darshan-core.c 67 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
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#define _GNU_SOURCE
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#include "darshan-runtime-config.h"

#include <stdio.h>
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
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#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <pthread.h>
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#include <fcntl.h>
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#include <dirent.h>
#include <sys/ioctl.h>
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#include <sys/types.h>
#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/vfs.h>
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#include <zlib.h>
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#include <mpi.h>
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#include <assert.h>
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#include "uthash.h"
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#include "darshan.h"
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#include "darshan-core.h"
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#include "darshan-dynamic.h"
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#ifdef DARSHAN_LUSTRE
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#include <lustre/lustre_user.h>
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#endif
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extern char* __progname;
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extern char* __progname_full;
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/* internal variable delcarations */
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static struct darshan_core_runtime *darshan_core = NULL;
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static pthread_mutex_t darshan_core_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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static int my_rank = -1;
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static int nprocs = -1;
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static int darshan_mem_alignment = 1;
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static long darshan_mod_mem_quota = DARSHAN_MOD_MEM_MAX;
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/* paths prefixed with the following directories are not tracked by darshan */
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char* darshan_path_exclusions[] = {
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    "/etc/",
    "/dev/",
    "/usr/",
    "/bin/",
    "/boot/",
    "/lib/",
    "/opt/",
    "/sbin/",
    "/sys/",
    "/proc/",
    "/var/",
    NULL
};
/* paths prefixed with the following directories are tracked by darshan even if
 * they share a root with a path listed in darshan_path_exclusions
 */
char* darshan_path_inclusions[] = {
    "/var/opt/cray/dws/mounts/",
    NULL
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};

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/* allow users to override the path exclusions */
char** user_darshan_path_exclusions = NULL;

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#ifdef DARSHAN_BGQ
extern void bgq_runtime_initialize();
#endif

/* array of init functions for modules which need to be statically
 * initialized by darshan at startup time
 */
void (*mod_static_init_fns[])(void) =
{
#ifdef DARSHAN_BGQ
    &bgq_runtime_initialize,
#endif
    NULL
};

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#ifdef DARSHAN_LUSTRE
/* XXX need to use extern to get Lustre module's instrumentation function
 * since modules have no way of providing this to darshan-core
 */
extern void darshan_instrument_lustre_file(const char *filepath, int fd);
#endif

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#define DARSHAN_CORE_LOCK() pthread_mutex_lock(&darshan_core_mutex)
#define DARSHAN_CORE_UNLOCK() pthread_mutex_unlock(&darshan_core_mutex)

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/* FS mount information */
#define DARSHAN_MAX_MNTS 64
#define DARSHAN_MAX_MNT_PATH 256
#define DARSHAN_MAX_MNT_TYPE 32
struct mnt_data
{
    char path[DARSHAN_MAX_MNT_PATH];
    char type[DARSHAN_MAX_MNT_TYPE];
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    struct darshan_fs_info fs_info;
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};
static struct mnt_data mnt_data_array[DARSHAN_MAX_MNTS];
static int mnt_data_count = 0;

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/* prototypes for internal helper functions */
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#ifdef __DARSHAN_ENABLE_MMAP_LOGS
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static void *darshan_init_mmap_log(
    struct darshan_core_runtime* core, int jobid);
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#endif
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static void darshan_log_record_hints_and_ver(
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    struct darshan_core_runtime* core);
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static void darshan_get_exe_and_mounts(
    struct darshan_core_runtime *core, int argc, char **argv);
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static void darshan_fs_info_from_path(
    const char *path, struct darshan_fs_info *fs_info);
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static int darshan_add_name_record_ref(
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    struct darshan_core_runtime *core, darshan_record_id rec_id,
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    const char *name, darshan_module_id mod_id);
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static void darshan_get_user_name(
    char *user);
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static void darshan_get_logfile_name(
    char* logfile_name, int jobid, struct tm* start_tm);
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static void darshan_get_shared_records(
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    struct darshan_core_runtime *core, darshan_record_id **shared_recs,
    int *shared_rec_cnt);
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static int darshan_log_open_all(
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    char *logfile_name, MPI_File *log_fh);
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static int darshan_deflate_buffer(
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    void **pointers, int *lengths, int count, char *comp_buf,
    int *comp_buf_length);
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static int darshan_log_write_name_record_hash(
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    MPI_File log_fh, struct darshan_core_runtime *core,
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    uint64_t *inout_off);
static int darshan_log_append_all(
    MPI_File log_fh, struct darshan_core_runtime *core, void *buf,
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    int count, uint64_t *inout_off);
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static void darshan_core_cleanup(
    struct darshan_core_runtime* core);
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/* *********************************** */

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void darshan_core_initialize(int argc, char **argv)
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{
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    struct darshan_core_runtime *init_core = NULL;
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    int internal_timing_flag = 0;
    double init_start, init_time, init_max;
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    char *envstr;
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    char *jobid_str;
    int jobid;
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    int ret;
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    int i;
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    int tmpval;
    double tmpfloat;
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    DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
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    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &my_rank);
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    if(getenv("DARSHAN_INTERNAL_TIMING"))
        internal_timing_flag = 1;

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    if(internal_timing_flag)
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        init_start = DARSHAN_MPI_CALL(PMPI_Wtime)();

    /* setup darshan runtime if darshan is enabled and hasn't been initialized already */
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    if(!getenv("DARSHAN_DISABLE") && !darshan_core)
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    {
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        #if (__DARSHAN_MEM_ALIGNMENT < 1)
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            #error Darshan must be configured with a positive value for --with-mem-align
        #endif
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        envstr = getenv(DARSHAN_MEM_ALIGNMENT_OVERRIDE);
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        if(envstr)
        {
            ret = sscanf(envstr, "%d", &tmpval);
            /* silently ignore if the env variable is set poorly */
            if(ret == 1 && tmpval > 0)
            {
                darshan_mem_alignment = tmpval;
            }
        }
        else
        {
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            darshan_mem_alignment = __DARSHAN_MEM_ALIGNMENT;
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        }

        /* avoid floating point errors on faulty input */
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        if(darshan_mem_alignment < 1)
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        {
            darshan_mem_alignment = 1;
        }
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        /* Use DARSHAN_JOBID_OVERRIDE for the env var for __DARSHAN_JOBID */
        envstr = getenv(DARSHAN_JOBID_OVERRIDE);
        if(!envstr)
        {
            envstr = __DARSHAN_JOBID;
        }

        /* find a job id */
        jobid_str = getenv(envstr);
        if(jobid_str)
        {
            /* in cobalt we can find it in env var */
            ret = sscanf(jobid_str, "%d", &jobid);
        }
        if(!jobid_str || ret != 1)
        {
            /* use pid as fall back */
            jobid = getpid();
        }

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        /* set the memory quota for darshan modules' records */
        envstr = getenv(DARSHAN_MOD_MEM_OVERRIDE);
        if(envstr)
        {
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            ret = sscanf(envstr, "%lf", &tmpfloat);
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            /* silently ignore if the env variable is set poorly */
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            if(ret == 1 && tmpfloat > 0)
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            {
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                darshan_mod_mem_quota = tmpfloat * 1024 * 1024; /* convert from MiB */
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            }
        }

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        /* allocate structure to track darshan core runtime information */
        init_core = malloc(sizeof(*init_core));
        if(init_core)
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        {
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            memset(init_core, 0, sizeof(*init_core));
            init_core->wtime_offset = DARSHAN_MPI_CALL(PMPI_Wtime)();

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        /* TODO: do we alloc new memory as we go or just do everything up front? */

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#ifndef __DARSHAN_ENABLE_MMAP_LOGS
            /* just allocate memory for each log file region */
            init_core->log_hdr_p = malloc(sizeof(struct darshan_header));
            init_core->log_job_p = malloc(sizeof(struct darshan_job));
            init_core->log_exemnt_p = malloc(DARSHAN_EXE_LEN+1);
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            init_core->log_name_p = malloc(DARSHAN_NAME_RECORD_BUF_SIZE);
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            init_core->log_mod_p = malloc(darshan_mod_mem_quota);
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            if(!(init_core->log_hdr_p) || !(init_core->log_job_p) ||
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               !(init_core->log_exemnt_p) || !(init_core->log_name_p) ||
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               !(init_core->log_mod_p))
            {
                free(init_core);
                return;
            }
            /* if allocation succeeds, zero fill memory regions */
            memset(init_core->log_hdr_p, 0, sizeof(struct darshan_header));
            memset(init_core->log_job_p, 0, sizeof(struct darshan_job));
            memset(init_core->log_exemnt_p, 0, DARSHAN_EXE_LEN+1);
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            memset(init_core->log_name_p, 0, DARSHAN_NAME_RECORD_BUF_SIZE);
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            memset(init_core->log_mod_p, 0, darshan_mod_mem_quota);
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#else
            /* if mmap logs are enabled, we need to initialize the mmap region
             * before setting the corresponding log file region pointers
             */
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            void *mmap_p = darshan_init_mmap_log(init_core, jobid);
            if(!mmap_p)
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            {
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                free(init_core);
                return;
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            }

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            /* set the memory pointers for each log file region */
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            init_core->log_hdr_p = (struct darshan_header *)mmap_p;
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            init_core->log_job_p = (struct darshan_job *)
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                ((char *)init_core->log_hdr_p + sizeof(struct darshan_header));
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            init_core->log_exemnt_p = (char *)
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                ((char *)init_core->log_job_p + sizeof(struct darshan_job));
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            init_core->log_name_p = (void *)
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                ((char *)init_core->log_exemnt_p + DARSHAN_EXE_LEN + 1);
            init_core->log_mod_p = (void *)
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                ((char *)init_core->log_name_p + DARSHAN_NAME_RECORD_BUF_SIZE);
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            /* set header fields needed for the mmap log mechanism */
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            init_core->log_hdr_p->comp_type = DARSHAN_NO_COMP;
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            init_core->log_hdr_p->name_map.off =
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                ((char *)init_core->log_name_p - (char *)init_core->log_hdr_p);
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#endif

            /* set known header fields for the log file */
            strcpy(init_core->log_hdr_p->version_string, DARSHAN_LOG_VERSION);
            init_core->log_hdr_p->magic_nr = DARSHAN_MAGIC_NR;
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            /* set known job-level metadata fields for the log file */
            init_core->log_job_p->uid = getuid();
            init_core->log_job_p->start_time = time(NULL);
            init_core->log_job_p->nprocs = nprocs;
            init_core->log_job_p->jobid = (int64_t)jobid;
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            /* if we are using any hints to write the log file, then record those
             * hints with the darshan job information
             */
            darshan_log_record_hints_and_ver(init_core);

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            /* collect information about command line and mounted file systems */
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            darshan_get_exe_and_mounts(init_core, argc, argv);
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            /* if darshan was successfully initialized, set the global pointer
             * and bootstrap any modules with static initialization routines
             */
            DARSHAN_CORE_LOCK();
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            darshan_core = init_core;
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            DARSHAN_CORE_UNLOCK();

            i = 0;
            while(mod_static_init_fns[i])
            {
                (*mod_static_init_fns[i])();
                i++;
            }
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        }
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    }

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    if(internal_timing_flag)
    {
        init_time = DARSHAN_MPI_CALL(PMPI_Wtime)() - init_start;
        DARSHAN_MPI_CALL(PMPI_Reduce)(&init_time, &init_max, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
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        if(my_rank == 0)
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        {
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            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
            fprintf(stderr, "darshan:init\t%d\t%f\n", nprocs, init_max);
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        }
    }

    return;
}

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void darshan_core_shutdown()
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{
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    struct darshan_core_runtime *final_core;
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    int internal_timing_flag = 0;
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    struct tm *start_tm;
    time_t start_time_tmp;
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    int64_t first_start_time;
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    int64_t last_end_time;
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    double start_log_time;
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    double tm_end;
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    double open1 = 0, open2 = 0;
    double job1 = 0, job2 = 0;
    double rec1 = 0, rec2 = 0;
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    double mod1[DARSHAN_MAX_MODS] = {0};
    double mod2[DARSHAN_MAX_MODS] = {0};
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    double header1 = 0, header2 = 0;
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    char *logfile_name;
    int local_mod_use[DARSHAN_MAX_MODS] = {0};
    int global_mod_use_count[DARSHAN_MAX_MODS] = {0};
    darshan_record_id *shared_recs;
    darshan_record_id *mod_shared_recs;
    int shared_rec_cnt = 0;
    int ret = 0;
    int all_ret = 0;
    int i;
    uint64_t gz_fp = 0;
    MPI_File log_fh;
    MPI_Status status;
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    if(getenv("DARSHAN_INTERNAL_TIMING"))
        internal_timing_flag = 1;

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    /* synchronize before getting start time */
    DARSHAN_MPI_CALL(PMPI_Barrier)(MPI_COMM_WORLD);
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    start_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
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    /* disable darhan-core while we shutdown */
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    DARSHAN_CORE_LOCK();
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    if(!darshan_core)
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    {
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        DARSHAN_CORE_UNLOCK();
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        return;
    }
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    final_core = darshan_core;
    darshan_core = NULL;
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    DARSHAN_CORE_UNLOCK();

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#ifdef __DARSHAN_ENABLE_MMAP_LOGS
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    /* remove the temporary mmap log files */
    /* NOTE: this unlink is not immediate as it must wait for the mapping
     * to no longer be referenced, which in our case happens when the
     * executable exits. If the application terminates mid-shutdown, then
     * there will be no mmap files and no final log file.
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     */
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    unlink(final_core->mmap_log_name);
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#endif
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    final_core->log_job_p->end_time = time(NULL);

    /* reduce to report first start and last end time across all ranks at rank 0 */
    DARSHAN_MPI_CALL(PMPI_Reduce)(&final_core->log_job_p->start_time, &first_start_time,
        1, MPI_INT64_T, MPI_MIN, 0, MPI_COMM_WORLD);
    DARSHAN_MPI_CALL(PMPI_Reduce)(&final_core->log_job_p->end_time, &last_end_time,
        1, MPI_INT64_T, MPI_MAX, 0, MPI_COMM_WORLD);
    if(my_rank == 0)
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    {
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        final_core->log_job_p->start_time = first_start_time;
        final_core->log_job_p->end_time = last_end_time;
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    }
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    final_core->comp_buf = malloc(darshan_mod_mem_quota);
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    if(!(final_core->comp_buf))
    {
        darshan_core_cleanup(final_core);
        return;
    }
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    logfile_name = malloc(PATH_MAX);
    if(!logfile_name)
    {
        darshan_core_cleanup(final_core);
        return;
    }

    /* set the log file name on rank 0 */
    if(my_rank == 0)
    {
        /* use human readable start time format in log filename */
        start_time_tmp = final_core->log_job_p->start_time;
        start_tm = localtime(&start_time_tmp);

        darshan_get_logfile_name(logfile_name, final_core->log_job_p->jobid, start_tm);
    }

    /* broadcast log file name */
    DARSHAN_MPI_CALL(PMPI_Bcast)(logfile_name, PATH_MAX, MPI_CHAR, 0,
        MPI_COMM_WORLD);

    if(strlen(logfile_name) == 0)
    {
        /* failed to generate log file name */
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        fprintf(stderr, "darshan library warning: unable to determine log file path\n");
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        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }
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    /* set which modules were registered locally, and call into
     * them to disable further instrumentation and to perform any
     * other pre-shutdown steps
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
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    {
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        if(final_core->mod_array[i])
            local_mod_use[i] = 1;
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    }

    /* reduce the number of times a module was opened globally and bcast to everyone */
    DARSHAN_MPI_CALL(PMPI_Allreduce)(local_mod_use, global_mod_use_count,
        DARSHAN_MAX_MODS, MPI_INT, MPI_SUM, MPI_COMM_WORLD);

    /* get a list of records which are shared across all processes */
    darshan_get_shared_records(final_core, &shared_recs, &shared_rec_cnt);

    if(internal_timing_flag)
        open1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
    /* collectively open the darshan log file */
    ret = darshan_log_open_all(logfile_name, &log_fh);
    if(internal_timing_flag)
        open2 = DARSHAN_MPI_CALL(PMPI_Wtime)();

    /* error out if unable to open log file */
    DARSHAN_MPI_CALL(PMPI_Allreduce)(&ret, &all_ret, 1, MPI_INT,
        MPI_LOR, MPI_COMM_WORLD);
    if(all_ret != 0)
    {
        if(my_rank == 0)
        {
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            fprintf(stderr, "darshan library warning: unable to create log file %s\n",
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                logfile_name);
        }
        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }

    if(internal_timing_flag)
        job1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
    /* rank 0 is responsible for writing the compressed darshan job information */
    if(my_rank == 0)
    {
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        void *pointers[2] = {final_core->log_job_p, final_core->log_exemnt_p};
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        int lengths[2] = {sizeof(struct darshan_job), strlen(final_core->log_exemnt_p)};
        int comp_buf_sz = 0;

        /* compress the job info and the trailing mount/exe data */
        all_ret = darshan_deflate_buffer(pointers, lengths, 2,
            final_core->comp_buf, &comp_buf_sz);
        if(all_ret)
        {
            fprintf(stderr, "darshan library warning: unable to compress job data\n");
            unlink(logfile_name);
        }
        else
        {
            /* write the job information, preallocing space for the log header */
            gz_fp += sizeof(struct darshan_header);
            all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, gz_fp,
                final_core->comp_buf, comp_buf_sz, MPI_BYTE, &status);
            if(all_ret != MPI_SUCCESS)
            {
                fprintf(stderr,
                        "darshan library warning: unable to write job data to log file %s\n",
                        logfile_name);
                unlink(logfile_name);

            }
            gz_fp += comp_buf_sz;
        }
    }

    /* error out if unable to write job information */
    DARSHAN_MPI_CALL(PMPI_Bcast)(&all_ret, 1, MPI_INT, 0, MPI_COMM_WORLD);
    if(all_ret != 0)
    {
        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }
    if(internal_timing_flag)
        job2 = DARSHAN_MPI_CALL(PMPI_Wtime)();

    if(internal_timing_flag)
        rec1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
    /* write the record name->id hash to the log file */
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    final_core->log_hdr_p->name_map.off = gz_fp;
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    ret = darshan_log_write_name_record_hash(log_fh, final_core, &gz_fp);
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    final_core->log_hdr_p->name_map.len = gz_fp - final_core->log_hdr_p->name_map.off;
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    /* error out if unable to write the name record hash */
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    DARSHAN_MPI_CALL(PMPI_Allreduce)(&ret, &all_ret, 1, MPI_INT,
        MPI_LOR, MPI_COMM_WORLD);
    if(all_ret != 0)
    {
        if(my_rank == 0)
        {
            fprintf(stderr,
                "darshan library warning: unable to write record hash to log file %s\n",
                logfile_name);
            unlink(logfile_name);
        }
        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }
    if(internal_timing_flag)
        rec2 = DARSHAN_MPI_CALL(PMPI_Wtime)();

    mod_shared_recs = malloc(shared_rec_cnt * sizeof(darshan_record_id));
    assert(mod_shared_recs);

    /* loop over globally used darshan modules and:
     *      - get final output buffer
     *      - compress (zlib) provided output buffer
     *      - append compressed buffer to log file
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     *      - add module map info (file offset/length) to log header
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     *      - shutdown the module
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
    {
        struct darshan_core_module* this_mod = final_core->mod_array[i];
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        struct darshan_core_name_record_ref *ref = NULL;
573 574 575 576 577 578 579 580 581
        int mod_shared_rec_cnt = 0;
        void* mod_buf = NULL;
        int mod_buf_sz = 0;
        int j;

        if(global_mod_use_count[i] == 0)
        {
            if(my_rank == 0)
            {
582 583
                final_core->log_hdr_p->mod_map[i].off = 0;
                final_core->log_hdr_p->mod_map[i].len = 0;
584 585 586 587 588 589 590
            }
            continue;
        }

        if(internal_timing_flag)
            mod1[i] = DARSHAN_MPI_CALL(PMPI_Wtime)();

591
        /* set the shared record list for this module */
592 593
        for(j = 0; j < shared_rec_cnt; j++)
        {
594
            HASH_FIND(hlink, final_core->name_hash, &shared_recs[j],
595 596 597 598 599 600 601 602 603 604 605
                sizeof(darshan_record_id), ref);
            assert(ref);
            if(DARSHAN_MOD_FLAG_ISSET(ref->global_mod_flags, i))
            {
                mod_shared_recs[mod_shared_rec_cnt++] = shared_recs[j];
            }
        }

        /* if module is registered locally, get the corresponding output buffer
         * 
         * NOTE: this function can be used to run collective operations across
606
         * modules, if there are records shared globally.
607 608 609
         */
        if(this_mod)
        {
610 611
            mod_buf = final_core->mod_array[i]->rec_buf_start;
            mod_buf_sz = final_core->mod_array[i]->rec_buf_p - mod_buf;
612
            this_mod->mod_shutdown_func(MPI_COMM_WORLD, mod_shared_recs,
613 614 615 616
                mod_shared_rec_cnt, &mod_buf, &mod_buf_sz);
        }

        /* append this module's data to the darshan log */
617
        final_core->log_hdr_p->mod_map[i].off = gz_fp;
618
        ret = darshan_log_append_all(log_fh, final_core, mod_buf, mod_buf_sz, &gz_fp);
619 620
        final_core->log_hdr_p->mod_map[i].len =
            gz_fp - final_core->log_hdr_p->mod_map[i].off;
621

622 623 624 625 626 627
        /* XXX: DXT manages its own module memory buffers, so we need to
         * explicitly free them
         */
        if(i == DXT_POSIX_MOD || i == DXT_MPIIO_MOD)
            free(mod_buf);

628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
        /* error out if the log append failed */
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&ret, &all_ret, 1, MPI_INT,
            MPI_LOR, MPI_COMM_WORLD);
        if(all_ret != 0)
        {
            if(my_rank == 0)
            {
                fprintf(stderr,
                    "darshan library warning: unable to write %s module data to log file %s\n",
                    darshan_module_names[i], logfile_name);
                unlink(logfile_name);
            }
            free(logfile_name);
            darshan_core_cleanup(final_core);
            return;
        }

        if(internal_timing_flag)
            mod2[i] = DARSHAN_MPI_CALL(PMPI_Wtime)();
    }

    if(internal_timing_flag)
        header1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
651
    /* write out log header, after running 2 reductions on header variables:
652
     *  1) reduce 'partial_flag' variable to determine which modules ran out
653
     *     of memory for storing data
654 655 656 657 658 659
     *  2) reduce 'mod_ver' array to determine which log format version each
     *     module used for this output log
     */
    if(my_rank == 0)
    {
        /* rank 0 is responsible for writing the log header */
660 661 662 663 664 665 666 667
        final_core->log_hdr_p->comp_type = DARSHAN_ZLIB_COMP;

        DARSHAN_MPI_CALL(PMPI_Reduce)(
            MPI_IN_PLACE, &(final_core->log_hdr_p->partial_flag),
            1, MPI_UINT32_T, MPI_BOR, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(
            MPI_IN_PLACE, &(final_core->log_hdr_p->mod_ver),
            DARSHAN_MAX_MODS, MPI_UINT32_T, MPI_MAX, 0, MPI_COMM_WORLD);
668

669
        all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, 0, final_core->log_hdr_p,
670 671 672 673 674 675 676 677
            sizeof(struct darshan_header), MPI_BYTE, &status);
        if(all_ret != MPI_SUCCESS)
        {
            fprintf(stderr, "darshan library warning: unable to write header to log file %s\n",
                    logfile_name);
            unlink(logfile_name);
        }
    }
678 679 680 681 682 683 684 685 686
    else
    {
        DARSHAN_MPI_CALL(PMPI_Reduce)(
            &(final_core->log_hdr_p->partial_flag), &(final_core->log_hdr_p->partial_flag),
            1, MPI_UINT32_T, MPI_BOR, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(
            &(final_core->log_hdr_p->mod_ver), &(final_core->log_hdr_p->mod_ver),
            DARSHAN_MAX_MODS, MPI_UINT32_T, MPI_MAX, 0, MPI_COMM_WORLD);
    }
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706

    /* error out if unable to write log header */
    DARSHAN_MPI_CALL(PMPI_Bcast)(&all_ret, 1, MPI_INT, 0, MPI_COMM_WORLD);
    if(all_ret != 0)
    {
        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }
    if(internal_timing_flag)
        header2 = DARSHAN_MPI_CALL(PMPI_Wtime)();

    DARSHAN_MPI_CALL(PMPI_File_close)(&log_fh);

    /* if we got this far, there are no errors, so rename from *.darshan_partial
     * to *-<logwritetime>.darshan, which indicates that this log file is
     * complete and ready for analysis
     */
    if(my_rank == 0)
    {
707
        mode_t chmod_mode = S_IRUSR;
708
#ifdef __DARSHAN_GROUP_READABLE_LOGS
709
        chmod_mode |= S_IRGRP;
710
#endif
711 712 713 714

        if(getenv("DARSHAN_LOGFILE"))
        {
            chmod(logfile_name, chmod_mode);
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
        }
        else
        {
            char* tmp_index;
            double end_log_time;
            char* new_logfile_name;

            new_logfile_name = malloc(PATH_MAX);
            if(new_logfile_name)
            {
                new_logfile_name[0] = '\0';
                end_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
                strcat(new_logfile_name, logfile_name);
                tmp_index = strstr(new_logfile_name, ".darshan_partial");
                sprintf(tmp_index, "_%d.darshan", (int)(end_log_time-start_log_time+1));
                rename(logfile_name, new_logfile_name);
                /* set permissions on log file */
732
                chmod(new_logfile_name, chmod_mode);
733 734 735 736 737 738
                free(new_logfile_name);
            }
        }
    }

    free(logfile_name);
739 740
    free(shared_recs);
    free(mod_shared_recs);
741
    darshan_core_cleanup(final_core);
742

743
    if(internal_timing_flag)
744
    {
745 746 747 748 749
        double open_tm, open_slowest;
        double header_tm, header_slowest;
        double job_tm, job_slowest;
        double rec_tm, rec_slowest;
        double mod_tm[DARSHAN_MAX_MODS], mod_slowest[DARSHAN_MAX_MODS];
750 751 752 753
        double all_tm, all_slowest;

        tm_end = DARSHAN_MPI_CALL(PMPI_Wtime)();

754 755 756 757
        open_tm = open2 - open1;
        header_tm = header2 - header1;
        job_tm = job2 - job1;
        rec_tm = rec2 - rec1;
758
        all_tm = tm_end - start_log_time;
759 760 761 762
        for(i = 0;i < DARSHAN_MAX_MODS; i++)
        {
            mod_tm[i] = mod2[i] - mod1[i];
        }
763

764 765 766 767 768 769 770 771
        DARSHAN_MPI_CALL(PMPI_Reduce)(&open_tm, &open_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(&header_tm, &header_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(&job_tm, &job_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(&rec_tm, &rec_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
772 773
        DARSHAN_MPI_CALL(PMPI_Reduce)(&all_tm, &all_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
774 775
        DARSHAN_MPI_CALL(PMPI_Reduce)(mod_tm, mod_slowest, DARSHAN_MAX_MODS,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
776 777 778

        if(my_rank == 0)
        {
779
            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
780 781 782 783 784 785 786 787 788 789
            fprintf(stderr, "darshan:log_open\t%d\t%f\n", nprocs, open_slowest);
            fprintf(stderr, "darshan:job_write\t%d\t%f\n", nprocs, job_slowest);
            fprintf(stderr, "darshan:hash_write\t%d\t%f\n", nprocs, rec_slowest);
            fprintf(stderr, "darshan:header_write\t%d\t%f\n", nprocs, header_slowest);
            for(i = 0; i < DARSHAN_MAX_MODS; i++)
            {
                if(global_mod_use_count[i])
                    fprintf(stderr, "darshan:%s_shutdown\t%d\t%f\n", darshan_module_names[i],
                        nprocs, mod_slowest[i]);
            }
790
            fprintf(stderr, "darshan:core_shutdown\t%d\t%f\n", nprocs, all_slowest);
791
        }
792
    }
793

794 795
    return;
}
796

797
/* *********************************** */
798

799
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
800 801 802 803 804 805 806
static void *darshan_init_mmap_log(struct darshan_core_runtime* core, int jobid)
{
    int ret;
    int mmap_fd;
    int mmap_size;
    int sys_page_size;
    char cuser[L_cuserid] = {0};
807 808 809
    uint64_t hlevel;
    char hname[HOST_NAME_MAX];
    uint64_t logmod;
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
    char *envstr;
    char *mmap_log_path;
    void *mmap_p;

    sys_page_size = sysconf(_SC_PAGESIZE);
    assert(sys_page_size > 0);

    mmap_size = sizeof(struct darshan_header) + DARSHAN_JOB_RECORD_SIZE +
        + DARSHAN_NAME_RECORD_BUF_SIZE + darshan_mod_mem_quota;
    if(mmap_size % sys_page_size)
        mmap_size = ((mmap_size / sys_page_size) + 1) * sys_page_size;

    envstr = getenv(DARSHAN_MMAP_LOG_PATH_OVERRIDE);
    if(envstr)
        mmap_log_path = envstr;
    else
        mmap_log_path = DARSHAN_DEF_MMAP_LOG_PATH;

    darshan_get_user_name(cuser);

830 831 832 833 834 835 836 837 838 839 840 841 842
    /* generate a random number to help differentiate the temporary log */
    /* NOTE: job id is not sufficient for constructing a unique log file name,
     * since a job could be composed of multiple application runs, so we also
     * add a random number component to the log name
     */
    if(my_rank == 0)
    {
        hlevel=DARSHAN_MPI_CALL(PMPI_Wtime)() * 1000000;
        (void)gethostname(hname, sizeof(hname));
        logmod = darshan_hash((void*)hname,strlen(hname),hlevel);
    }
    DARSHAN_MPI_CALL(PMPI_Bcast)(&logmod, 1, MPI_UINT64_T, 0, MPI_COMM_WORLD);

843 844 845 846
    /* construct a unique temporary log file name for this process
     * to write mmap log data to
     */
    snprintf(core->mmap_log_name, PATH_MAX,
847 848
        "/%s/%s_%s_id%d_mmap-log-%" PRIu64 "-%d.darshan",
        mmap_log_path, cuser, __progname, jobid, logmod, my_rank);
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888

    /* create the temporary mmapped darshan log */
    mmap_fd = open(core->mmap_log_name, O_CREAT|O_RDWR|O_EXCL , 0644);
    if(mmap_fd < 0)
    {
        fprintf(stderr, "darshan library warning: "
            "unable to create darshan log file %s\n", core->mmap_log_name);
        return(NULL);
    }

    /* TODO: ftruncate or just zero fill? */
    /* allocate the necessary space in the log file */
    ret = ftruncate(mmap_fd, mmap_size);
    if(ret < 0)
    {
        fprintf(stderr, "darshan library warning: "
            "unable to allocate darshan log file %s\n", core->mmap_log_name);
        close(mmap_fd);
        unlink(core->mmap_log_name);
        return(NULL);
    }

    /* create the memory map for darshan's data structures so they are
     * persisted to file as the application executes
     */
    mmap_p = mmap(NULL, mmap_size, PROT_WRITE, MAP_SHARED, mmap_fd, 0);
    if(mmap_p == MAP_FAILED)
    {
        fprintf(stderr, "darshan library warning: "
            "unable to mmap darshan log file %s\n", core->mmap_log_name);
        close(mmap_fd);
        unlink(core->mmap_log_name);
        return(NULL);
    }

    /* close darshan log file (this does *not* unmap the log file) */
    close(mmap_fd);

    return(mmap_p);
}
889
#endif
890

891
/* record any hints used to write the darshan log in the job data */
892
static void darshan_log_record_hints_and_ver(struct darshan_core_runtime* core)
893 894
{
    char* hints;
895
    char* job_hints;
896 897 898 899 900 901
    int meta_remain = 0;
    char* m;

    /* check environment variable to see if the default MPI file hints have
     * been overridden
     */
902
    hints = getenv(DARSHAN_LOG_HINTS_OVERRIDE);
903 904
    if(!hints)
    {
905
        hints = __DARSHAN_LOG_HINTS;
906 907 908 909 910
    }

    if(!hints || strlen(hints) < 1)
        return;

911 912
    job_hints = strdup(hints);
    if(!job_hints)
913 914 915
        return;

    meta_remain = DARSHAN_JOB_METADATA_LEN -
916
        strlen(core->log_job_p->metadata) - 1;
917 918
    if(meta_remain >= (strlen(PACKAGE_VERSION) + 9))
    {
919
        sprintf(core->log_job_p->metadata, "lib_ver=%s\n", PACKAGE_VERSION);
920 921
        meta_remain -= (strlen(PACKAGE_VERSION) + 9);
    }
922
    if(meta_remain >= (3 + strlen(job_hints)))
923
    {
924
        m = core->log_job_p->metadata + strlen(core->log_job_p->metadata);
925
        /* We have room to store the hints in the metadata portion of
926
         * the job structure.  We just prepend an h= to the hints list.  The
927 928 929
         * metadata parser will ignore = characters that appear in the value
         * portion of the metadata key/value pair.
         */
930
        sprintf(m, "h=%s\n", job_hints);
931
    }
932
    free(job_hints);
933 934 935 936

    return;
}

937 938 939 940 941 942 943 944 945 946 947 948 949 950
static int mnt_data_cmp(const void* a, const void* b)
{
    const struct mnt_data *d_a = (const struct mnt_data*)a;
    const struct mnt_data *d_b = (const struct mnt_data*)b;

    if(strlen(d_a->path) > strlen(d_b->path))
        return(-1);
    else if(strlen(d_a->path) < strlen(d_b->path))
        return(1);
    else
        return(0);
}

/* adds an entry to table of mounted file systems */
951
static void add_entry(char* buf, int* space_left, struct mntent* entry)
952
{
953
    int i;
954 955 956 957
    int ret;
    char tmp_mnt[256];
    struct statfs statfsbuf;

958 959 960 961 962 963 964 965 966 967
    /* avoid adding the same mount points multiple times -- to limit
     * storage space and potential statfs, ioctl, etc calls
     */
    for(i = 0; i < mnt_data_count; i++)
    {
        if((strncmp(mnt_data_array[i].path, entry->mnt_dir, DARSHAN_MAX_MNT_PATH) == 0) &&
           (strncmp(mnt_data_array[i].type, entry->mnt_type, DARSHAN_MAX_MNT_PATH) == 0))
            return;
    }

968 969 970 971 972 973 974 975 976 977 978 979
    strncpy(mnt_data_array[mnt_data_count].path, entry->mnt_dir,
        DARSHAN_MAX_MNT_PATH-1);
    strncpy(mnt_data_array[mnt_data_count].type, entry->mnt_type,
        DARSHAN_MAX_MNT_TYPE-1);
    /* NOTE: we now try to detect the preferred block size for each file 
     * system using fstatfs().  On Lustre we assume a size of 1 MiB 
     * because fstatfs() reports 4 KiB. 
     */
#ifndef LL_SUPER_MAGIC
#define LL_SUPER_MAGIC 0x0BD00BD0
#endif
    ret = statfs(entry->mnt_dir, &statfsbuf);
980
    mnt_data_array[mnt_data_count].fs_info.fs_type = statfsbuf.f_type;
981
    if(ret == 0 && statfsbuf.f_type != LL_SUPER_MAGIC)
982
        mnt_data_array[mnt_data_count].fs_info.block_size = statfsbuf.f_bsize;
983
    else if(ret == 0 && statfsbuf.f_type == LL_SUPER_MAGIC)
984
        mnt_data_array[mnt_data_count].fs_info.block_size = 1024*1024;
985
    else
986
        mnt_data_array[mnt_data_count].fs_info.block_size = 4096;
987

988
#ifdef DARSHAN_LUSTRE
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
    /* attempt to retrieve OST and MDS counts from Lustre */
    mnt_data_array[mnt_data_count].fs_info.ost_count = -1;
    mnt_data_array[mnt_data_count].fs_info.mdt_count = -1;
    if ( statfsbuf.f_type == LL_SUPER_MAGIC )
    {
        int n_ost, n_mdt;
        int ret_ost, ret_mdt;
        DIR *mount_dir;

        mount_dir = opendir( entry->mnt_dir );
        if ( mount_dir  ) 
        {
            /* n_ost and n_mdt are used for both input and output to ioctl */
            n_ost = 0;
            n_mdt = 1;

            ret_ost = ioctl( dirfd(mount_dir), LL_IOC_GETOBDCOUNT, &n_ost );
            ret_mdt = ioctl( dirfd(mount_dir), LL_IOC_GETOBDCOUNT, &n_mdt );

1008
            if ( !(ret_ost < 0 || ret_mdt < 0) )
1009 1010 1011 1012 1013 1014 1015
            {
                mnt_data_array[mnt_data_count].fs_info.ost_count = n_ost;
                mnt_data_array[mnt_data_count].fs_info.mdt_count = n_mdt;
            }
            closedir( mount_dir );
        }
    }
1016
#endif
1017

1018
    /* store mount information with the job-level metadata in darshan log */
1019
    ret = snprintf(tmp_mnt, 256, "\n%s\t%s",
1020 1021 1022
        entry->mnt_type, entry->mnt_dir);
    if(ret < 256 && strlen(tmp_mnt) <= (*space_left))
    {
1023
        strcat(buf, tmp_mnt);
1024 1025 1026 1027 1028 1029 1030
        (*space_left) -= strlen(tmp_mnt);
    }

    mnt_data_count++;
    return;
}

1031
/* darshan_get_exe_and_mounts()
1032 1033
 *
 * collects command line and list of mounted file systems into a string that
1034
 * will be stored with the job-level metadata
1035
 */
1036
static void darshan_get_exe_and_mounts(struct darshan_core_runtime *core,
1037
    int argc, char **argv)
1038 1039 1040 1041
{
    FILE* tab;
    struct mntent *entry;
    char* exclude;
1042 1043 1044
    char* truncate_string = "<TRUNCATED>";
    int truncate_offset;
    int space_left = DARSHAN_EXE_LEN;
1045 1046 1047
    FILE *fh;
    int i, ii;
    char cmdl[DARSHAN_EXE_LEN];
1048 1049
    int tmp_index = 0;
    int skip = 0;
1050 1051 1052
    char* env_exclusions;
    char* string;
    char* token;
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071

    /* skip these fs types */
    static char* fs_exclusions[] = {
        "tmpfs",
        "proc",
        "sysfs",
        "devpts",
        "binfmt_misc",
        "fusectl",
        "debugfs",
        "securityfs",
        "nfsd",
        "none",
        "rpc_pipefs",
        "hugetlbfs",
        "cgroup",
        NULL
    };

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 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
    /* Check if user has set the env variable DARSHAN_EXCLUDE_DIRS */
    env_exclusions = getenv("DARSHAN_EXCLUDE_DIRS");
    if(env_exclusions)
    {
        fs_exclusions[0]=NULL;
        /* if DARSHAN_EXCLUDE_DIRS=none, do not exclude any dir */
        if(strncmp(env_exclusions,"none",strlen(env_exclusions))>=0)
        {
            if (my_rank == 0) 
                fprintf(stderr, "INFO: no system dir will be excluded\n");
            darshan_path_exclusions[0]=NULL;
        }
        else
        {
            if (my_rank == 0) 
                fprintf(stderr, "INFO: darshan will exclude these dirs: %s\n",env_exclusions);
            string = strdupa(env_exclusions);
            i = 0;
            /* get the comma separated number of directories */
            while ((token = strsep(&string, ",")) != NULL)
            {
               i++;
            }
            user_darshan_path_exclusions=(char **)malloc((i+1)*sizeof(char *));
            i = 0;
            string = strdupa(env_exclusions);
            while ((token = strsep(&string, ",")) != NULL)
            {
                user_darshan_path_exclusions[i]=(char *)malloc(strlen(token)+1);
                strcpy(user_darshan_path_exclusions[i],token);
                i++;
            }
            user_darshan_path_exclusions[i]=NULL;
        }
    }

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    /* record exe and arguments */
    for(i=0; i<argc; i++)
    {
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        strncat(core->log_exemnt_p, argv[i], space_left);
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
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        if(i < (argc-1))
        {
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            strncat(core->log_exemnt_p, " ", space_left);
            space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
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        }
    }

    /* if we don't see any arguments, then use glibc symbol to get
     * program name at least (this happens in fortran)
     */
    if(argc == 0)
    {
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        /* get the name of the executable and the arguments from 
           /proc/self/cmdline */

        cmdl[0] = '\0';
        fh = fopen("/proc/self/cmdline","r");
        if(fh) {
            ii = 0;
            fgets(cmdl,DARSHAN_EXE_LEN,fh);
            for(i=1;i<DARSHAN_EXE_LEN;i++)  {
                if(cmdl[i]==0 && ii == 0) {
                  cmdl[i]=' '; ii = 1;
                } else if(cmdl[i]==0 && ii == 1) {
                  break;
                } else {
                  ii = 0;
                }
            }
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            fclose(fh);
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        } else {
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           sprintf(cmdl, "%s <unknown args>", __progname_full);
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        }
        strncat(core->log_exemnt_p, cmdl, space_left);
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        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
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    }

    if(space_left == 0)
    {
        /* we ran out of room; mark that string was truncated */
        truncate_offset = DARSHAN_EXE_LEN - strlen(truncate_string);
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        sprintf(&(core->log_exemnt_p[truncate_offset]), "%s",
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            truncate_string);
    }

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    /* we make two passes through mounted file systems; in the first pass we
     * grab any non-nfs mount points, then on the second pass we grab nfs
     * mount points
     */
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    mnt_data_count = 0;
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    tab = setmntent("/etc/mtab", "r");
    if(!tab)
        return;
    /* loop through list of mounted file systems */
    while(mnt_data_count<DARSHAN_MAX_MNTS && (entry = getmntent(tab)) != NULL)
    {
        /* filter out excluded fs types */
        tmp_index = 0;
        skip = 0;
        while((exclude = fs_exclusions[tmp_index]))
        {
            if(!(strcmp(exclude, entry->mnt_type)))
            {
                skip =1;
                break;
            }
            tmp_index++;
        }

        if(skip || (strcmp(entry->mnt_type, "nfs") == 0))
            continue;

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        add_entry(core->log_exemnt_p, &space_left, entry);
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    }
    endmntent(tab);

    tab = setmntent("/etc/mtab", "r");
    if(!tab)
        return;
    /* loop through list of mounted file systems */
    while(mnt_data_count<DARSHAN_MAX_MNTS && (entry = getmntent(tab)) != NULL)
    {
        if(strcmp(entry->mnt_type, "nfs") != 0)
            continue;

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        add_entry(core->log_exemnt_p, &space_left, entry);
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    }
    endmntent(tab);

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    /* sort mount points in order of longest path to shortest path.  This is
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     * necessary so that if we try to match file paths to mount points later
     * we don't match on "/" every time.
     */
    qsort(mnt_data_array, mnt_data_count, sizeof(mnt_data_array[0]), mnt_data_cmp);
    return;
}

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static void darshan_fs_info_from_path(const char *path, struct darshan_fs_info *fs_info)
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{
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    int i;
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    fs_info->fs_type = -1;
    fs_info->block_size = -1;
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    for(i=0; i<mnt_data_count; i++)
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    {
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        if(!(strncmp(mnt_data_array[i].path, path, strlen(mnt_data_array[i].path))))
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        {
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            *fs_info = mnt_data_array[i].fs_info;
            return;
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        }
    }

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    return;
}

static int darshan_add_name_record_ref(struct darshan_core_runtime *core,
    darshan_record_id rec_id, const char *name, darshan_module_id mod_id)
{
    struct darshan_core_name_record_ref *ref;
    int record_size = sizeof(darshan_record_id) + strlen(name) + 1;

    if((record_size + core->name_mem_used) > DARSHAN_NAME_RECORD_BUF_SIZE)
        return(0);

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

    /* initialize the name record */
    ref->name_record = (struct darshan_name_record *)
        ((char *)core->log_name_p + core->name_mem_used);
    memset(ref->name_record, 0, record_size);
    ref->name_record->id = rec_id;
    strcpy(ref->name_record->name, name);
    DARSHAN_MOD_FLAG_SET(ref->mod_flags, mod_id);

    /* add the record to the hash table */
    HASH_ADD(hlink, core->name_hash, name_record->id,
        sizeof(darshan_record_id), ref);
    core->name_mem_used += record_size;
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
    core->log_hdr_p->name_map.len += record_size;
#endif

    return(1);
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}

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static void darshan_get_user_name(char *cuser)
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{
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    char* logname_string;
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    /* get the username for this job.  In order we will try each of the
     * following until one of them succeeds:
     *
     * - cuserid()
     * - getenv("LOGNAME")
     * - snprintf(..., geteuid());
     *
     * Note that we do not use getpwuid() because it generally will not
     * work in statically compiled binaries.
     */

#ifndef __DARSHAN_DISABLE_CUSERID
    cuserid(cuser);
#endif

    /* if cuserid() didn't work, then check the environment */
    if(strcmp(cuser, "") == 0)
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    {
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        logname_string = getenv("LOGNAME");
        if(logname_string)
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        {
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            strncpy(cuser, logname_string, (L_cuserid-1));
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        }
    }

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    /* if cuserid() and environment both fail, then fall back to uid */
    if(strcmp(cuser, "") == 0)
    {
        uid_t uid = geteuid();
        snprintf(cuser, L_cuserid, "%u", uid);
    }

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    return;
}

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/* construct the darshan log file name */
static void darshan_get_logfile_name(char* logfile_name, int jobid, struct tm* start_tm)
{
    char* user_logfile_name;
    char* logpath;
    char* logpath_override = NULL;
#ifdef __DARSHAN_LOG_ENV
    char env_check[256];
    char* env_tok;
#endif
    uint64_t hlevel;
    char hname[HOST_NAME_MAX];
    uint64_t logmod;
    char cuser[L_cuserid] = {0};
    int ret;

    /* first, check if user specifies a complete logpath to use */
    user_logfile_name = getenv("DARSHAN_LOGFILE");
    if(user_logfile_name)
    {
        if(strlen(user_logfile_name) >= (PATH_MAX-1))
        {
            fprintf(stderr, "darshan library warning: user log file name too long.\n");
            logfile_name[0] = '\0';
        }
        else
        {
            strcpy(logfile_name, user_logfile_name);
        }
    }
    else
    {
        /* otherwise, generate the log path automatically */

        /* Use DARSHAN_LOG_PATH_OVERRIDE for the value or __DARSHAN_LOG_PATH */
        logpath = getenv(DARSHAN_LOG_PATH_OVERRIDE);
        if(!logpath)
        {
#ifdef __DARSHAN_LOG_PATH
            logpath = __DARSHAN_LOG_PATH;
#endif
        }

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        darshan_get_user_name(cuser);
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        /* generate a random number to help differentiate the log */
        hlevel=DARSHAN_MPI_CALL(PMPI_Wtime)() * 1000000;
        (void)gethostname(hname, sizeof(hname));
        logmod = darshan_hash((void*)hname,strlen(hname),hlevel);

        /* see if darshan was configured using the --with-logpath-by-env
         * argument, which allows the user to specify an absolute path to
         * place logs via an env variable.
         */
#ifdef __DARSHAN_LOG_ENV
        /* just silently skip if the environment variable list is too big */
        if(strlen(__DARSHAN_LOG_ENV) < 256)
        {
            /* copy env variable list to a temporary buffer */
            strcpy(env_check, __DARSHAN_LOG_ENV);
            /* tokenize the comma-separated list */
            env_tok = strtok(env_check, ",");
            if(env_tok)
            {
                do
                {
                    /* check each env variable in order */
                    logpath_override = getenv(env_tok);
                    if(logpath_override)
                    {
                        /* stop as soon as we find a match */
                        break;
                    }
                }while((env_tok = strtok(NULL, ",")));
            }
        }
#endif

        if(logpath_override)
        {
            ret = snprintf(logfile_name, PATH_MAX,
                "%s/%s_%s_id%d_%d-%d-%d-%" PRIu64 ".darshan_partial",
                logpath_override,
                cuser, __progname, jobid,
                (start_tm->tm_mon+1),
                start_tm->tm_mday,
                (start_tm->tm_hour*60*60 + start_tm->tm_min*60 + start_tm->tm_sec),
                logmod);
            if(ret == (PATH_MAX-1))
            {
                /* file name was too big; squish it down */
                snprintf(logfile_name, PATH_MAX,
                    "%s/id%d.darshan_partial",
                    logpath_override, jobid);
            }
        }
        else if(logpath)
        {
            ret = snprintf(logfile_name, PATH_MAX,
                "%s/%d/%d/%d/%s_%s_id%d_%d-%d-%d-%" PRIu64 ".darshan_partial",
                logpath, (start_tm->tm_year+1900),
                (start_tm->tm_mon+1), start_tm->tm_mday,
                cuser, __progname, jobid,
                (start_tm->tm_mon+1),
                start_tm->tm_mday,
                (start_tm->tm_hour*60*60 + start_tm->tm_min*60 + start_tm->tm_sec),
                logmod);
            if(ret == (PATH_MAX-1))
            {
                /* file name was too big; squish it down */
                snprintf(logfile_name, PATH_MAX,
                    "%s/id%d.darshan_partial",
                    logpath, jobid);
            }
        }
        else
        {
            logfile_name[0] = '\0';
        }
    }

    return;
}

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static void darshan_get_shared_records(struct darshan_core_runtime *core,
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    darshan_record_id **shared_recs, int *shared_rec_cnt)
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{
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    int i, j;
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    int tmp_cnt = HASH_CNT(hlink, core->name_hash);
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    struct darshan_core_name_record_ref *tmp, *ref;
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    darshan_record_id *id_array;
    uint64_t *mod_flags;
    uint64_t *global_mod_flags;

    /* broadcast root's number of records to all other processes */
    DARSHAN_MPI_CALL(PMPI_Bcast)(&tmp_cnt, 1, MPI_INT, 0, MPI_COMM_WORLD);

    /* use root record count to allocate data structures */
    id_array = malloc(tmp_cnt * sizeof(darshan_record_id));
    mod_flags = malloc(tmp_cnt * sizeof(uint64_t));
    global_mod_flags = malloc(tmp_cnt * sizeof(uint64_t));
    *shared_recs = malloc(tmp_cnt * sizeof(darshan_record_id));
    assert(id_array && mod_flags && global_mod_flags && *shared_recs);

    memset(mod_flags, 0, tmp_cnt * sizeof(uint64_t));
    memset(global_mod_flags, 0, tmp_cnt * sizeof(uint64_t));
    memset(*shared_recs, 0, tmp_cnt * sizeof(darshan_record_id));
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    /* first, determine list of records root process has opened */
    if(my_rank == 0)
    {
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        i = 0;
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        HASH_ITER(hlink, core->name_hash, ref, tmp)
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        {
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            id_array[i++] = ref->name_record->id;
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        }
    }

    /* broadcast root's list of records to all other processes */
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    DARSHAN_MPI_CALL(PMPI_Bcast)(id_array, (tmp_cnt * sizeof(darshan_record_id)),
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        MPI_BYTE, 0, MPI_COMM_WORLD);

    /* everyone looks to see if they opened the same records as root */
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    for(i=0; i<tmp_cnt; i++)
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    {
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        HASH_FIND(hlink, core->name_hash, &id_array[i], sizeof(darshan_record_id), ref);
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        if(ref)
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        {
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            /* we opened that record too, save the mod_flags */
            mod_flags[i] = ref->mod_flags;
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        }
    }

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    /* now allreduce so everyone agrees which records are shared and
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     * which modules accessed them collectively
     */
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    DARSHAN_MPI_CALL(PMPI_Allreduce)(mod_flags, global_mod_flags, tmp_cnt,
        MPI_UINT64_T, MPI_BAND, MPI_COMM_WORLD);
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    j = 0;
    for(i=0; i<tmp_cnt; i++)
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    {
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        if(global_mod_flags[i] != 0)
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        {
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            (*shared_recs)[j++] = id_array[i];
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            /* set global_mod_flags so we know which modules collectively
             * accessed this module. we need this info to support shared
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             * record reductions
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             */
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            HASH_FIND(hlink, core->name_hash, &id_array[i], sizeof(darshan_record_id), ref);
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            assert(ref);
            ref->global_mod_flags = global_mod_flags[i];
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        }
    }
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    *shared_rec_cnt = j;
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    free(id_array);
    free(mod_flags);
    free(global_mod_flags);
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    return;
}

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static int darshan_log_open_all(char *logfile_name, MPI_File *log_fh)
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{
    char *hints;
    char *tok_str;
    char *orig_tok_str;
    char *key;
    char *value;
    char *saveptr = NULL;
    int ret;
    MPI_Info info;

    /* check environment variable to see if the default MPI file hints have
     * been overridden
     */
    MPI_Info_create(&info);

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    hints = getenv(DARSHAN_LOG_HINTS_OVERRIDE);
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    if(!hints)
    {
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        hints = __DARSHAN_LOG_HINTS;
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    }

    if(hints && strlen(hints) > 0)
    {
        tok_str = strdup(hints);
        if(tok_str)
        {
            orig_tok_str = tok_str;
            do
            {
                /* split string on semicolon */
                key = strtok_r(tok_str, ";", &saveptr);
                if(key)
                {
                    tok_str = NULL;
                    /* look for = sign splitting key/value pairs */
                    value = index(key, '=');
                    if(value)
                    {
                        /* break key and value into separate null terminated strings */
                        value[0] = '\0';
                        value++;
                        if(strlen(key) > 0)
                            MPI_Info_set(info, key, value);
                    }
                }
            }while(key != NULL);
            free(orig_tok_str);
        }
    }

    /* open the darshan log file for writing */
    ret = DARSHAN_MPI_CALL(PMPI_File_open)(MPI_COMM_WORLD, logfile_name,
        MPI_MODE_CREATE | MPI_MODE_WRONLY | MPI_MODE_EXCL, info, log_fh);
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    if(ret != MPI_SUCCESS)
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        return(-1);

    MPI_Info_free(&info);
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    return(0);
}

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static int darshan_deflate_buffer(void **pointers, int *lengths, int count,
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    char *comp_buf, int *comp_buf_length)
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{
    int ret = 0;
    int i;
    int total_target = 0;
    z_stream tmp_stream;

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    /* just return if there is no data */
    for(i = 0; i < count; i++)
    {
        total_target += lengths[i];
    }
    if(total_target)
    {
        total_target = 0;
    }
    else
    {
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        *comp_buf_length = 0;
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        return(0);
    }