darshan-core.c 65.1 KB
Newer Older
1
/*
Shane Snyder's avatar
Shane Snyder committed
2 3 4
 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
5 6
 */

7
#define _XOPEN_SOURCE 500
8
#define _GNU_SOURCE
9

10 11 12 13 14 15
#include "darshan-runtime-config.h"

#include <stdio.h>
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
16 17 18 19 20
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <pthread.h>
21
#include <fcntl.h>
22 23
#include <dirent.h>
#include <sys/ioctl.h>
24 25
#include <sys/types.h>
#include <sys/stat.h>
26
#include <sys/mman.h>
27
#include <sys/vfs.h>
28
#include <zlib.h>
29
#include <mpi.h>
30
#include <assert.h>
31

32
#include "uthash.h"
Shane Snyder's avatar
Shane Snyder committed
33
#include "darshan.h"
34
#include "darshan-core.h"
Shane Snyder's avatar
Shane Snyder committed
35
#include "darshan-dynamic.h"
36

37
#ifdef DARSHAN_LUSTRE
38
#include <lustre/lustre_user.h>
39
#endif
40

41
extern char* __progname;
42
extern char* __progname_full;
43

44
/* internal variable delcarations */
45
static struct darshan_core_runtime *darshan_core = NULL;
46
static pthread_mutex_t darshan_core_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
47
static int my_rank = -1;
48
static int nprocs = -1;
49
static int darshan_mem_alignment = 1;
50
static long darshan_mod_mem_quota = DARSHAN_MOD_MEM_MAX;
51

52
/* paths prefixed with the following directories are not tracked by darshan */
53
char* darshan_path_exclusions[] = {
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
    "/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
73 74
};

75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
#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
};

90 91 92 93 94 95 96
#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

Shane Snyder's avatar
Shane Snyder committed
97 98 99
#define DARSHAN_CORE_LOCK() pthread_mutex_lock(&darshan_core_mutex)
#define DARSHAN_CORE_UNLOCK() pthread_mutex_unlock(&darshan_core_mutex)

100 101 102 103 104 105 106 107
/* 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];
108
    struct darshan_fs_info fs_info;
109 110 111 112
};
static struct mnt_data mnt_data_array[DARSHAN_MAX_MNTS];
static int mnt_data_count = 0;

113
/* prototypes for internal helper functions */
114
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
115 116
static void *darshan_init_mmap_log(
    struct darshan_core_runtime* core, int jobid);
117
#endif
118
static void darshan_log_record_hints_and_ver(
119
    struct darshan_core_runtime* core);
120 121
static void darshan_get_exe_and_mounts(
    struct darshan_core_runtime *core, int argc, char **argv);
122 123
static void darshan_fs_info_from_path(
    const char *path, struct darshan_fs_info *fs_info);
124
static int darshan_add_name_record_ref(
125
    struct darshan_core_runtime *core, darshan_record_id rec_id,
126
    const char *name, darshan_module_id mod_id);
127 128
static void darshan_get_user_name(
    char *user);
129 130
static void darshan_get_logfile_name(
    char* logfile_name, int jobid, struct tm* start_tm);
131
static void darshan_get_shared_records(
132 133
    struct darshan_core_runtime *core, darshan_record_id **shared_recs,
    int *shared_rec_cnt);
134
static int darshan_log_open_all(
135
    char *logfile_name, MPI_File *log_fh);
136
static int darshan_deflate_buffer(
Shane Snyder's avatar
Shane Snyder committed
137 138
    void **pointers, int *lengths, int count, char *comp_buf,
    int *comp_buf_length);
139
static int darshan_log_write_name_record_hash(
140
    MPI_File log_fh, struct darshan_core_runtime *core,
141 142 143
    uint64_t *inout_off);
static int darshan_log_append_all(
    MPI_File log_fh, struct darshan_core_runtime *core, void *buf,
Shane Snyder's avatar
Shane Snyder committed
144
    int count, uint64_t *inout_off);
Shane Snyder's avatar
Shane Snyder committed
145 146
static void darshan_core_cleanup(
    struct darshan_core_runtime* core);
147

148 149
/* *********************************** */

Shane Snyder's avatar
Shane Snyder committed
150
void darshan_core_initialize(int argc, char **argv)
151
{
152
    struct darshan_core_runtime *init_core = NULL;
153 154
    int internal_timing_flag = 0;
    double init_start, init_time, init_max;
155
    char *envstr;
156 157
    char *jobid_str;
    int jobid;
158 159
    int ret;
    int tmpval;
160
    int i;
161 162

    DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
163
    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &my_rank);
164 165 166 167

    if(getenv("DARSHAN_INTERNAL_TIMING"))
        internal_timing_flag = 1;

168
    if(internal_timing_flag)
169 170 171
        init_start = DARSHAN_MPI_CALL(PMPI_Wtime)();

    /* setup darshan runtime if darshan is enabled and hasn't been initialized already */
172
    if(!getenv("DARSHAN_DISABLE") && !darshan_core)
173
    {
174
        #if (__DARSHAN_MEM_ALIGNMENT < 1)
175 176
            #error Darshan must be configured with a positive value for --with-mem-align
        #endif
177
        envstr = getenv(DARSHAN_MEM_ALIGNMENT_OVERRIDE);
178 179 180 181 182 183 184 185 186 187 188
        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
        {
189
            darshan_mem_alignment = __DARSHAN_MEM_ALIGNMENT;
190 191 192
        }

        /* avoid floating point errors on faulty input */
193
        if(darshan_mem_alignment < 1)
194 195 196
        {
            darshan_mem_alignment = 1;
        }
197

198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
        /* 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();
        }

218 219 220 221 222 223 224 225 226 227 228 229
        /* set the memory quota for darshan modules' records */
        envstr = getenv(DARSHAN_MOD_MEM_OVERRIDE);
        if(envstr)
        {
            ret = sscanf(envstr, "%d", &tmpval);
            /* silently ignore if the env variable is set poorly */
            if(ret == 1 && tmpval > 0)
            {
                darshan_mod_mem_quota = tmpval * 1024 * 1024; /* convert from MiB */
            }
        }

230 231 232
        /* allocate structure to track darshan core runtime information */
        init_core = malloc(sizeof(*init_core));
        if(init_core)
233
        {
234 235 236
            memset(init_core, 0, sizeof(*init_core));
            init_core->wtime_offset = DARSHAN_MPI_CALL(PMPI_Wtime)();

237 238
        /* TODO: do we alloc new memory as we go or just do everything up front? */

239 240 241 242 243
#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);
244
            init_core->log_name_p = malloc(DARSHAN_NAME_RECORD_BUF_SIZE);
245
            init_core->log_mod_p = malloc(darshan_mod_mem_quota);
246 247

            if(!(init_core->log_hdr_p) || !(init_core->log_job_p) ||
248
               !(init_core->log_exemnt_p) || !(init_core->log_name_p) ||
249 250 251 252 253 254 255 256 257
               !(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);
258
            memset(init_core->log_name_p, 0, DARSHAN_NAME_RECORD_BUF_SIZE);
259
            memset(init_core->log_mod_p, 0, darshan_mod_mem_quota);
260 261 262 263
#else
            /* if mmap logs are enabled, we need to initialize the mmap region
             * before setting the corresponding log file region pointers
             */
264 265
            void *mmap_p = darshan_init_mmap_log(init_core, jobid);
            if(!mmap_p)
266
            {
267 268
                free(init_core);
                return;
269 270
            }

271
            /* set the memory pointers for each log file region */
272
            init_core->log_hdr_p = (struct darshan_header *)mmap_p;
273
            init_core->log_job_p = (struct darshan_job *)
274
                ((char *)init_core->log_hdr_p + sizeof(struct darshan_header));
275
            init_core->log_exemnt_p = (char *)
276
                ((char *)init_core->log_job_p + sizeof(struct darshan_job));
277
            init_core->log_name_p = (void *)
278 279
                ((char *)init_core->log_exemnt_p + DARSHAN_EXE_LEN + 1);
            init_core->log_mod_p = (void *)
280
                ((char *)init_core->log_name_p + DARSHAN_NAME_RECORD_BUF_SIZE);
281

282
            /* set header fields needed for the mmap log mechanism */
283
            init_core->log_hdr_p->comp_type = DARSHAN_NO_COMP;
284
            init_core->log_hdr_p->name_map.off =
285
                ((char *)init_core->log_name_p - (char *)init_core->log_hdr_p);
286 287 288 289 290
#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;
291

292 293 294 295 296
            /* 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;
297 298 299 300 301 302

            /* 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);

303
            /* collect information about command line and mounted file systems */
304
            darshan_get_exe_and_mounts(init_core, argc, argv);
305

306 307 308 309
            /* if darshan was successfully initialized, set the global pointer
             * and bootstrap any modules with static initialization routines
             */
            DARSHAN_CORE_LOCK();
310
            darshan_core = init_core;
311 312 313 314 315 316 317 318
            DARSHAN_CORE_UNLOCK();

            i = 0;
            while(mod_static_init_fns[i])
            {
                (*mod_static_init_fns[i])();
                i++;
            }
319
        }
320 321
    }

322 323 324 325 326
    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);
327
        if(my_rank == 0)
328
        {
329 330
            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
            fprintf(stderr, "darshan:init\t%d\t%f\n", nprocs, init_max);
331 332 333 334 335 336
        }
    }

    return;
}

Shane Snyder's avatar
Shane Snyder committed
337
void darshan_core_shutdown()
338
{
339
    struct darshan_core_runtime *final_core;
340
    int internal_timing_flag = 0;
341 342
    struct tm *start_tm;
    time_t start_time_tmp;
343
    int64_t first_start_time;
344
    int64_t last_end_time;
345
    double start_log_time;
346
    double tm_end;
347 348 349
    double open1 = 0, open2 = 0;
    double job1 = 0, job2 = 0;
    double rec1 = 0, rec2 = 0;
350 351
    double mod1[DARSHAN_MAX_MODS] = {0};
    double mod2[DARSHAN_MAX_MODS] = {0};
352
    double header1 = 0, header2 = 0;
353 354 355 356 357 358 359 360 361 362 363 364
    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;
365 366 367 368

    if(getenv("DARSHAN_INTERNAL_TIMING"))
        internal_timing_flag = 1;

369 370
    /* synchronize before getting start time */
    DARSHAN_MPI_CALL(PMPI_Barrier)(MPI_COMM_WORLD);
Shane Snyder's avatar
Shane Snyder committed
371
    start_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
372

Shane Snyder's avatar
Shane Snyder committed
373
    /* disable darhan-core while we shutdown */
374
    DARSHAN_CORE_LOCK();
375
    if(!darshan_core)
376
    {
377
        DARSHAN_CORE_UNLOCK();
378 379
        return;
    }
380 381
    final_core = darshan_core;
    darshan_core = NULL;
382 383
    DARSHAN_CORE_UNLOCK();

384
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
385 386 387 388 389
    /* 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.
390
     */
391
    unlink(final_core->mmap_log_name);
392
#endif
Shane Snyder's avatar
Shane Snyder committed
393

394 395 396 397 398 399 400 401
    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)
Shane Snyder's avatar
Shane Snyder committed
402
    {
403 404
        final_core->log_job_p->start_time = first_start_time;
        final_core->log_job_p->end_time = last_end_time;
Shane Snyder's avatar
Shane Snyder committed
405
    }
406

407 408 409 410 411 412
    final_core->comp_buf = malloc(DARSHAN_COMP_BUF_SIZE);
    if(!(final_core->comp_buf))
    {
        darshan_core_cleanup(final_core);
        return;
    }
413

414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
    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 */
        free(logfile_name);
        darshan_core_cleanup(final_core);
        return;
    }
442

443 444 445 446 447
    /* 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++)
448
    {
449 450
        if(final_core->mod_array[i])
            local_mod_use[i] = 1;
451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
    }

    /* 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)
        {
            fprintf(stderr, "darshan library warning: unable to open log file %s\n",
                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)
    {
487
        void *pointers[2] = {final_core->log_job_p, final_core->log_exemnt_p};
488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530
        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 */
531
    final_core->log_hdr_p->name_map.off = gz_fp;
532
    ret = darshan_log_write_name_record_hash(log_fh, final_core, &gz_fp);
533
    final_core->log_hdr_p->name_map.len = gz_fp - final_core->log_hdr_p->name_map.off;
534

535
    /* error out if unable to write the name record hash */
536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
    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
561
     *      - add module map info (file offset/length) to log header
562 563 564 565 566
     *      - shutdown the module
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
    {
        struct darshan_core_module* this_mod = final_core->mod_array[i];
567
        struct darshan_core_name_record_ref *ref = NULL;
568 569 570 571 572 573 574 575 576
        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)
            {
577 578
                final_core->log_hdr_p->mod_map[i].off = 0;
                final_core->log_hdr_p->mod_map[i].len = 0;
579 580 581 582 583 584 585
            }
            continue;
        }

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

586
        /* set the shared record list for this module */
587 588
        for(j = 0; j < shared_rec_cnt; j++)
        {
589
            HASH_FIND(hlink, final_core->name_hash, &shared_recs[j],
590 591 592 593 594 595 596 597 598 599 600
                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
601
         * modules, if there are records shared globally.
602 603 604
         */
        if(this_mod)
        {
605 606
            mod_buf = final_core->mod_array[i]->rec_buf_start;
            mod_buf_sz = final_core->mod_array[i]->rec_buf_p - mod_buf;
607
            this_mod->mod_shutdown_func(MPI_COMM_WORLD, mod_shared_recs,
608 609 610 611
                mod_shared_rec_cnt, &mod_buf, &mod_buf_sz);
        }

        /* append this module's data to the darshan log */
612
        final_core->log_hdr_p->mod_map[i].off = gz_fp;
613
        ret = darshan_log_append_all(log_fh, final_core, mod_buf, mod_buf_sz, &gz_fp);
614 615
        final_core->log_hdr_p->mod_map[i].len =
            gz_fp - final_core->log_hdr_p->mod_map[i].off;
616

617 618 619 620 621 622
        /* 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);

623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
        /* 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)();
646
    /* write out log header, after running 2 reductions on header variables:
647
     *  1) reduce 'partial_flag' variable to determine which modules ran out
648
     *     of memory for storing data
649 650 651 652 653 654
     *  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 */
655 656 657 658 659 660 661 662
        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);
663

664
        all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, 0, final_core->log_hdr_p,
665 666 667 668 669 670 671 672
            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);
        }
    }
673 674 675 676 677 678 679 680 681
    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);
    }
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701

    /* 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)
    {
702
        mode_t chmod_mode = S_IRUSR;
703
#ifdef __DARSHAN_GROUP_READABLE_LOGS
704
        chmod_mode |= S_IRGRP;
705
#endif
706 707 708 709

        if(getenv("DARSHAN_LOGFILE"))
        {
            chmod(logfile_name, chmod_mode);
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
        }
        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 */
727
                chmod(new_logfile_name, chmod_mode);
728 729 730 731 732 733
                free(new_logfile_name);
            }
        }
    }

    free(logfile_name);
734 735
    free(shared_recs);
    free(mod_shared_recs);
736
    darshan_core_cleanup(final_core);
737

738
    if(internal_timing_flag)
739
    {
740 741 742 743 744
        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];
745 746 747 748
        double all_tm, all_slowest;

        tm_end = DARSHAN_MPI_CALL(PMPI_Wtime)();

749 750 751 752
        open_tm = open2 - open1;
        header_tm = header2 - header1;
        job_tm = job2 - job1;
        rec_tm = rec2 - rec1;
753
        all_tm = tm_end - start_log_time;
754 755 756 757
        for(i = 0;i < DARSHAN_MAX_MODS; i++)
        {
            mod_tm[i] = mod2[i] - mod1[i];
        }
758

759 760 761 762 763 764 765 766
        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);
767 768
        DARSHAN_MPI_CALL(PMPI_Reduce)(&all_tm, &all_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
769 770
        DARSHAN_MPI_CALL(PMPI_Reduce)(mod_tm, mod_slowest, DARSHAN_MAX_MODS,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
771 772 773

        if(my_rank == 0)
        {
774
            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
775 776 777 778 779 780 781 782 783 784
            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]);
            }
785
            fprintf(stderr, "darshan:core_shutdown\t%d\t%f\n", nprocs, all_slowest);
786
        }
787
    }
788

789 790
    return;
}
791

Shane Snyder's avatar
Shane Snyder committed
792
/* *********************************** */
793

794
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
795 796 797 798 799 800 801
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};
802 803 804
    uint64_t hlevel;
    char hname[HOST_NAME_MAX];
    uint64_t logmod;
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
    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);

825 826 827 828 829 830 831 832 833 834 835 836 837
    /* 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);

838 839 840 841
    /* construct a unique temporary log file name for this process
     * to write mmap log data to
     */
    snprintf(core->mmap_log_name, PATH_MAX,
842 843
        "/%s/%s_%s_id%d_mmap-log-%" PRIu64 "-%d.darshan",
        mmap_log_path, cuser, __progname, jobid, logmod, my_rank);
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883

    /* 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);
}
884
#endif
885

886
/* record any hints used to write the darshan log in the job data */
887
static void darshan_log_record_hints_and_ver(struct darshan_core_runtime* core)
888 889
{
    char* hints;
890
    char* job_hints;
891 892 893 894 895 896
    int meta_remain = 0;
    char* m;

    /* check environment variable to see if the default MPI file hints have
     * been overridden
     */
897
    hints = getenv(DARSHAN_LOG_HINTS_OVERRIDE);
898 899
    if(!hints)
    {
900
        hints = __DARSHAN_LOG_HINTS;
901 902 903 904 905
    }

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

906 907
    job_hints = strdup(hints);
    if(!job_hints)
908 909 910
        return;

    meta_remain = DARSHAN_JOB_METADATA_LEN -
911
        strlen(core->log_job_p->metadata) - 1;
912 913
    if(meta_remain >= (strlen(PACKAGE_VERSION) + 9))
    {
914
        sprintf(core->log_job_p->metadata, "lib_ver=%s\n", PACKAGE_VERSION);
915 916
        meta_remain -= (strlen(PACKAGE_VERSION) + 9);
    }
917
    if(meta_remain >= (3 + strlen(job_hints)))
918
    {
919
        m = core->log_job_p->metadata + strlen(core->log_job_p->metadata);
920
        /* We have room to store the hints in the metadata portion of
921
         * the job structure.  We just prepend an h= to the hints list.  The
922 923 924
         * metadata parser will ignore = characters that appear in the value
         * portion of the metadata key/value pair.
         */
925
        sprintf(m, "h=%s\n", job_hints);
926
    }
927
    free(job_hints);
928 929 930 931

    return;
}

932 933 934 935 936 937 938 939 940 941 942 943 944 945
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 */
946
static void add_entry(char* buf, int* space_left, struct mntent* entry)
947
{
948
    int i;
949 950 951 952
    int ret;
    char tmp_mnt[256];
    struct statfs statfsbuf;

953 954 955 956 957 958 959 960 961 962
    /* 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;
    }

963 964 965 966 967 968 969 970 971 972 973 974
    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);
975
    mnt_data_array[mnt_data_count].fs_info.fs_type = statfsbuf.f_type;
976
    if(ret == 0 && statfsbuf.f_type != LL_SUPER_MAGIC)
977
        mnt_data_array[mnt_data_count].fs_info.block_size = statfsbuf.f_bsize;
978
    else if(ret == 0 && statfsbuf.f_type == LL_SUPER_MAGIC)
979
        mnt_data_array[mnt_data_count].fs_info.block_size = 1024*1024;
980
    else
981
        mnt_data_array[mnt_data_count].fs_info.block_size = 4096;
982

983
#ifdef DARSHAN_LUSTRE
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
    /* 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 );

1003
            if ( !(ret_ost < 0 || ret_mdt < 0) )
1004 1005 1006 1007 1008 1009 1010
            {
                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 );
        }
    }
1011
#endif
1012

1013
    /* store mount information with the job-level metadata in darshan log */
1014
    ret = snprintf(tmp_mnt, 256, "\n%s\t%s",
1015 1016 1017
        entry->mnt_type, entry->mnt_dir);
    if(ret < 256 && strlen(tmp_mnt) <= (*space_left))
    {
1018
        strcat(buf, tmp_mnt);
1019 1020 1021 1022 1023 1024 1025
        (*space_left) -= strlen(tmp_mnt);
    }

    mnt_data_count++;
    return;
}

1026
/* darshan_get_exe_and_mounts()
1027 1028
 *
 * collects command line and list of mounted file systems into a string that
1029
 * will be stored with the job-level metadata
1030
 */
1031
static void darshan_get_exe_and_mounts(struct darshan_core_runtime *core,
1032
    int argc, char **argv)
1033 1034 1035 1036
{
    FILE* tab;
    struct mntent *entry;
    char* exclude;
1037 1038 1039
    char* truncate_string = "<TRUNCATED>";
    int truncate_offset;
    int space_left = DARSHAN_EXE_LEN;
1040 1041 1042
    FILE *fh;
    int i, ii;
    char cmdl[DARSHAN_EXE_LEN];
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
    int tmp_index = 0;
    int skip = 0;

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

1064 1065 1066
    /* record exe and arguments */
    for(i=0; i<argc; i++)
    {
1067 1068
        strncat(core->log_exemnt_p, argv[i], space_left);
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
1069 1070
        if(i < (argc-1))
        {
1071 1072
            strncat(core->log_exemnt_p, " ", space_left);
            space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
1073 1074 1075 1076 1077 1078 1079 1080
        }
    }

    /* if we don't see any arguments, then use glibc symbol to get
     * program name at least (this happens in fortran)
     */
    if(argc == 0)
    {
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
        /* 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;
                }
            }
1098
            fclose(fh);
1099
        } else {
1100
           sprintf(cmdl, "%s <unknown args>", __progname_full);
1101 1102
        }
        strncat(core->log_exemnt_p, cmdl, space_left);
1103
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
1104 1105 1106 1107 1108 1109
    }

    if(space_left == 0)
    {
        /* we ran out of room; mark that string was truncated */
        truncate_offset = DARSHAN_EXE_LEN - strlen(truncate_string);
1110
        sprintf(&(core->log_exemnt_p[truncate_offset]), "%s",
1111 1112 1113
            truncate_string);
    }

1114 1115 1116 1117
    /* 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
     */
1118
    mnt_data_count = 0;
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141

    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;

1142
        add_entry(core->log_exemnt_p, &space_left, entry);
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
    }
    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;

1155
        add_entry(core->log_exemnt_p, &space_left, entry);
1156 1157 1158
    }
    endmntent(tab);

1159
    /* sort mount points in order of longest path to shortest path.  This is
1160 1161 1162 1163 1164 1165 1166
     * 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;
}

Shane Snyder's avatar
Shane Snyder committed
1167
static void darshan_fs_info_from_path(const char *path, struct darshan_fs_info *fs_info)
1168
{
1169
    int i;
Shane Snyder's avatar
Shane Snyder committed
1170 1171
    fs_info->fs_type = -1;
    fs_info->block_size = -1;
1172

1173
    for(i=0; i<mnt_data_count; i++)
1174
    {
1175
        if(!(strncmp(mnt_data_array[i].path, path, strlen(mnt_data_array[i].path))))
1176
        {
Shane Snyder's avatar
Shane Snyder committed
1177 1178
            *fs_info = mnt_data_array[i].fs_info;
            return;
1179 1180 1181
        }
    }

Shane Snyder's avatar
Shane Snyder committed
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
    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);
1216 1217
}

1218
static void darshan_get_user_name(char *cuser)
1219
{
1220
    char* logname_string;
1221

1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
    /* 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)
1239
    {
1240 1241
        logname_string = getenv("LOGNAME");
        if(logname_string)
1242
        {
1243
            strncpy(cuser, logname_string, (L_cuserid-1));
1244 1245 1246
        }
    }

1247 1248 1249 1250 1251 1252 1253
    /* 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);
    }

1254 1255 1256
    return;
}

1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
/* 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
        }

1300
        darshan_get_user_name(cuser);
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380

        /* 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;
}

1381
static void darshan_get_shared_records(struct darshan_core_runtime *core,
1382
    darshan_record_id **shared_recs, int *shared_rec_cnt)
1383
{
1384
    int i, j;
1385
    int tmp_cnt = HASH_CNT(hlink, core->name_hash);
1386
    struct darshan_core_name_record_ref *tmp, *ref;
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
    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));
1404 1405 1406 1407

    /* first, determine list of records root process has opened */
    if(my_rank == 0)
    {
1408
        i = 0;