, 
    struct darshan_job *job, 
    struct darshan_file *file);

static int getjob_internal_200(darshan_fd file, struct darshan_job *job);
static int getfile_internal_200(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getjob_internal_124(darshan_fd file, struct darshan_job *job);
static int getfile_internal_124(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_122(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_121(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);

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/* a rather crude API for accessing raw binary darshan files */
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darshan_fd darshan_log_open(const char *name)
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{
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    darshan_fd tmp_fd = malloc(sizeof(*tmp_fd));
    if(!tmp_fd)
        return(NULL);

    memset(tmp_fd, 0, sizeof(*tmp_fd));

    tmp_fd->gzf = gzopen(name, "r");
    if(!tmp_fd->gzf)
    {
        free(tmp_fd);
        tmp_fd = NULL;
    }
    return tmp_fd;
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}

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/* darshan_log_getjob()
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 *
 * returns 0 on success, -1 on failure
 */
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int darshan_log_getjob(darshan_fd file, struct darshan_job *job)
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{
    int ret;
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    gzseek(file->gzf, 0, SEEK_SET);
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    /* read version number first so we know how to digest the rest of the
     * file
     */
    ret = gzread(file->gzf, file->version, 10);
    if(ret < 10)
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    {
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        fprintf(stderr, "Error: invalid log file (failed to read version).\n");
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        return(-1);
    }

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    if(strcmp(file->version, "2.00") == 0)
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    {
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        getjob_internal = getjob_internal_200;
        getfile_internal = getfile_internal_200;
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    }
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    else if(strcmp(file->version, "1.24") == 0)
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    {
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        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_124;
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    }
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    else if(strcmp(file->version, "1.23") == 0)
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    {
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        /* same as 1.24, except that mnt points may be incorrect */
        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_124;
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    }
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    else if(strcmp(file->version, "1.22") == 0)
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    {
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        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_122;
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    }
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    else if(strcmp(file->version, "1.21") == 0)
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    {
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        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_122;
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    }
    else
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    {
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        fprintf(stderr, "Error: incompatible darshan file.\n");
        fprintf(stderr, "Error: expected version %s, but got %s\n", 
                CP_VERSION, file->version);
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        return(-1);
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    }

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    ret = getjob_internal(file, job);
    return(ret);
}
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/* darshan_log_getfile()
 *
 * return 1 if file record found, 0 on eof, and -1 on error
 */
int darshan_log_getfile(darshan_fd fd, struct darshan_job *job, struct darshan_file *file)
{
    int ret;
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    ret = getfile_internal(fd, job, file);

    return(ret);
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}

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/* darshan_log_getmounts()
 * 
 * retrieves mount table information from the log.  Note that devs, mnt_pts,
 * and fs_types are arrays that will be allocated by the function and must
 * be freed by the caller.  count will indicate the size of the arrays
 */
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int darshan_log_getmounts(darshan_fd fd, int64_t** devs, char*** mnt_pts, char***
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    fs_types, int* count, int *flag)
{
    int ret;
    char* pos;
    int array_index = 0;
    char buf[CP_EXE_LEN+1];

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    gzseek(fd->gzf, sizeof(struct darshan_job), SEEK_SET);
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    ret = gzread(fd->gzf, buf, (CP_EXE_LEN + 1));
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    if (ret < (CP_EXE_LEN + 1))
    {
        perror("gzread");
        return(-1);
    }
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    if (gzeof(fd->gzf))
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        *flag = 1;
    else
        *flag = 0;

    /* count entries */
    *count = 0;
    pos = buf;
    while((pos = strchr(pos, '\n')) != NULL)
    {
        pos++;
        (*count)++;
    }

    if(*count == 0)
    {
        /* no mount entries present */
        return(0);
    }

    /* allocate output arrays */
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    *devs = malloc((*count)*sizeof(int64_t));
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    assert(*devs);
    *mnt_pts = malloc((*count)*sizeof(char*));
    assert(*mnt_pts);
    *fs_types = malloc((*count)*sizeof(char*));
    assert(*fs_types);
    
    /* work backwards through the table and parse each line (except for
     * first, which holds command line information)
     */
    while((pos = strrchr(buf, '\n')) != NULL)
    {
        /* overestimate string lengths */
        (*mnt_pts)[array_index] = malloc(CP_EXE_LEN);
        assert((*mnt_pts)[array_index]);
        (*fs_types)[array_index] = malloc(CP_EXE_LEN);
        assert((*fs_types)[array_index]);
        
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#if SIZEOF_LONG_INT == 4
        ret = sscanf(++pos, "%lld\t%s\t%s", &(*devs)[array_index],
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            (*fs_types)[array_index], (*mnt_pts)[array_index]);
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#elif SIZEOF_LONG_INT == 8
        ret = sscanf(++pos, "%ld\t%s\t%s", &(*devs)[array_index],
            (*fs_types)[array_index], (*mnt_pts)[array_index]);
#else
#  error Unexpected sizeof(long int)
#endif

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        if(ret != 3)
        {
            fprintf(stderr, "Error: poorly formatted mount table in log file.\n");
            return(-1);
        }
        pos--;
        *pos = '\0';
        array_index++;
    }
   
    return (0);
}


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int darshan_log_getexe(darshan_fd fd, char *buf, int *flag)
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{
    int ret;
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    char* newline;
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    gzseek(fd->gzf, sizeof(struct darshan_job), SEEK_SET);
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    ret = gzread(fd->gzf, buf, (CP_EXE_LEN + 1));
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    if (ret < (CP_EXE_LEN + 1))
    {
        perror("gzread");
        return(-1);
    }
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    if (gzeof(fd->gzf))
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        *flag = 1;
    else
        *flag = 0;

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    /* this call is only supposed to return the exe string, but starting in
     * log format 1.23 there could be a table of mount entry information
     * after the exe.  Look for newline character and truncate there.
     */
    newline = strchr(buf, '\n');
    if(newline)
        *newline = '\0';

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    return (0);
}

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void darshan_log_close(darshan_fd file)
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{
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    gzclose(file->gzf);
    free(file);
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}

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/* darshan_log_print_version_warnings()
 *
 * Print summary of any problems with the detected log format
 */
void darshan_log_print_version_warnings(struct darshan_job *job)
{
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    if(strcmp(job->version_string, "2.00") == 0)
    {
        /* current version */
        return;
    }
 
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    if(strcmp(job->version_string, "1.24") == 0)
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    {
        return;
    }
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    if(strcmp(job->version_string, "1.23") == 0)
    {
        printf("# WARNING: version 1.23 log format may have incorrect mount point mappings for files with rank > 0\n");
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        return;
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    }

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    if(strcmp(job->version_string, "1.22") == 0)
    {
        printf("# WARNING: version 1.22 log format does not support the following parameters:\n");
        printf("#   CP_DEVICE\n");
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        printf("#   CP_SIZE_AT_OPEN\n");
        printf("# It does not record mounted file systems, mount points, or fs types.\n");
        printf("# It also attributes syncs to cumulative metadata time, rather than cumulative write time.\n");
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        return;
    }
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    if(strcmp(job->version_string, "1.21") == 0)
    {
        printf("# WARNING: version 1.21 log format does not support the following parameters:\n");
        printf("#   CP_INDEP_NC_OPENS\n");
        printf("#   CP_COLL_NC_OPENS\n");
        printf("#   CP_HDF5_OPENS\n");
        printf("#   CP_MAX_READ_TIME_SIZE\n");
        printf("#   CP_MAX_WRITE_TIME_SIZE\n");
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        printf("#   CP_DEVICE\n");
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        printf("#   CP_SIZE_AT_OPEN\n");
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        printf("#   CP_F_MAX_READ_TIME\n");
        printf("#   CP_F_MAX_WRITE_TIME\n");
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        printf("# It also does not record mounted file systems, mount points, or fs types.\n");
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        printf("# It also attributes syncs to cumulative metadata time, rather than cumulative write time.\n");
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        printf("#\n");
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        return;
    }

    fprintf(stderr, "Error: version %s not supported by parser.\n",
        job->version_string);
    return;
}

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/* shift_missing_1_21()
 *
 * translates indices to account for counters that weren't present in log
 * format 1.21
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 */
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static void shift_missing_1_21(struct darshan_file* file)
{
    int c_index = 0;
    int missing_counters[] = {
        CP_INDEP_NC_OPENS,
        CP_COLL_NC_OPENS,
        CP_HDF5_OPENS,
        CP_MAX_READ_TIME_SIZE,
        CP_MAX_WRITE_TIME_SIZE,
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        CP_DEVICE,
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        CP_SIZE_AT_OPEN,
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        -1};
    int missing_f_counters[] = {
        CP_F_MAX_READ_TIME,
        CP_F_MAX_WRITE_TIME,
        -1};

    c_index = 0;
    while(missing_counters[c_index] != -1)
    {
        int missing_counter = missing_counters[c_index];
        c_index++;
        if(missing_counter < (CP_NUM_INDICES - 1))
        {
            /* shift down */
            memmove(&file->counters[missing_counter+1],
                &file->counters[missing_counter],
                (CP_NUM_INDICES-missing_counter-1)*sizeof(int64_t));
        }
        /* zero out missing counter */
        file->counters[missing_counter] = 0;
    }

    c_index = 0;
    while(missing_f_counters[c_index] != -1)
    {
        int missing_counter = missing_f_counters[c_index];
        c_index++;
        if(missing_counter < (CP_F_NUM_INDICES - 1))
        {
            /* shift down */
            memmove(&file->fcounters[missing_counter+1],
                &file->fcounters[missing_counter],
                (CP_F_NUM_INDICES-missing_counter-1)*sizeof(double));
        }
        /* zero out missing counter */
        file->fcounters[missing_counter] = 0;
    }

    return;
}
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/* shift_missing_1_22()
 *
 * translates indices to account for counters that weren't present in log
 * format 1.22
 */
static void shift_missing_1_22(struct darshan_file* file)
{
    int c_index = 0;
    int missing_counters[] = {
        CP_DEVICE,
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        CP_SIZE_AT_OPEN,
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        -1};

    c_index = 0;
    while(missing_counters[c_index] != -1)
    {
        int missing_counter = missing_counters[c_index];
        c_index++;
        if(missing_counter < (CP_NUM_INDICES - 1))
        {
            /* shift down */
            memmove(&file->counters[missing_counter+1],
                &file->counters[missing_counter],
                (CP_NUM_INDICES-missing_counter-1)*sizeof(int64_t));
        }
        /* zero out missing counter */
        file->counters[missing_counter] = 0;
    }

    return;
}
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765

static int getjob_internal_200(darshan_fd file, struct darshan_job *job)
{
    int ret;

    gzseek(file->gzf, 0, SEEK_SET);

    ret = gzread(file->gzf, job, sizeof(*job));
    if (ret < sizeof(*job))
    {
        if(gzeof(file->gzf))
        {
            fprintf(stderr, "Error: invalid log file (too short).\n");
        }
        perror("darshan_job_init");
        return(-1);
    }

    if(job->magic_nr == CP_MAGIC_NR)
    {
        /* no byte swapping needed, this file is in host format already */
        file->swap_flag = 0;
        return(0);
    }

    /* try byte swapping */
    DARSHAN_BSWAP64(&job->magic_nr);
    if(job->magic_nr == CP_MAGIC_NR)
    {
        file->swap_flag = 1;
        DARSHAN_BSWAP64(&job->uid);
        DARSHAN_BSWAP64(&job->start_time);
        DARSHAN_BSWAP64(&job->end_time);
        DARSHAN_BSWAP64(&job->nprocs);
        return(0);
    }

    /* otherwise this file is just broken */
    fprintf(stderr, "Error: bad magic number in darshan file.\n");
    return(-1);
}

static int getfile_internal_200(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file)
{
    int ret;
    const char* err_string;
    struct darshan_file_1_21 file_1_21;
    struct darshan_file_1_22 file_1_22;
    int i;
    
    if(gztell(fd->gzf) < CP_JOB_RECORD_SIZE)
        gzseek(fd->gzf, CP_JOB_RECORD_SIZE, SEEK_SET);

    /* reset file record, so that diff compares against a zero'd out record
     * if file is missing
     */
    memset(file, 0, sizeof(&file));

    ret = gzread(fd->gzf, file, sizeof(*file));
    if(ret == sizeof(*file))
    {
        /* got exactly one, correct size record */
        if(fd->swap_flag)
        {
            /* swap bytes if necessary */
            DARSHAN_BSWAP64(&file->hash);
            DARSHAN_BSWAP64(&file->rank);
            for(i=0; i<CP_NUM_INDICES; i++)
                DARSHAN_BSWAP64(&file->counters[i]);
            for(i=0; i<CP_F_NUM_INDICES; i++)
                DARSHAN_BSWAP64(&file->fcounters[i]);
        }
        return(1);
    }


    if(ret > 0)
    {
        /* got a short read */
        fprintf(stderr, "Error: invalid file record (too small)\n");
        return(-1);
    }

    if(ret == 0 && gzeof(fd->gzf))
    {
        /* hit end of file */
        return(0);
    }

    /* all other errors */
    err_string = gzerror(fd->gzf, &ret);
    fprintf(stderr, "Error: %s\n", err_string);
    return(-1);
}

static int getjob_internal_124(darshan_fd fd, struct darshan_job *job)
{
    return(-1);
}

static int getfile_internal_124(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file)
{

    return(-1);
}

static int getfile_internal_122(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file)
{
#if 0
    else if(strcmp(job->version_string, "1.22") == 0)
    {
        ret = gzread(fd->gzf, &file_1_22, sizeof(file_1_22));
        if(ret == sizeof(file_1_22))
        {
            /* convert to new file record structure */
            file->hash = file_1_22.hash;
            file->rank = file_1_22.rank;
            strcpy(file->name_suffix, file_1_22.name_suffix);
            memcpy(file->counters, file_1_22.counters,
                (CP_NUM_INDICES_1_22*sizeof(int64_t)));
            memcpy(file->fcounters, file_1_22.fcounters,
                (CP_F_NUM_INDICES*sizeof(double)));
            shift_missing_1_22(file);

            /* got exactly one, correct size record */
            return(1);
        }
    }
#endif
    return(-1);
}

static int getfile_internal_121(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file)
{   
#if 0
    if(strcmp(job->version_string, "1.21") == 0)
    {
        ret = gzread(fd->gzf, &file_1_21, sizeof(file_1_21));
        if(ret == sizeof(file_1_21))
        {
            /* convert to new file record structure */
            file->hash = file_1_21.hash;
            file->rank = file_1_21.rank;
            strcpy(file->name_suffix, file_1_21.name_suffix);
            memcpy(file->counters, file_1_21.counters,
                (CP_NUM_INDICES_1_21*sizeof(int64_t)));
            memcpy(file->fcounters, file_1_21.fcounters,
                (CP_F_NUM_INDICES_1_21*sizeof(double)));
            shift_missing_1_21(file);

            /* got exactly one, correct size record */
            return(1);
        }
    }
#endif
    return(-1);
}