darshan-core.c 56 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 <sys/types.h>
#include <sys/stat.h>
24
#include <sys/mman.h>
25
#include <sys/vfs.h>
26
#include <zlib.h>
27
#include <mpi.h>
28
#include <assert.h>
29

30
#include "uthash.h"
Shane Snyder's avatar
Shane Snyder committed
31
#include "darshan.h"
32
#include "darshan-core.h"
Shane Snyder's avatar
Shane Snyder committed
33
#include "darshan-dynamic.h"
34

35
extern char* __progname;
36
extern char* __progname_full;
37

38
/* internal variable delcarations */
39
static struct darshan_core_runtime *darshan_core = NULL;
40
static pthread_mutex_t darshan_core_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
41
static int my_rank = -1;
42
static int nprocs = -1;
43
static int darshan_mem_alignment = 1;
44

45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
/* 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
};

60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
#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
};

Shane Snyder's avatar
Shane Snyder committed
75
76
77
#define DARSHAN_CORE_LOCK() pthread_mutex_lock(&darshan_core_mutex)
#define DARSHAN_CORE_UNLOCK() pthread_mutex_unlock(&darshan_core_mutex)

78
79
80
81
82
83
/* FS mount information */
#define DARSHAN_MAX_MNTS 64
#define DARSHAN_MAX_MNT_PATH 256
#define DARSHAN_MAX_MNT_TYPE 32
struct mnt_data
{
84
    int block_size;
85
86
87
88
89
90
    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;

91
92
/* prototypes for internal helper functions */
static void darshan_log_record_hints_and_ver(
93
    struct darshan_core_runtime* core);
94
95
static void darshan_get_exe_and_mounts(
    struct darshan_core_runtime *core, int argc, char **argv);
96
97
98
static void darshan_add_record_hashref(
    struct darshan_core_runtime *core, char *name,
    darshan_record_id id, struct darshan_core_record_ref **ref);
99
100
static int darshan_block_size_from_path(
    const char *path);
101
102
static void darshan_get_user_name(
    char *user);
103
104
static void darshan_get_logfile_name(
    char* logfile_name, int jobid, struct tm* start_tm);
105
static void darshan_get_shared_records(
106
107
    struct darshan_core_runtime *core, darshan_record_id **shared_recs,
    int *shared_rec_cnt);
108
static int darshan_log_open_all(
109
    char *logfile_name, MPI_File *log_fh);
110
static int darshan_deflate_buffer(
Shane Snyder's avatar
Shane Snyder committed
111
112
    void **pointers, int *lengths, int count, char *comp_buf,
    int *comp_buf_length);
113
static int darshan_log_write_record_hash(
114
    MPI_File log_fh, struct darshan_core_runtime *core,
115
116
117
    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
118
    int count, uint64_t *inout_off);
Shane Snyder's avatar
Shane Snyder committed
119
120
static void darshan_core_cleanup(
    struct darshan_core_runtime* core);
121

122
123
/* *********************************** */

Shane Snyder's avatar
Shane Snyder committed
124
void darshan_core_initialize(int argc, char **argv)
125
{
126
    struct darshan_core_runtime *init_core = NULL;
127
128
    int internal_timing_flag = 0;
    double init_start, init_time, init_max;
129
    char *envstr;
130
131
    char *jobid_str;
    int jobid;
132
133
    int ret;
    int tmpval;
134
    int i;
135
136
137
138
139
140
141
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
    int mmap_fd;
    int mmap_size;
    int sys_page_size;
    char cuser[L_cuserid] = {0};
    char *mmap_log_dir;
#endif
142
143

    DARSHAN_MPI_CALL(PMPI_Comm_size)(MPI_COMM_WORLD, &nprocs);
144
    DARSHAN_MPI_CALL(PMPI_Comm_rank)(MPI_COMM_WORLD, &my_rank);
145
146
147
148

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

149
    if(internal_timing_flag)
150
151
152
        init_start = DARSHAN_MPI_CALL(PMPI_Wtime)();

    /* setup darshan runtime if darshan is enabled and hasn't been initialized already */
153
    if(!getenv("DARSHAN_DISABLE") && !darshan_core)
154
    {
155
        #if (__DARSHAN_MEM_ALIGNMENT < 1)
156
157
            #error Darshan must be configured with a positive value for --with-mem-align
        #endif
158
        envstr = getenv(DARSHAN_MEM_ALIGNMENT_OVERRIDE);
159
160
161
162
163
164
165
166
167
168
169
        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
        {
170
            darshan_mem_alignment = __DARSHAN_MEM_ALIGNMENT;
171
172
173
        }

        /* avoid floating point errors on faulty input */
174
        if(darshan_mem_alignment < 1)
175
176
177
        {
            darshan_mem_alignment = 1;
        }
178

179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
        /* 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();
        }

199
200
201
        /* allocate structure to track darshan core runtime information */
        init_core = malloc(sizeof(*init_core));
        if(init_core)
202
        {
203
204
205
            memset(init_core, 0, sizeof(*init_core));
            init_core->wtime_offset = DARSHAN_MPI_CALL(PMPI_Wtime)();

206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
#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);
            init_core->log_rec_p = malloc(DARSHAN_RECORD_BUF_SIZE);
            init_core->log_mod_p = malloc(DARSHAN_MOD_MEM_MAX);

            if(!(init_core->log_hdr_p) || !(init_core->log_job_p) ||
               !(init_core->log_exemnt_p) || !(init_core->log_rec_p) ||
               !(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);
            memset(init_core->log_rec_p, 0, DARSHAN_RECORD_BUF_SIZE);
            memset(init_core->log_mod_p, 0, DARSHAN_MOD_MEM_MAX);
#else
            /* if mmap logs are enabled, we need to initialize the mmap region
             * before setting the corresponding log file region pointers
             */

232
233
            sys_page_size = sysconf(_SC_PAGESIZE);
            assert(sys_page_size > 0);
234

235
            mmap_size = sizeof(struct darshan_header) + DARSHAN_JOB_RECORD_SIZE +
236
                + DARSHAN_RECORD_BUF_SIZE + DARSHAN_MOD_MEM_MAX;
237
238
            if(mmap_size % sys_page_size)
                mmap_size = ((mmap_size / sys_page_size) + 1) * sys_page_size;
239

240
241
242
243
244
245
246
247
            envstr = getenv(DARSHAN_MMAP_LOG_PATH_OVERRIDE);
            if(envstr)
                mmap_log_dir = envstr;
            else
                mmap_log_dir = DARSHAN_DEF_MMAP_LOG_PATH;

            darshan_get_user_name(cuser);

248
249
250
            /* construct a unique temporary log file name for this process
             * to write mmap log data to
             */
251
252
253
            snprintf(init_core->mmap_log_name, PATH_MAX,
                "/%s/%s_%s_id%d_mmap-log-%d.darshan",
                mmap_log_dir, cuser, __progname, jobid, my_rank);
254
255

            /* create the temporary mmapped darshan log */
256
            mmap_fd = open(init_core->mmap_log_name, O_CREAT|O_RDWR|O_EXCL , 0644);
257
            if(mmap_fd < 0)
258
            {
259
                fprintf(stderr, "darshan library warning: "
260
                    "unable to create darshan log file %s\n", init_core->mmap_log_name);
261
262
                free(init_core);
                return;
263
264
            }

265
            /* TODO: what's more expensive? truncate or write zeros? perf test this call and later accesses */
266
267
268
269
270
            /* allocate the necessary space in the log file */
            ret = ftruncate(mmap_fd, mmap_size);
            if(ret < 0)
            {
                fprintf(stderr, "darshan library warning: "
271
                    "unable to allocate darshan log file %s\n", init_core->mmap_log_name);
272
273
                free(init_core);
                close(mmap_fd);
274
                unlink(init_core->mmap_log_name);
275
276
277
278
279
                return;
            }

            /* memory map buffers for getting at least some summary i/o data
             * into a log file if darshan does not shut down properly
280
             */
281
282
            void *mmap_p = mmap(NULL, mmap_size, PROT_WRITE, MAP_SHARED, mmap_fd, 0);
            if(mmap_p == MAP_FAILED)
283
            {
284
                fprintf(stderr, "darshan library warning: "
285
                    "unable to mmap darshan log file %s\n", init_core->mmap_log_name);
286
287
                free(init_core);
                close(mmap_fd);
288
                unlink(init_core->mmap_log_name);
289
                return;
290
291
            }

292
293
294
            /* close darshan log file (this does *not* unmap the log file) */
            close(mmap_fd);

295
            /* set the memory pointers for each log file region */
296
            init_core->log_hdr_p = (struct darshan_header *)mmap_p;
297
            init_core->log_job_p = (struct darshan_job *)
298
                ((char *)init_core->log_hdr_p + sizeof(struct darshan_header));
299
            init_core->log_exemnt_p = (char *)
300
301
302
303
304
                ((char *)init_core->log_job_p + sizeof(struct darshan_job));
            init_core->log_rec_p = (void *)
                ((char *)init_core->log_exemnt_p + DARSHAN_EXE_LEN + 1);
            init_core->log_mod_p = (void *)
                ((char *)init_core->log_rec_p + DARSHAN_RECORD_BUF_SIZE);
305

306
            /* set header fields needed for the mmap log mechanism */
307
            init_core->log_hdr_p->comp_type = DARSHAN_NO_COMP;
308
309
            init_core->log_hdr_p->rec_map.off =
                sizeof(struct darshan_header) + DARSHAN_JOB_RECORD_SIZE;
310
311
312
313
314
#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;
315

316
317
318
319
320
            /* 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;
321
322
323
324
325
326

            /* 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);

327
            /* collect information about command line and mounted file systems */
328
            darshan_get_exe_and_mounts(init_core, argc, argv);
329

Shane Snyder's avatar
Shane Snyder committed
330
            /* bootstrap any modules with static initialization routines */
331
332
333
334
335
336
337
338
            i = 0;
            while(mod_static_init_fns[i])
            {
                (*mod_static_init_fns[i])();
                i++;
            }

            darshan_core = init_core;
339
        }
340
341
    }

342
343
344
345
    /* reduce so all ranks agree on the job start time */
    DARSHAN_MPI_CALL(PMPI_Allreduce)(MPI_IN_PLACE, &init_core->log_job_p->start_time,
        1, MPI_INT64_T, MPI_MIN, MPI_COMM_WORLD);

346
347
348
349
350
    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);
351
        if(my_rank == 0)
352
        {
353
354
            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
            fprintf(stderr, "darshan:init\t%d\t%f\n", nprocs, init_max);
355
356
357
358
359
360
        }
    }

    return;
}

Shane Snyder's avatar
Shane Snyder committed
361
void darshan_core_shutdown()
362
{
363
    struct darshan_core_runtime *final_core;
364
365
    struct darshan_header out_header;
    struct darshan_job out_job;
366
    int internal_timing_flag = 0;
367
368
369
    struct tm *start_tm;
    time_t start_time_tmp;
    int64_t last_end_time;
370
    double start_log_time;
371
    double tm_end;
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
    double open1, open2;
    double job1, job2;
    double rec1, rec2;
    double mod1[DARSHAN_MAX_MODS] = {0};
    double mod2[DARSHAN_MAX_MODS] = {0};
    double header1, header2;
    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;
390
391
392
393

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

394
395
    if(internal_timing_flag)
        start_log_time = DARSHAN_MPI_CALL(PMPI_Wtime)();
396

Shane Snyder's avatar
Shane Snyder committed
397
    /* disable darhan-core while we shutdown */
398
    DARSHAN_CORE_LOCK();
399
    if(!darshan_core)
400
    {
401
        DARSHAN_CORE_UNLOCK();
402
403
        return;
    }
404
405
    final_core = darshan_core;
    darshan_core = NULL;
406
407
    DARSHAN_CORE_UNLOCK();

408
409
410
411
    memcpy(&out_job, final_core->log_job_p, sizeof(struct darshan_job));

#ifdef __DARSHAN_ENABLE_MMAP_LOGS
    /* TODO: can we get rid of out_ header and job?? */
412
413
    /* XXX just copy mmap files somewhere else to avoid corruption */
    DARSHAN_MPI_CALL(PMPI_Barrier)(MPI_COMM_WORLD);
414
415
416
    char cp_cmd[500] = {0};
    sprintf(cp_cmd, "cp %s ~/Desktop", final_core->mmap_log_name);
    system(cp_cmd);
417
418
419
420
421
422
423
424
425
426
    DARSHAN_MPI_CALL(PMPI_Barrier)(MPI_COMM_WORLD);

    /* indicate in the metadata field of the temporary darshan log file that
     * the darshan shutdown process was invoked on the data in the log. since
     * we have no way of knowing how far the shutdown process got, the data
     * could potentially be in inconsistent or corrupt state. in this case,
     * darshan currently does not generate a log file at all.
     */
    char *m = final_core->log_job_p->metadata + strlen(final_core->log_job_p->metadata);
    int meta_remain = DARSHAN_JOB_METADATA_LEN - strlen(final_core->log_job_p->metadata) - 1;
427
    /* TODO: do we ever check for darshan_shutdown? */
428
    snprintf(m, meta_remain, "darshan_shutdown=yes\n");
429
#endif
Shane Snyder's avatar
Shane Snyder committed
430

431
    /* we also need to set which modules were registered on this process and
432
433
     * call into those modules and give them a chance to perform any necessary
     * pre-shutdown steps.
Shane Snyder's avatar
Shane Snyder committed
434
435
436
437
438
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
    {
        if(final_core->mod_array[i])
        {
439
            local_mod_use[i] = 1;
440
            final_core->mod_array[i]->mod_funcs.begin_shutdown();
Shane Snyder's avatar
Shane Snyder committed
441
442
        }
    }
443

444
445
446
447
448
449
    final_core->comp_buf = malloc(DARSHAN_COMP_BUF_SIZE);
    if(!(final_core->comp_buf))
    {
        darshan_core_cleanup(final_core);
        return;
    }
450

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
    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;
    }
479

480
    final_core->log_job_p->end_time = time(NULL);
481

482
    /* reduce to report last end time across all ranks at rank 0 */
483
    DARSHAN_MPI_CALL(PMPI_Reduce)(&final_core->log_job_p->end_time, &last_end_time,
484
        1, MPI_INT64_T, MPI_MAX, 0, MPI_COMM_WORLD);
485
486
487
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
531
532
533
534
535
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
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
    if(my_rank == 0)
    {
        out_job.end_time = last_end_time;
    }

    /* 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)
    {
        void *pointers[2] = {&out_job, final_core->log_exemnt_p};
        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 */
    out_header.rec_map.off = gz_fp;
    ret = darshan_log_write_record_hash(log_fh, final_core, &gz_fp);
    out_header.rec_map.len = gz_fp - out_header.rec_map.off;

    /* error out if unable to write record hash */
    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:
     *      - perform shared file reductions, if possible
     *      - get final output buffer
     *      - compress (zlib) provided output buffer
     *      - append compressed buffer to log file
     *      - add module index info (file offset/length) to log header
     *      - shutdown the module
     */
    for(i = 0; i < DARSHAN_MAX_MODS; i++)
    {
        struct darshan_core_module* this_mod = final_core->mod_array[i];
        struct darshan_core_record_ref *ref = NULL;
        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)
            {
                out_header.mod_map[i].off = 0;
                out_header.mod_map[i].len = 0;
            }
            continue;
        }

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

        /* set the shared file list for this module */
        memset(mod_shared_recs, 0, shared_rec_cnt * sizeof(darshan_record_id));
        for(j = 0; j < shared_rec_cnt; j++)
        {
            HASH_FIND(hlink, final_core->rec_hash, &shared_recs[j],
                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
         * modules, if there are file records shared globally.
         */
        if(this_mod)
        {
            this_mod->mod_funcs.get_output_data(MPI_COMM_WORLD, mod_shared_recs,
                mod_shared_rec_cnt, &mod_buf, &mod_buf_sz);
        }

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

        /* 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;
        }

        /* shutdown module if registered locally */
        if(this_mod)
        {
            this_mod->mod_funcs.shutdown();
        }
        if(internal_timing_flag)
            mod2[i] = DARSHAN_MPI_CALL(PMPI_Wtime)();
    }

    if(internal_timing_flag)
        header1 = DARSHAN_MPI_CALL(PMPI_Wtime)();
    /* write out log header, after running 2 reduction on header variables:
     *  1) reduce 'partial_flag' variable to determine which modules ran out
     *     of memory for storing I/O data
     *  2) reduce 'mod_ver' array to determine which log format version each
     *     module used for this output log
     */
    DARSHAN_MPI_CALL(PMPI_Reduce)(&(final_core->log_hdr_p->partial_flag),
        &(out_header.partial_flag), 1, MPI_UINT32_T, MPI_BOR, 0, MPI_COMM_WORLD);
689
690
691
    DARSHAN_MPI_CALL(PMPI_Reduce)(&(final_core->log_hdr_p->mod_ver),
        &(out_header.mod_ver), DARSHAN_MAX_MODS, MPI_UINT32_T, MPI_MAX,
        0, MPI_COMM_WORLD);
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
    if(my_rank == 0)
    {
        /* rank 0 is responsible for writing the log header */
        /* initialize the remaining header fields */
        strcpy(out_header.version_string, DARSHAN_LOG_VERSION);
        out_header.magic_nr = DARSHAN_MAGIC_NR;
        out_header.comp_type = DARSHAN_ZLIB_COMP;

        all_ret = DARSHAN_MPI_CALL(PMPI_File_write_at)(log_fh, 0, &out_header,
            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);
        }
    }

    /* 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)
    {
729
        mode_t chmod_mode = S_IRUSR;
730
#ifdef __DARSHAN_GROUP_READABLE_LOGS
731
        chmod_mode |= S_IRGRP;
732
#endif
733
734
735
736

        if(getenv("DARSHAN_LOGFILE"))
        {
            chmod(logfile_name, chmod_mode);
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
        }
        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 */
754
                chmod(new_logfile_name, chmod_mode);
755
756
757
758
759
                free(new_logfile_name);
            }
        }
    }

760
#ifdef __DARSHAN_ENABLE_MMAP_LOGS
761
762
    /* remove the temporary mmap log files */
    unlink(final_core->mmap_log_name);
763
#endif
764
765

    free(logfile_name);
766
767
    free(shared_recs);
    free(mod_shared_recs);
768
    darshan_core_cleanup(final_core);
769

770
    if(internal_timing_flag)
771
    {
772
773
774
775
776
        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];
777
778
779
780
        double all_tm, all_slowest;

        tm_end = DARSHAN_MPI_CALL(PMPI_Wtime)();

781
782
783
784
        open_tm = open2 - open1;
        header_tm = header2 - header1;
        job_tm = job2 - job1;
        rec_tm = rec2 - rec1;
785
        all_tm = tm_end - start_log_time;
786
787
788
789
        for(i = 0;i < DARSHAN_MAX_MODS; i++)
        {
            mod_tm[i] = mod2[i] - mod1[i];
        }
790

791
792
793
794
795
796
797
798
        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);
799
800
        DARSHAN_MPI_CALL(PMPI_Reduce)(&all_tm, &all_slowest, 1,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
801
802
        DARSHAN_MPI_CALL(PMPI_Reduce)(mod_tm, mod_slowest, DARSHAN_MAX_MODS,
            MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
803
804
805

        if(my_rank == 0)
        {
806
            fprintf(stderr, "#darshan:<op>\t<nprocs>\t<time>\n");
807
808
809
810
811
812
813
814
815
816
            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]);
            }
817
            fprintf(stderr, "darshan:core_shutdown\t%d\t%f\n", nprocs, all_slowest);
818
        }
819
    }
820

821
822
    return;
}
823

Shane Snyder's avatar
Shane Snyder committed
824
/* *********************************** */
825

826
/* record any hints used to write the darshan log in the job data */
827
static void darshan_log_record_hints_and_ver(struct darshan_core_runtime* core)
828
829
{
    char* hints;
830
    char* job_hints;
831
832
833
834
835
836
    int meta_remain = 0;
    char* m;

    /* check environment variable to see if the default MPI file hints have
     * been overridden
     */
837
    hints = getenv(DARSHAN_LOG_HINTS_OVERRIDE);
838
839
    if(!hints)
    {
840
        hints = __DARSHAN_LOG_HINTS;
841
842
843
844
845
    }

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

846
847
    job_hints = strdup(hints);
    if(!job_hints)
848
849
850
        return;

    meta_remain = DARSHAN_JOB_METADATA_LEN -
851
        strlen(core->log_job_p->metadata) - 1;
852
853
    if(meta_remain >= (strlen(PACKAGE_VERSION) + 9))
    {
854
        sprintf(core->log_job_p->metadata, "lib_ver=%s\n", PACKAGE_VERSION);
855
856
        meta_remain -= (strlen(PACKAGE_VERSION) + 9);
    }
857
    if(meta_remain >= (3 + strlen(job_hints)))
858
    {
859
        m = core->log_job_p->metadata + strlen(core->log_job_p->metadata);
860
        /* We have room to store the hints in the metadata portion of
861
         * the job structure.  We just prepend an h= to the hints list.  The
862
863
864
         * metadata parser will ignore = characters that appear in the value
         * portion of the metadata key/value pair.
         */
865
        sprintf(m, "h=%s\n", job_hints);
866
    }
867
    free(job_hints);
868
869
870
871

    return;
}

872
873
874
875
876
877
878
879
880
881
882
883
884
885
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 */
886
static void add_entry(char* buf, int* space_left, struct mntent *entry)
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
{
    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;

911
    /* store mount information with the job-level metadata in darshan log */
912
    ret = snprintf(tmp_mnt, 256, "\n%s\t%s",
913
914
915
        entry->mnt_type, entry->mnt_dir);
    if(ret < 256 && strlen(tmp_mnt) <= (*space_left))
    {
916
        strcat(buf, tmp_mnt);
917
918
919
920
921
922
923
        (*space_left) -= strlen(tmp_mnt);
    }

    mnt_data_count++;
    return;
}

924
/* darshan_get_exe_and_mounts()
925
926
 *
 * collects command line and list of mounted file systems into a string that
927
 * will be stored with the job-level metadata
928
 */
929
static void darshan_get_exe_and_mounts(struct darshan_core_runtime *core,
930
    int argc, char **argv)
931
932
933
934
{
    FILE* tab;
    struct mntent *entry;
    char* exclude;
935
936
937
938
    char* truncate_string = "<TRUNCATED>";
    int truncate_offset;
    int space_left = DARSHAN_EXE_LEN;
    int i;
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
    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
    };

960
961
962
    /* record exe and arguments */
    for(i=0; i<argc; i++)
    {
963
964
        strncat(core->log_exemnt_p, argv[i], space_left);
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
965
966
        if(i < (argc-1))
        {
967
968
            strncat(core->log_exemnt_p, " ", space_left);
            space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
969
970
971
972
973
974
975
976
        }
    }

    /* if we don't see any arguments, then use glibc symbol to get
     * program name at least (this happens in fortran)
     */
    if(argc == 0)
    {
977
978
979
980
        strncat(core->log_exemnt_p, __progname_full, space_left);
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
        strncat(core->log_exemnt_p, " <unknown args>", space_left);
        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
981
982
983
984
985
986
    }

    if(space_left == 0)
    {
        /* we ran out of room; mark that string was truncated */
        truncate_offset = DARSHAN_EXE_LEN - strlen(truncate_string);
987
        sprintf(&(core->log_exemnt_p[truncate_offset]), "%s",
988
989
990
            truncate_string);
    }

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
    /* 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
     */

    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;

1018
        add_entry(core->log_exemnt_p, &space_left, entry);
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
    }
    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;

1031
        add_entry(core->log_exemnt_p, &space_left, entry);
1032
1033
1034
    }
    endmntent(tab);

1035
    /* sort mount points in order of longest path to shortest path.  This is
1036
1037
1038
1039
1040
1041
1042
     * 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;
}

1043
static int darshan_block_size_from_path(const char *path)
1044
{
1045
    int i;
1046
    int block_size = -1;
1047

1048
    for(i=0; i<mnt_data_count; i++)
1049
    {
1050
        if(!(strncmp(mnt_data_array[i].path, path, strlen(mnt_data_array[i].path))))
1051
        {
1052
1053
            block_size = mnt_data_array[i].block_size;
            break;;
1054
1055
1056
        }
    }

1057
    return block_size;
1058
1059
}

1060
static void darshan_get_user_name(char *cuser)
1061
{
1062
    char* logname_string;
1063

1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
    /* 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)
1081
    {
1082
1083
        logname_string = getenv("LOGNAME");
        if(logname_string)
1084
        {
1085
            strncpy(cuser, logname_string, (L_cuserid-1));
1086
1087
1088
        }
    }

1089
1090
1091
1092
1093
1094
1095
    /* 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);
    }

1096
1097
1098
    return;
}

1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
/* 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
        }

1142
        darshan_get_user_name(cuser);
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
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
1216
1217
1218
1219
1220
1221
1222

        /* 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;
}

1223
1224
1225
1226
static void darshan_add_record_hashref(struct darshan_core_runtime *core,
    char *name, darshan_record_id id, struct darshan_core_record_ref **ref)
{
    int record_size = sizeof(darshan_record_id) + strlen(name) + 1;
1227
1228
    darshan_record_id *id_p;
    char *name_p;
1229
1230
1231
1232
1233
1234
1235
1236
1237

    if((record_size + core->log_hdr_p->rec_map.len) > DARSHAN_RECORD_BUF_SIZE)
        return;

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

1238
1239
1240
1241
1242
1243
        /* serialize the record id and name into the record map buffer */
        id_p = (darshan_record_id *)
            ((char *)core->log_rec_p + core->log_hdr_p->rec_map.len);
        *id_p = id;
        name_p = (char *)id_p + sizeof(darshan_record_id);
        strcpy(name_p, name);
1244

1245
1246
        /* save pointer to this record mapping buffer */
        (*ref)->rec_p = id_p;
1247

1248
1249
        /* add the record to the hash table */
        HASH_ADD_KEYPTR(hlink, core->rec_hash, id_p, sizeof(darshan_record_id), (*ref));
1250
1251
1252
1253
1254
1255
1256
        core->rec_hash_cnt++;
        core->log_hdr_p->rec_map.len += record_size;
    }

    return;
}

1257
static void darshan_get_shared_records(struct darshan_core_runtime *core,
1258
    darshan_record_id **shared_recs, int *shared_rec_cnt)
1259
{
1260
    int i, j;
1261
    int tmp_cnt = core->rec_hash_cnt;
1262
    struct darshan_core_record_ref *tmp, *ref;
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
    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));
1280
1281
1282
1283

    /* first, determine list of records root process has opened */
    if(my_rank == 0)
    {
1284
        i = 0;
1285
        HASH_ITER(hlink, core->rec_hash, ref, tmp)
1286
        {
1287
1288
            /* dereference the record pointer to get corresponding id */
            id_array[i++] = *(darshan_record_id *)ref->rec_p;
1289
1290
1291
1292
        }
    }

    /* broadcast root's list of records to all other processes */
1293
    DARSHAN_MPI_CALL(PMPI_Bcast)(id_array, (tmp_cnt * sizeof(darshan_record_id)),
1294
1295
1296
        MPI_BYTE, 0, MPI_COMM_WORLD);

    /* everyone looks to see if they opened the same records as root */
1297
    for(i=0; i<tmp_cnt; i++)
1298
    {
1299
1300
        HASH_FIND(hlink, core->rec_hash, &id_array[i], sizeof(darshan_record_id), ref);
        if(ref)
1301
        {
1302
1303
            /* we opened that record too, save the mod_flags */
            mod_flags[i] = ref->mod_flags;
1304
1305
1306
        }
    }

1307
1308
1309
    /* now allreduce so everyone agrees which files are shared and
     * which modules accessed them collectively
     */
1310
1311
    DARSHAN_MPI_CALL(PMPI_Allreduce)(mod_flags, global_mod_flags, tmp_cnt,
        MPI_UINT64_T, MPI_BAND, MPI_COMM_WORLD);
1312

1313
1314
    j = 0;
    for(i=0; i<tmp_cnt; i++)
1315
    {
1316
        if(global_mod_flags[i] != 0)
1317
        {
1318
            (*shared_recs)[j++] = id_array[i];
1319
1320
1321
1322
1323
1324
1325
1326

            /* set global_mod_flags so we know which modules collectively
             * accessed this module. we need this info to support shared
             * file reductions
             */
            HASH_FIND(hlink, core->rec_hash, &id_array[i], sizeof(darshan_record_id), ref);
            assert(ref);
            ref->global_mod_flags = global_mod_flags[i];
1327
1328
        }
    }
1329
    *shared_rec_cnt = j;
1330

1331
1332
1333
    free(id_array);
    free(mod_flags);
    free(global_mod_flags);
1334
1335
1336
    return;
}

1337
static int darshan_log_open_all(char *logfile_name, MPI_File *log_fh)
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
{
    char *hints;
    char *tok_str;