darshan-core.c 49.9 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 22 23
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/vfs.h>
24
#include <zlib.h>
25
#include <mpi.h>
26
#include <assert.h>
27

28
#include "uthash.h"
Shane Snyder's avatar
Shane Snyder committed
29
#include "darshan.h"
30
#include "darshan-core.h"
Shane Snyder's avatar
Shane Snyder committed
31
#include "darshan-dynamic.h"
32

33
extern char* __progname;
34
extern char* __progname_full;
35

36
/* internal variable delcarations */
37
static struct darshan_core_runtime *darshan_core = NULL;
38
static pthread_mutex_t darshan_core_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
39
static int my_rank = -1;
40
static int nprocs = -1;
41
static int darshan_mem_alignment = 1;
42

43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
/* paths prefixed with the following directories are not traced by darshan */
char* darshan_path_exclusions[] = {
"/etc/",
"/dev/",
"/usr/",
"/bin/",
"/boot/",
"/lib/",
"/opt/",
"/sbin/",
"/sys/",
"/proc/",
NULL
};

Shane Snyder's avatar
Shane Snyder committed
58 59 60
#define DARSHAN_CORE_LOCK() pthread_mutex_lock(&darshan_core_mutex)
#define DARSHAN_CORE_UNLOCK() pthread_mutex_unlock(&darshan_core_mutex)

61 62 63 64 65 66
/* FS mount information */
#define DARSHAN_MAX_MNTS 64
#define DARSHAN_MAX_MNT_PATH 256
#define DARSHAN_MAX_MNT_TYPE 32
struct mnt_data
{
67
    int block_size;
68 69 70 71 72 73
    char path[DARSHAN_MAX_MNT_PATH];
    char type[DARSHAN_MAX_MNT_TYPE];
};
static struct mnt_data mnt_data_array[DARSHAN_MAX_MNTS];
static int mnt_data_count = 0;

74 75 76 77
/* prototypes for internal helper functions */
static void darshan_get_logfile_name(
    char* logfile_name, int jobid, struct tm* start_tm);
static void darshan_log_record_hints_and_ver(
78 79 80 81 82 83
    struct darshan_core_runtime* core);
static void darshan_get_exe_and_mounts_root(
    struct darshan_core_runtime *core, char* trailing_data,
    int space_left);
static char* darshan_get_exe_and_mounts(
    struct darshan_core_runtime *core);
84 85
static void darshan_block_size_from_path(
    const char *path, int *block_size);
86
static void darshan_get_shared_records(
87
    struct darshan_core_runtime *core, darshan_record_id *shared_recs);
88
static int darshan_log_open_all(
89
    char *logfile_name, MPI_File *log_fh);
90 91 92
static int darshan_deflate_buffer(
    void **pointers, int *lengths, int count, int nocomp_flag,
    char *comp_buf, int *comp_length);
93
static int darshan_log_write_record_hash(
94
    MPI_File log_fh, struct darshan_core_runtime *core,
95 96 97 98
    uint64_t *inout_off);
static int darshan_log_append_all(
    MPI_File log_fh, struct darshan_core_runtime *core, void *buf,
    int count, uint64_t *inout_off, uint64_t *agg_uncomp_sz);
Shane Snyder's avatar
Shane Snyder committed
99 100
static void darshan_core_cleanup(
    struct darshan_core_runtime* core);
101

102 103
/* *********************************** */

Shane Snyder's avatar
Shane Snyder committed
104
void darshan_core_initialize(int argc, char **argv)
105 106 107 108
{
    int i;
    int internal_timing_flag = 0;
    double init_start, init_time, init_max;
109
    char *envstr;
110 111 112
    char* truncate_string = "<TRUNCATED>";
    int truncate_offset;
    int chars_left = 0;
113 114
    int ret;
    int tmpval;
115 116

    DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
117
    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &my_rank);
118 119 120 121

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

122
    if(internal_timing_flag)
123 124 125
        init_start = DARSHAN_MPI_CALL(PMPI_Wtime)();

    /* setup darshan runtime if darshan is enabled and hasn't been initialized already */
126
    if(!getenv("DARSHAN_DISABLE") && !darshan_core)
127
    {
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
        #if (__CP_MEM_ALIGNMENT < 1)
            #error Darshan must be configured with a positive value for --with-mem-align
        #endif
        envstr = getenv("DARSHAN_MEMALIGN");
        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
        {
            darshan_mem_alignment = __CP_MEM_ALIGNMENT;
        }

        /* avoid floating point errors on faulty input */
        if (darshan_mem_alignment < 1)
        {
            darshan_mem_alignment = 1;
        }
151 152 153 154

        /* allocate structure to track darshan_core_runtime information */
        darshan_core = malloc(sizeof(*darshan_core));
        if(darshan_core)
155
        {
156
            memset(darshan_core, 0, sizeof(*darshan_core));
157

158 159 160 161
            darshan_core->log_job.uid = getuid();
            darshan_core->log_job.start_time = time(NULL);
            darshan_core->log_job.nprocs = nprocs;
            darshan_core->wtime_offset = DARSHAN_MPI_CALL(PMPI_Wtime)();
162 163

            /* record exe and arguments */
164
            for(i=0; i<argc; i++)
165
            {
166
                chars_left = DARSHAN_EXE_LEN-strlen(darshan_core->exe);
167 168
                strncat(darshan_core->exe, argv[i], chars_left);
                if(i < (argc-1))
169
                {
170
                    chars_left = DARSHAN_EXE_LEN-strlen(darshan_core->exe);
171
                    strncat(darshan_core->exe, " ", chars_left);
172 173 174 175 176 177 178 179
                }
            }

            /* if we don't see any arguments, then use glibc symbol to get
             * program name at least (this happens in fortran)
             */
            if(argc == 0)
            {
180
                chars_left = DARSHAN_EXE_LEN-strlen(darshan_core->exe);
181
                strncat(darshan_core->exe, __progname_full, chars_left);
182
                chars_left = DARSHAN_EXE_LEN-strlen(darshan_core->exe);
183
                strncat(darshan_core->exe, " <unknown args>", chars_left);
184 185 186 187 188
            }

            if(chars_left == 0)
            {
                /* we ran out of room; mark that string was truncated */
189
                truncate_offset = DARSHAN_EXE_LEN - strlen(truncate_string);
190
                sprintf(&darshan_core->exe[truncate_offset], "%s",
191 192
                    truncate_string);
            }
193 194 195

            /* collect information about command line and mounted file systems */
            darshan_core->trailing_data = darshan_get_exe_and_mounts(darshan_core);
196 197 198 199 200 201 202 203
        }
    }

    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);
204
        if(my_rank == 0)
205 206 207 208 209 210 211 212 213
        {
            printf("#darshan:<op>\t<nprocs>\t<time>\n");
            printf("darshan:init\t%d\t%f\n", nprocs, init_max);
        }
    }

    return;
}

Shane Snyder's avatar
Shane Snyder committed
214
void darshan_core_shutdown()
215
{
216
    int i;
217
    char *logfile_name;
218
    struct darshan_core_runtime *final_core;
219
    int internal_timing_flag = 0;
220 221
    char *envjobid;
    char *jobid_str;
222
    int jobid;
223
    struct tm *start_tm;
224
    time_t start_time_tmp;
225 226
    int ret = 0;
    int all_ret = 0;
227 228
    int64_t first_start_time;
    int64_t last_end_time;
229 230
    int local_mod_use[DARSHAN_MAX_MODS] = {0};
    int global_mod_use_count[DARSHAN_MAX_MODS] = {0};
231
    darshan_record_id shared_recs[DARSHAN_CORE_MAX_RECORDS] = {0};
232
    double start_log_time;
233 234 235 236 237 238 239
    double open1, open2;
    double job1, job2;
    double rec1, rec2;
    double mod1[DARSHAN_MAX_MODS] = {0};
    double mod2[DARSHAN_MAX_MODS] = {0};
    double header1, header2;
    double tm_end;
240 241
    uint64_t gz_fp = 0;
    uint64_t tmp_off = 0;
242 243
    MPI_File log_fh;
    MPI_Status status;
244 245 246 247

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

248 249
    start_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();

Shane Snyder's avatar
Shane Snyder committed
250
    /* disable darhan-core while we shutdown */
251
    DARSHAN_CORE_LOCK();
252
    if(!darshan_core)
253
    {
254
        DARSHAN_CORE_UNLOCK();
255 256
        return;
    }
257 258
    final_core = darshan_core;
    darshan_core = NULL;
Shane Snyder's avatar
Shane Snyder committed
259

260
    /* we also need to set which modules were registered on this process and
261 262
     * call into those modules and give them a chance to perform any necessary
     * pre-shutdown steps.
Shane Snyder's avatar
Shane Snyder committed
263 264 265 266 267 268
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
    {
        if(final_core->mod_array[i])
        {
            local_mod_use[i] = 1;
269
            final_core->mod_array[i]->mod_funcs.begin_shutdown();
Shane Snyder's avatar
Shane Snyder committed
270 271
        }
    }
272
    DARSHAN_CORE_UNLOCK();
273 274 275 276

    logfile_name = malloc(PATH_MAX);
    if(!logfile_name)
    {
277
        darshan_core_cleanup(final_core);
278 279 280
        return;
    }

281
    /* set darshan job id/metadata and constuct log file name on rank 0 */
282
    if(my_rank == 0)
283 284 285
    {
        /* Use CP_JOBID_OVERRIDE for the env var or CP_JOBID */
        envjobid = getenv(CP_JOBID_OVERRIDE);
286
        if(!envjobid)
287 288 289 290
        {
            envjobid = CP_JOBID;
        }

291
        /* find a job id */
292 293 294 295 296 297 298 299 300 301 302 303
        jobid_str = getenv(envjobid);
        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();
        }

304
        final_core->log_job.jobid = (int64_t)jobid;
305

306
        /* if we are using any hints to write the log file, then record those
307
         * hints with the darshan job information
308
         */
309
        darshan_log_record_hints_and_ver(final_core);
310

311
        /* use human readable start time format in log filename */
312
        start_time_tmp = final_core->log_job.start_time;
313
        start_tm = localtime(&start_time_tmp);
314

315 316
        /* construct log file name */
        darshan_get_logfile_name(logfile_name, jobid, start_tm);
317 318 319 320 321 322 323 324 325
    }

    /* 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 */
326
        free(logfile_name);
327
        darshan_core_cleanup(final_core);
328 329 330
        return;
    }

331
    final_core->log_job.end_time = time(NULL);
332

333 334 335
    /* reduce to report first start time and last end time across all ranks
     * at rank 0
     */
336 337
    DARSHAN_MPI_CALL(PMPI_Reduce)(&final_core->log_job.start_time, &first_start_time, 1, MPI_LONG_LONG, MPI_MIN, 0, MPI_COMM_WORLD);
    DARSHAN_MPI_CALL(PMPI_Reduce)(&final_core->log_job.end_time, &last_end_time, 1, MPI_LONG_LONG, MPI_MAX, 0, MPI_COMM_WORLD);
338 339
    if(my_rank == 0)
    {
340 341
        final_core->log_job.start_time = first_start_time;
        final_core->log_job.end_time = last_end_time;
342
    }
343

344 345 346
    /* 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);

347
    /* get a list of records which are shared across all processes */
348
    darshan_get_shared_records(final_core, shared_recs);
349

350 351
    if(internal_timing_flag)
        open1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
352
    /* collectively open the darshan log file */
353
    ret = darshan_log_open_all(logfile_name, &log_fh);
354 355
    if(internal_timing_flag)
        open2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
356 357 358 359 360 361 362 363

    /* 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)
        {
364 365
            fprintf(stderr, "darshan library warning: unable to open log file %s\n",
                logfile_name);
366 367 368
            unlink(logfile_name);
        }
        free(logfile_name);
369
        darshan_core_cleanup(final_core);
370 371 372
        return;
    }

373 374
    if(internal_timing_flag)
        job1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
375
    /* rank 0 is responsible for writing the compressed darshan job information */
Shane Snyder's avatar
Shane Snyder committed
376
    if(my_rank == 0)
377
    {
378 379 380
        void *pointers[2] = {&final_core->log_job, final_core->trailing_data};
        int lengths[2] = {sizeof(struct darshan_job), DARSHAN_EXE_LEN+1};
        int comp_buf_sz = 0;
381

382
        /* compress the job info and the trailing mount/exe data */
383
        all_ret = darshan_deflate_buffer(pointers, lengths, 2, 0,
384 385
            final_core->comp_buf, &comp_buf_sz);
        if(all_ret)
386
        {
387
            fprintf(stderr, "darshan library warning: unable to compress job data\n");
388
            unlink(logfile_name);
389
        }
390 391 392
        else
        {
            /* write the job information, preallocing space for the log header */
393 394 395
            gz_fp += sizeof(struct darshan_header) + 23; /* gzip headers/trailers ... */
            all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, gz_fp,
                final_core->comp_buf, comp_buf_sz, MPI_BYTE, &status);
396 397 398 399 400
            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);
Shane Snyder's avatar
Shane Snyder committed
401
                
402
            }
Shane Snyder's avatar
Shane Snyder committed
403

404 405
            /* set the beginning offset of record hash, which follows job info just written */
            gz_fp += comp_buf_sz;
406
        }
407 408
    }

409 410 411 412 413
    /* 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);
414
        darshan_core_cleanup(final_core);
415 416
        return;
    }
417 418
    if(internal_timing_flag)
        job2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
419

420 421
    if(internal_timing_flag)
        rec1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
422
    /* write the record name->id hash to the log file */
423 424
    ret = darshan_log_write_record_hash(log_fh, final_core, &gz_fp);
    tmp_off = final_core->log_header.rec_map.off + final_core->log_header.rec_map.len;
425

426
    /* error out if unable to write record hash */
427 428 429 430 431 432
    DARSHAN_MPI_CALL(PMPI_Allreduce)(&ret, &all_ret, 1, MPI_INT,
        MPI_LOR, MPI_COMM_WORLD);
    if(all_ret != 0)
    {
        if(my_rank == 0)
        {
433
            fprintf(stderr, "darshan library warning: unable to write record hash to log file %s\n",
434
                logfile_name);
435
            unlink(logfile_name);
436 437
        }
        free(logfile_name);
438
        darshan_core_cleanup(final_core);
439 440
        return;
    }
Shane Snyder's avatar
Shane Snyder committed
441 442
    if(internal_timing_flag)
        rec2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
443 444

    /* loop over globally used darshan modules and:
445
     *      - perform shared file reductions, if possible
446
     *      - get final output buffer
447
     *      - compress (zlib) provided output buffer
Shane Snyder's avatar
Shane Snyder committed
448
     *      - append compressed buffer to log file
449 450
     *      - add module index info (file offset/length) to log header
     *      - shutdown the module
451
     */
452
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
453
    {
454
        struct darshan_core_module* this_mod = final_core->mod_array[i];
455
        struct darshan_core_record_ref *ref = NULL;
456 457
        darshan_record_id mod_shared_recs[DARSHAN_CORE_MAX_RECORDS];
        int mod_shared_rec_cnt = 0;
458
        void* mod_buf = NULL;
459
        int mod_buf_sz = 0;
460
        int j;
461

462
        if(global_mod_use_count[i] == 0)
463 464
        {
            if(my_rank == 0)
465 466 467 468
            {
                final_core->log_header.mod_map[i].off = 0;
                final_core->log_header.mod_map[i].len = 0;
            }
469
            continue;
470
        }
471 472
 
        if(internal_timing_flag)
473
            mod1[i] = DARSHAN_MPI_CALL(PMPI_Wtime)();
474

475 476 477 478 479 480 481 482
        /* set the shared file list for this module */
        memset(mod_shared_recs, 0, DARSHAN_CORE_MAX_RECORDS * sizeof(darshan_record_id));
        for(j = 0; j < DARSHAN_CORE_MAX_RECORDS && shared_recs[j] != 0; j++)
        {
            HASH_FIND(hlink, final_core->rec_hash, &shared_recs[j],
                sizeof(darshan_record_id), ref);
            assert(ref);
            if(DARSHAN_CORE_MOD_ISSET(ref->global_mod_flags, i))
483
            {
484
                mod_shared_recs[mod_shared_rec_cnt++] = shared_recs[j];
485
            }
486
        }
487

488 489 490 491 492
        /* if module is registered locally, get the corresponding output buffer
         * 
         * NOTE: this function can be used to run collective operations across
         * modules, if there are file records shared globally.
         */
493
        if(this_mod)
494
        {
495 496
            this_mod->mod_funcs.get_output_data(MPI_COMM_WORLD, mod_shared_recs,
                mod_shared_rec_cnt, &mod_buf, &mod_buf_sz);
497 498
        }

499
        final_core->log_header.mod_map[i].off = tmp_off;
500

501 502 503 504
        /* append this module's data to the darshan log */
        ret = darshan_log_append_all(log_fh, final_core, mod_buf, mod_buf_sz,
            &gz_fp, &(final_core->log_header.mod_map[i].len));
        tmp_off += final_core->log_header.mod_map[i].len;
505

506
        /* error out if the log append failed */
507 508 509
        DARSHAN_MPI_CALL(PMPI_Allreduce)(&ret, &all_ret, 1, MPI_INT,
            MPI_LOR, MPI_COMM_WORLD);
        if(all_ret != 0)
510
        {
511 512 513 514 515 516 517 518
            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);
519
            darshan_core_cleanup(final_core);
520
            return;
521 522 523
        }

        /* shutdown module if registered locally */
524
        if(this_mod)
525 526 527
        {
            this_mod->mod_funcs.shutdown();
        }
528 529
        if(internal_timing_flag)
            mod2[i] = DARSHAN_MPI_CALL(PMPI_Wtime)();
530 531
    }

532 533
    if(internal_timing_flag)
        header1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
534
    /* rank 0 is responsible for writing the log header */
535 536
    if(my_rank == 0)
    {
537 538 539
        void *header_buf = &(final_core->log_header);
        int header_buf_sz = sizeof(struct darshan_header);
        int comp_buf_sz = 0;
540

541 542 543 544 545 546 547 548 549 550 551 552 553 554
        /* initialize the remaining header fields */
        strcpy(final_core->log_header.version_string, DARSHAN_LOG_VERSION);
        final_core->log_header.magic_nr = DARSHAN_MAGIC_NR;

        /* deflate the header */
        /* NOTE: the header is not actually compressed because space for it must
         *       be preallocated before writing. i.e., the "compressed" header
         *       must be constant sized, sizeof(struct darshan_header) + 23.
         *       it is still necessary to deflate the header or the resulting log
         *       file will not be a valid gzip file.
         */
        all_ret = darshan_deflate_buffer((void **)&header_buf, &header_buf_sz, 1, 1,
            final_core->comp_buf, &comp_buf_sz);
        if(all_ret)
555
        {
556
            fprintf(stderr, "darshan library warning: unable to compress header\n");
557
            unlink(logfile_name);
558
        }
559 560 561 562 563 564 565 566 567 568 569
        else
        {
            all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, 0, final_core->comp_buf,
                comp_buf_sz, 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);
            }
        }
570 571
    }

572 573 574 575 576
    /* 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);
577
        darshan_core_cleanup(final_core);
578 579
        return;
    }
580 581
    if(internal_timing_flag)
        header2 = DARSHAN_MPI_CALL(PMPI_Wtime)();
582

583 584 585 586 587 588
    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.gz, which indicates that this log file is
     * complete and ready for analysis
     */
589 590
    if(my_rank == 0)
    {
Shane Snyder's avatar
Shane Snyder committed
591
        if(getenv("DARSHAN_LOGFILE"))
592
        {
593
#ifdef __CP_GROUP_READABLE_LOGS
Shane Snyder's avatar
Shane Snyder committed
594
            chmod(logfile_name, (S_IRUSR|S_IRGRP));
595
#else
Shane Snyder's avatar
Shane Snyder committed
596
            chmod(logfile_name, (S_IRUSR));
597
#endif
Shane Snyder's avatar
Shane Snyder committed
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
        }
        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.gz", (int)(end_log_time-start_log_time+1));
                rename(logfile_name, new_logfile_name);
                /* set permissions on log file */
#ifdef __CP_GROUP_READABLE_LOGS
                chmod(new_logfile_name, (S_IRUSR|S_IRGRP));
#else
                chmod(new_logfile_name, (S_IRUSR));
#endif
                free(new_logfile_name);
            }
622
        }
623
    }
624

625
    free(logfile_name);
626
    darshan_core_cleanup(final_core);
627

628
    if(internal_timing_flag)
629
    {
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
        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];
        double all_tm, all_slowest;

        tm_end = DARSHAN_MPI_CALL(PMPI_Wtime)();

        open_tm = open2 - open1;
        header_tm = header2 - header1;
        job_tm = job2 - job1;
        rec_tm = rec2 - rec1;
        all_tm = tm_end - start_log_time;
        for(i = 0;i < DARSHAN_MAX_MODS; i++)
        {
            mod_tm[i] = mod2[i] - mod1[i];
        }

        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);
        DARSHAN_MPI_CALL(PMPI_Reduce)(&all_tm, &all_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
        DARSHAN_MPI_CALL(PMPI_Reduce)(mod_tm, mod_slowest, DARSHAN_MAX_MODS,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);

        if(my_rank == 0)
        {
            printf("#darshan:<op>\t<nprocs>\t<time>\n");
            printf("darshan:log_open\t%d\t%f\n", nprocs, open_slowest);
            printf("darshan:job_write\t%d\t%f\n", nprocs, job_slowest);
            printf("darshan:hash_write\t%d\t%f\n", nprocs, rec_slowest);
Shane Snyder's avatar
Shane Snyder committed
668
            printf("darshan:header_write\t%d\t%f\n", nprocs, header_slowest);
669 670 671 672
            for(i = 0; i < DARSHAN_MAX_MODS; i++)
            {
                if(global_mod_use_count[i])
                    printf("darshan:%s_shutdown\t%d\t%f\n", darshan_module_names[i],
Shane Snyder's avatar
Shane Snyder committed
673
                        nprocs, mod_slowest[i]);
674 675 676
            }
            printf("darshan:core_shutdown\t%d\t%f\n", nprocs, all_slowest);
        }
677 678 679 680
    }
    
    return;
}
681

Shane Snyder's avatar
Shane Snyder committed
682
/* *********************************** */
683

684
/* construct the darshan log file name */
685
static void darshan_get_logfile_name(char* logfile_name, int jobid, struct tm* start_tm)
686
{
Shane Snyder's avatar
Shane Snyder committed
687
    char* user_logfile_name;
688 689 690 691 692 693 694 695 696 697 698 699 700
    char* logpath;
    char* logname_string;
    char* logpath_override = NULL;
#ifdef __CP_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;

Shane Snyder's avatar
Shane Snyder committed
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
    /* 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
716
    {
Shane Snyder's avatar
Shane Snyder committed
717 718 719 720 721 722
        /* otherwise, generate the log path automatically */

        /* Use CP_LOG_PATH_OVERRIDE for the value or __CP_LOG_PATH */
        logpath = getenv(CP_LOG_PATH_OVERRIDE);
        if(!logpath)
        {
723
#ifdef __CP_LOG_PATH
Shane Snyder's avatar
Shane Snyder committed
724
            logpath = __CP_LOG_PATH;
725
#endif
Shane Snyder's avatar
Shane Snyder committed
726
        }
727

Shane Snyder's avatar
Shane Snyder committed
728 729 730 731 732 733 734 735 736 737
        /* 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.
         */
738 739

#ifndef DARSHAN_DISABLE_CUSERID
Shane Snyder's avatar
Shane Snyder committed
740
        cuserid(cuser);
741 742
#endif

Shane Snyder's avatar
Shane Snyder committed
743 744
        /* if cuserid() didn't work, then check the environment */
        if(strcmp(cuser, "") == 0)
745
        {
Shane Snyder's avatar
Shane Snyder committed
746 747 748 749 750
            logname_string = getenv("LOGNAME");
            if(logname_string)
            {
                strncpy(cuser, logname_string, (L_cuserid-1));
            }
751 752
        }

Shane Snyder's avatar
Shane Snyder committed
753 754 755 756 757 758
        /* if cuserid() and environment both fail, then fall back to uid */
        if(strcmp(cuser, "") == 0)
        {
            uid_t uid = geteuid();
            snprintf(cuser, sizeof(cuser), "%u", uid);
        }
759

Shane Snyder's avatar
Shane Snyder committed
760 761 762 763
        /* 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);
764

Shane Snyder's avatar
Shane Snyder committed
765 766 767 768
        /* 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.
         */
769
#ifdef __CP_LOG_ENV
Shane Snyder's avatar
Shane Snyder committed
770 771
        /* just silently skip if the environment variable list is too big */
        if(strlen(__CP_LOG_ENV) < 256)
772
        {
Shane Snyder's avatar
Shane Snyder committed
773 774 775 776 777
            /* copy env variable list to a temporary buffer */
            strcpy(env_check, __CP_LOG_ENV);
            /* tokenize the comma-separated list */
            env_tok = strtok(env_check, ",");
            if(env_tok)
778
            {
Shane Snyder's avatar
Shane Snyder committed
779
                do
780
                {
Shane Snyder's avatar
Shane Snyder committed
781 782 783 784 785 786 787 788 789
                    /* 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, ",")));
            }
790 791 792
        }
#endif

Shane Snyder's avatar
Shane Snyder committed
793
        if(logpath_override)
794
        {
Shane Snyder's avatar
Shane Snyder committed
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
            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);
            }
810
        }
Shane Snyder's avatar
Shane Snyder committed
811
        else if(logpath)
812
        {
Shane Snyder's avatar
Shane Snyder committed
813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
            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';
833 834 835 836
        }
    }

    return;
837 838
}

839
/* record any hints used to write the darshan log in the log header */
840
static void darshan_log_record_hints_and_ver(struct darshan_core_runtime* core)
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863
{
    char* hints;
    char* header_hints;
    int meta_remain = 0;
    char* m;

    /* check environment variable to see if the default MPI file hints have
     * been overridden
     */
    hints = getenv(CP_LOG_HINTS_OVERRIDE);
    if(!hints)
    {
        hints = __CP_LOG_HINTS;
    }

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

    header_hints = strdup(hints);
    if(!header_hints)
        return;

    meta_remain = DARSHAN_JOB_METADATA_LEN -
864
        strlen(core->log_job.metadata) - 1;
865 866
    if(meta_remain >= (strlen(PACKAGE_VERSION) + 9))
    {
867
        sprintf(core->log_job.metadata, "lib_ver=%s\n", PACKAGE_VERSION);
868 869 870 871
        meta_remain -= (strlen(PACKAGE_VERSION) + 9);
    }
    if(meta_remain >= (3 + strlen(header_hints)))
    {
872
        m = core->log_job.metadata + strlen(core->log_job.metadata);
873 874 875 876 877 878 879 880 881 882 883 884
        /* We have room to store the hints in the metadata portion of
         * the job header.  We just prepend an h= to the hints list.  The
         * metadata parser will ignore = characters that appear in the value
         * portion of the metadata key/value pair.
         */
        sprintf(m, "h=%s\n", header_hints);
    }
    free(header_hints);

    return;
}

885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
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 */
static void add_entry(char* trailing_data, int* space_left, struct mntent *entry)
{
    int ret;
    char tmp_mnt[256];
    struct statfs statfsbuf;

    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);
    if(ret == 0 && statfsbuf.f_type != LL_SUPER_MAGIC)
        mnt_data_array[mnt_data_count].block_size = statfsbuf.f_bsize;
    else if(ret == 0 && statfsbuf.f_type == LL_SUPER_MAGIC)
        mnt_data_array[mnt_data_count].block_size = 1024*1024;
    else
        mnt_data_array[mnt_data_count].block_size = 4096;

    /* store mount information for use in header of darshan log */
925
    ret = snprintf(tmp_mnt, 256, "\n%s\t%s",
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
        entry->mnt_type, entry->mnt_dir);
    if(ret < 256 && strlen(tmp_mnt) <= (*space_left))
    {
        strcat(trailing_data, tmp_mnt);
        (*space_left) -= strlen(tmp_mnt);
    }

    mnt_data_count++;
    return;
}

/* darshan_get_exe_and_mounts_root()
 *
 * collects command line and list of mounted file systems into a string that
 * will be stored with the job header
 */
static void darshan_get_exe_and_mounts_root(struct darshan_core_runtime *core,
    char* trailing_data, int space_left)
{
    FILE* tab;
    struct mntent *entry;
    char* exclude;
    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
    };

    /* length of exe has already been safety checked in darshan-posix.c */
    strcat(trailing_data, core->exe);
971
    space_left = DARSHAN_EXE_LEN - strlen(trailing_data);
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028