-
Notifications
You must be signed in to change notification settings - Fork 6
/
fs_mark.c
1423 lines (1232 loc) · 36.3 KB
/
fs_mark.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
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
442
443
444
445
446
447
448
449
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
479
480
481
482
483
484
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
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
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
884
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
925
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
971
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
/*
* Copyright (C) 2003-2004 EMC Corporation
*
* fs_mark: Benchmark synchronous/async file creation
*
* Written by Ric Wheeler <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* gratuitous change */
/*
* Version string should be bumped on major revision changes
*/
char *fs_mark_version = "3.3";
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <ctype.h>
#include <time.h>
#include <linux/types.h>
#include <linux/limits.h>
#include <linux/unistd.h>
#include "fs_mark.h"
void cleanup_exit(void)
{
char child_log_file_name[PATH_MAX];
sprintf(child_log_file_name, "%s.%d", log_file_name, getpid());
unlink(child_log_file_name);
exit(1);
}
void usage(void)
{
fprintf(stderr,
"Usage: fs_mark\n%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s",
"\t-h <print usage and exit>\n",
"\t-k <keep files after each iteration>\n",
"\t-F <run until FS full>\n",
"\t-S Sync Method (0:No Sync, 1:fsyncBeforeClose, "
"2:sync/1_fsync, 3:PostReverseFsync, "
"4:syncPostReverseFsync, 5:PostFsync, 6:syncPostFsync)\n",
"\t[-D number (of subdirectories)]\n",
"\t[-N number (of files in each subdirectory in Round Robin mode)]\n",
"\t[-d dir1 ... -d dirN]\n", "\t[-l log_file_name]\n",
"\t[-l log_file_name]\n",
"\t[-L number (of iterations)]\n",
"\t[-n number (of files per iteration)]\n",
"\t[-p number (of total bytes file names)]\n",
"\t[-r number (of random bytes in file names)]\n",
"\t[-s byte_count (size in bytes of each file)]\n",
"\t[-t number (of total threads)]\n",
"\t[-w number (of bytes per write() syscall)]\n");
cleanup_exit();
return;
}
/*
* Run through the specified arguments and make sure that they make sense.
*/
void process_args(int argc, char **argv, char **envp)
{
int ret;
/*
* Parse all of the options that the user specified.
*/
while ((ret =
getopt(argc, argv, "vhkFr:S:N:D:d:l:L:n:p:s:t:w:")) != EOF) {
switch (ret) {
case 'v': /* verbose stats */
verbose_stats = 1;
break;
case 'D': /* Use Multiple directories */
num_subdirs = atoi(optarg);
if (num_subdirs < 2) {
fprintf(stderr,
"Number of subdirs needs to be greater than 1\n");
usage();
}
/*
* Change the policy to a good multi-subdir one
*/
if (dir_policy == DIR_NO_SUBDIRS)
dir_policy = DIR_TIME_HASH;
break;
case 'd': /* Set directory path */
if (num_dirs > MAX_THREADS) {
fprintf(stderr,
"Max number of threads (and directories) is %d\n",
MAX_THREADS);
usage();
}
if (strlen(optarg) >= MAX_NAME_PATH) {
fprintf(stderr,
"fs_mark: %s directory pathname too long (must be less than %d bytes)\n",
optarg, MAX_NAME_PATH);
usage();
}
strncpy(child_tasks[num_dirs].test_dir, optarg,
PATH_MAX);
num_dirs++;
break;
case 'F': /* Run until FS is full */
keep_files = 1; /* Set keep files as well (hard to fill fs without this!) */
do_fill_fs = 1;
break;
case 'k': /* Leave test files at end */
keep_files = 1;
break;
case 'l': /* Log file name */
strncpy(log_file_name, optarg, PATH_MAX);
break;
case 'L': /* number of iterations */
loop_count = atoi(optarg);
keep_files = 1; /* Set keep files as well */
break;
case 'n': /* Set number of files to test of each size */
num_files = atoi(optarg);
if (num_files > MAX_FILES) {
fprintf(stderr, "Max files is %d\n", MAX_FILES);
usage();
}
break;
case 'N': /* Set number of files to write into each subdirectory */
dir_policy = DIR_ROUND_ROBIN;
num_per_subdir = atoi(optarg);
break;
case 'p': /* Set size of names in directories */
name_len = atoi(optarg);
if (name_len > FILENAME_SIZE) {
fprintf(stderr, "Max filename size is %d\n",
FILENAME_SIZE);
usage();
}
break;
case 's': /* Set specific size to test */
file_size = atoi(optarg);
break;
case 'r': /* Use random file names */
rand_len = atoi(optarg);
break;
case 'S': /* Turn off sync and fsync */
sync_method_type = atoi(optarg);
switch (sync_method_type) {
case 0:
sync_method = 0;
break;
case 1:
sync_method = SYNC_TEST_PER_FILE;
break;
case 2:
sync_method = SYNC_TEST_PER_THREAD;
break;
case 3:
sync_method = SYNC_TEST_REVERSE;
break;
case 4:
sync_method = SYNC_TEST_REVERSE_SYNC;
break;
case 5:
sync_method = SYNC_TEST_POST;
break;
case 6:
sync_method = SYNC_TEST_POST_SYNC;
break;
default:
fprintf(stderr, "Max filename size is %d\n",
FILENAME_SIZE);
usage();
}
break;
case 't': /* Set number of threads */
num_threads = atoi(optarg);
if (num_threads > MAX_THREADS) {
fprintf(stderr, "Max threads is %d\n",
MAX_THREADS);
usage();
}
break;
case 'w': /* Set write buffer size */
io_buffer_size = atoi(optarg);
if (io_buffer_size > MAX_IO_BUFFER_SIZE) {
fprintf(stderr, "MAX IO buffer size is %d\n",
MAX_IO_BUFFER_SIZE);
usage();
}
break;
case 'h': /* Print usage and exit */
usage();
break;
default:
usage();
}
}
if (num_dirs == 0) {
fprintf(stderr,
"Must specify at least one directory with -d switch\n");
usage();
}
if ((num_subdirs == 0) && (num_per_subdir > 0)) {
fprintf(stderr,
"Must specify at more than 1 subdirectory with -D switch"
" for -N num_per_subdir to make sense\n");
usage();
}
/*
* We need at least one thread per specified directory.
* Also, if we specify more threads than directories, divide
* up the threads & make sure that an even number of threads runs
* in each one.
*/
if (num_dirs > num_threads)
num_threads = num_dirs;
else {
int threads_per_dir, i, j;
threads_per_dir = num_threads / num_dirs;
if (((num_dirs * threads_per_dir) != num_threads) ||
((num_dirs * threads_per_dir) > MAX_THREADS)) {
fprintf(stderr,
"Threads (%d) must be an even multiple the number of directories"
" (%d) and less than %d \n",
num_threads, num_dirs, MAX_THREADS);
usage();
}
for (i = 0; i < num_dirs; i++)
for (j = 1; j < threads_per_dir; j++) {
strncpy(child_tasks[i + (j * num_dirs)].
test_dir, child_tasks[i].test_dir,
PATH_MAX);
}
}
return;
}
/*
* Extract & return the file name from the child_tasks array
*/
char *find_dir_name(int pid)
{
int num_dir;
for (num_dir = 0; num_dir < MAX_THREADS; num_dir++) {
if (child_tasks[num_dir].child_pid == pid)
break;
}
return (child_tasks[num_dir].test_dir);
}
/*
* Setup a file name.
*/
void setup_file_name(int file_index, pid_t my_pid)
{
int seq_len;
int j, pad, skip;
unsigned long sec_time;
char *my_dir;
my_dir = find_dir_name(my_pid);
char subdir_name[MAX_NAME_PATH];
struct timeval now;
/*
* Get the current time.
*/
(void) gettimeofday(&now, (struct timezone *) 0);
sec_time = now.tv_sec;
/*
* If this is the first run, record this time in
* start_sec_time.
*/
if (start_sec_time == 0) {
start_sec_time = sec_time;
}
/*
* Each filename will be name_len characters long.
* If random characters are requested, they go at the end of the filename.
* By default, all names are only sequential.
*/
seq_len = name_len - rand_len;
if (names == NULL) {
if ((names =
calloc(sizeof(struct name_entry), num_files)) == NULL) {
fprintf(stderr,
"fs_mark: failed to allocate memory for file names: %s\n",
strerror(errno));
cleanup_exit();
}
}
/*
* Now pick a directory to stick this file in.
*
*/
switch (dir_policy) {
case DIR_NO_SUBDIRS:
subdir_name[0] = 0;
break;
case DIR_ROUND_ROBIN:
if (num_per_subdir) {
/*
* Stick the specified number of files in each directory before
* moving on.
*/
if (files_in_subdir >= num_per_subdir) {
current_subdir++;
files_in_subdir = 0;
}
current_subdir = current_subdir % num_subdirs;
files_in_subdir++;
}
sprintf(subdir_name, "%02x", current_subdir);
break;
case DIR_TIME_HASH:
if ((sec_time - start_sec_time) > secs_per_directory) {
current_subdir = (current_subdir + 1) % num_subdirs;
start_sec_time = sec_time;
}
sprintf(subdir_name, "%02x", current_subdir);
break;
default:
fprintf(stderr, "fs_mark: invalid directory policy\n");
exit(1);
break;
}
sprintf(names[file_index].target_dir, "%s/%s", my_dir, subdir_name);
/*
* Make the base directory entry (i.e., /mnt/1/test/00)
*/
if ((mkdir(names[file_index].target_dir, 0777) != 0)
&& (errno != EEXIST)) {
fprintf(stderr, "fs_mark: mkdir %s failed: %s\n",
names[file_index].target_dir, strerror(errno));
cleanup_exit();
}
sprintf(names[file_index].write_dir, "%s", names[file_index].target_dir);
/*
* Set up the sequential name for this file
*/
sprintf(seq_name, "%lx", sec_time);
/*
* Compute a random name for the file
*/
for (j = 0; j < rand_len; j++) {
/*
* Pick a random name, making sure that it is either a letter or digit
*/
do {
long int val;
val = random();
rand_name[j] = '0' + (val & 0x7f);
} while (!(isupper(rand_name[j]) || isdigit(rand_name[j])));
}
rand_name[rand_len] = 0; /* Terminate string with NULL */
/*
* We want to create names with the specified number of sequential & random bytes.
* Make sure to take the least signficant bytes of sequential (the most signficant
* do not change)
*/
skip = strlen(seq_name) - seq_len;
if (skip > 0) { /* More sequential bytes than we need */
strncat(names[file_index].f_name, &seq_name[skip], seq_len);
} else {
strncat(names[file_index].f_name, seq_name, seq_len);
}
pad = seq_len - strlen(seq_name);
for (j = 0; j < pad; j++)
strcat(names[file_index].f_name, "~");
strncat(names[file_index].f_name, rand_name, rand_len);
return;
}
/*
* Setup and initial state
*/
void setup(pid_t pid)
{
char thread_log_file_name[PATH_MAX];
char *my_dir;
struct timeval now;
/*
* Initialize the random functions for this program.
*/
(void)gettimeofday(&now, (struct timezone *)0);
srandom((long)now.tv_usec);
if (num_subdirs > 0) {
/*
* Pick a starting directory to write into.
* To avoid having short runs always write into the first
* few directories, pick a starting directory based on the time value.
*/
current_subdir = now.tv_sec % num_subdirs;
}
/*
* Open the log file in append mode to preserve previous runs data
*/
sprintf(thread_log_file_name, "%s.%d", log_file_name, pid);
if ((child_log_file_fp = fopen(thread_log_file_name, "w")) == NULL) {
fprintf(stderr,
"fs_mark: setup failed to fopen log file: %s %s\n",
thread_log_file_name, strerror(errno));
cleanup_exit();
}
/*
* Clear the io_buffer
*/
memset(io_buffer, 0, io_buffer_size);
/*
* Create my high level test directory
*/
my_dir = find_dir_name(pid);
if ((mkdir(my_dir, 0777) != 0) && (errno != EEXIST)) {
fprintf(stderr,
"fill_dir:mkdir %s failed: %s\n", my_dir,
strerror(errno));
cleanup_exit();
}
return;
}
/*
* Return an integer to represent the %full (similar hopefully to what df returns!)
*/
int get_df_full(char *dir_name)
{
struct statfs fs_buf;
float df_used, used_blocks;
int df_percent_used;
if (statfs(dir_name, &fs_buf) == -1) {
fprintf(stderr, "fs_mark: statfs failed on %s %s\n", dir_name,
strerror(errno));
cleanup_exit();
}
used_blocks = (float)(fs_buf.f_blocks - fs_buf.f_bavail);
df_used = (used_blocks / fs_buf.f_blocks);
df_percent_used = (int)(100 * df_used);
return (df_percent_used);
}
/*
* Return an unsigned long long with number of bytes left in file system.
*/
unsigned long long get_bytes_free(char *dir_name)
{
struct statfs fs_buf;
unsigned long long bytes_free;
if (statfs(dir_name, &fs_buf) == -1) {
fprintf(stderr, "fs_mark: statfs failed on %s %s\n", dir_name,
strerror(errno));
cleanup_exit();
}
bytes_free = (unsigned long long)fs_buf.f_bavail;
bytes_free = bytes_free * fs_buf.f_bsize;
return (bytes_free);
}
/*
* This routine opens, writes the amount of (zero filled) data to a file.
* It chunks IO requests into the specified buffer size. The data is just zeroed,
* nothing in the kernel inspects the contents of the buffer on its way to disk.
*/
void write_file(int fd,
int sz,
unsigned long long *avg_write_usec,
unsigned long long *total_write_usec,
unsigned long long *min_write_usec,
unsigned long long *max_write_usec)
{
int ret = 0;
int sz_left;
int write_size, write_calls;
unsigned long long local_write_usec, delta;
write_calls = 0;
write_size = io_buffer_size;
sz_left = sz;
local_write_usec = 0ULL;
do {
if (write_size > sz_left)
write_size = sz_left;
start(0);
if ((ret = write(fd, io_buffer, write_size)) != write_size) {
fprintf(stderr,
"fs_mark: write_file write failed: %d %s\n",
ret, strerror(errno));
cleanup_exit();
}
delta = stop(0, 0);
local_write_usec += delta;
if (delta > *max_write_usec)
*max_write_usec = delta;
if ((*min_write_usec == 0) || (delta < *min_write_usec))
*min_write_usec = delta;
sz_left -= ret;
write_calls++;
} while (sz_left > 0);
*avg_write_usec += (local_write_usec / write_calls);
*total_write_usec += local_write_usec;
return;
}
/*
* Verify that there is enough space for this run.
*/
static void check_space(pid_t my_pid)
{
char *my_dir_name;
unsigned long long bytes_per_loop;
my_dir_name = find_dir_name(my_pid);
/*
* No use in running this if the file system is already full.
* Compute free bytes and compare to many bytes needed for this iteration.
*/
bytes_per_loop = (unsigned long long)file_size *num_files;
if (get_bytes_free(my_dir_name) < bytes_per_loop) {
fprintf(stdout,
"Insufficient free space in %s to create %d new files, exiting\n",
my_dir_name, num_files);
do_fill_fs = 0; /* Setting this signals the main loop to exit */
cleanup_exit();
}
return;
}
/*
* Main loop in program - creates, writes and removes "num_files" files of each size.
* Each of the subcomponents is measured separately so we can track how specific aspects
* degrade.
*/
static struct timeval loop_start_tv, loop_stop_tv;
void do_run(pid_t my_pid)
{
int file_index, fd;
float files_per_sec;
unsigned long long total_file_ops, delta, loop_usecs;
unsigned long long creat_usec, max_creat_usec, min_creat_usec;
unsigned long long avg_write_usec, max_write_usec, min_write_usec,
total_write_usec;
unsigned long long fsync_usec, max_fsync_usec, min_fsync_usec;
unsigned long long close_usec, max_close_usec, min_close_usec;
unsigned long long unlink_usec, max_unlink_usec, min_unlink_usec;
unsigned long long avg_sync_usec, app_overhead_usec;
char file_write_name[MAX_NAME_PATH + FILENAME_SIZE];
char file_target_name[MAX_NAME_PATH + FILENAME_SIZE];
/*
* Verify that there is enough space for this run.
*/
check_space(my_pid);
/*
* This loop uses microsecond timers to measure each individual file operation.
* Once all files of a given size have been processed, the sum of the times are
* recorded in operations/sec.
*/
files_per_sec = 0.0;
creat_usec = max_creat_usec = min_creat_usec = 0ULL;
avg_write_usec = max_write_usec = min_write_usec = total_write_usec = 0ULL;
fsync_usec = max_fsync_usec = min_fsync_usec = avg_sync_usec = 0ULL;
close_usec = max_close_usec = min_close_usec = 0ULL;
unlink_usec = max_unlink_usec = min_unlink_usec = 0ULL;
/*
* MAIN FILE WRITE LOOP:
* This loop measures the specific steps in creating files:
* Step 1: Make up a file name
* Step 2: Creat(file_name);
* Step 3: write file data
* Step 4: fsync() file data (optional)
* Step 5: close() file descriptor
*/
start(&loop_start_tv);
for (file_index = 0; file_index < num_files; ++file_index) {
/*
* To better mimic a running system, create the file names here during the run.
* This lets us stick in the time of day and vary the distribution in interesting
* ways across the directories.
* Note: the file name is a full path, so it specifies both the directory and
* filename with the directory.
*/
setup_file_name(file_index, my_pid);
/*
* Time the creation of the file.
*/
sprintf(file_write_name, "%s/%s", names[file_index].write_dir,
names[file_index].f_name);
sprintf(file_target_name, "%s/%s", names[file_index].target_dir,
names[file_index].f_name);
start(0);
if ((fd =
open(file_write_name, O_CREAT | O_RDWR | O_TRUNC,
0666)) == -1) {
fprintf(stderr, "Error in creat: %s\n",
strerror(errno));
cleanup_exit();
}
delta = stop(0, 0);
creat_usec += delta;
if (delta > max_creat_usec)
max_creat_usec = delta;
if ((min_creat_usec == 0) || (delta < min_creat_usec))
min_creat_usec = delta;
/*
* Time writing data into the file.
* The timing needs to be done inside the subroutine since
* one file requires many writes.
* In avg_write_usec, we acculumate the average of the average write times.
* In total_write_usec, we track the total time spent in write().
*/
write_file(fd, file_size, &avg_write_usec, &total_write_usec,
&min_write_usec, &max_write_usec);
/*
* Time the fsync() operation.
* With the write barrier patch in the kernel,
* this actually flushed the IDE write cache as well.
*/
if (sync_method & FSYNC_BEFORE_CLOSE) {
start(0);
if (fsync(fd) == -1) {
fprintf(stderr, "fs_mark: fsync failed %s\n",
strerror(errno));
cleanup_exit();
}
delta = stop(0, 0);
fsync_usec += delta;
if (delta > max_fsync_usec)
max_fsync_usec = delta;
if ((min_fsync_usec == 0) || (delta < min_fsync_usec))
min_fsync_usec = delta;
}
/*
* Time the file close
*/
start(0);
close(fd);
delta = stop(0, 0);
close_usec += delta;
if (delta > max_close_usec)
max_close_usec = delta;
if ((min_close_usec == 0) || (delta < min_close_usec))
min_close_usec = delta;
}
if (sync_method & FSYNC_SYNC_SYSCALL) {
start(0);
sync();
delta = stop(0, 0);
/*
* Add the time spent in sync() to the total cost of fsync()
*/
avg_sync_usec = delta;
}
/*
* Post writing, in order fsync method.
* Note that we count three system calls into the time spent in fsync() here -
* the open/fsync and close.
*/
if (sync_method & FSYNC_POST_IN_ORDER) {
for (file_index = 0; file_index < num_files; ++file_index) {
int fd;
sprintf(file_target_name, "%s/%s",
names[file_index].target_dir,
names[file_index].f_name);
start(0);
if ((fd = open(file_target_name, O_RDONLY, 0666)) == -1) {
fprintf(stderr, "Error in open of %s : %s\n",
file_target_name, strerror(errno));
cleanup_exit();
}
if (fsync(fd) == -1) {
fprintf(stderr, "fs_mark: fsync failed %s\n",
strerror(errno));
cleanup_exit();
}
close(fd);
delta = stop(0, 0);
fsync_usec += delta;
if (delta > max_fsync_usec)
max_fsync_usec = delta;
if ((min_fsync_usec == 0) || (delta < min_fsync_usec))
min_fsync_usec = delta;
}
}
/*
* Post writing, reverse order fsync method.
* Note that we count three system calls into the time spent in fsync() here -
* the open/fsync and close.
*/
if (sync_method & FSYNC_POST_REVERSE) {
for (file_index = (num_files - 1); file_index >= 0;
--file_index) {
int fd;
sprintf(file_target_name, "%s/%s",
names[file_index].target_dir,
names[file_index].f_name);
start(0);
if ((fd = open(file_target_name, O_RDONLY, 0666)) == -1) {
fprintf(stderr, "Error in open of %s : %s\n",
file_target_name, strerror(errno));
cleanup_exit();
}
if (fsync(fd) == -1) {
fprintf(stderr, "fs_mark: fsync failed %s\n",
strerror(errno));
cleanup_exit();
}
close(fd);
delta = stop(0, 0);
fsync_usec += delta;
if (delta > max_fsync_usec)
max_fsync_usec = delta;
if ((min_fsync_usec == 0) || (delta < min_fsync_usec))
min_fsync_usec = delta;
}
}
/*
* Post writing, one per directory fsync method.
* Note that we count three system calls into the time spent in fsync() here -
* the open/fsync and close.
*/
if (sync_method & FSYNC_FIRST_FILE) {
int fd;
sprintf(file_target_name, "%s/%s", names[0].target_dir,
names[0].f_name);
start(0);
if ((fd = open(file_target_name, O_RDONLY, 0666)) == -1) {
fprintf(stderr, "Error in open of %s : %s\n",
file_target_name, strerror(errno));
cleanup_exit();
}
if (fsync(fd) == -1) {
fprintf(stderr, "fs_mark: fsync failed %s\n",
strerror(errno));
cleanup_exit();
}
close(fd);
fsync_usec += stop(0, 0);
}
/*
* Record the total time spent in the file writing loop - we ignore the time spent unlinking files
*/
loop_usecs = stop(&loop_start_tv, &loop_stop_tv);
/*
* Time unlink of the file if files need removing for this run.
*/
if (!keep_files) {
for (file_index = 0; file_index < num_files; ++file_index) {
sprintf(file_target_name, "%s/%s",
names[file_index].target_dir,
names[file_index].f_name);
start(0);
if (unlink(file_target_name) == -1) {
fprintf(stderr, "Error in unlink of %s : %s\n",
file_target_name, strerror(errno));
cleanup_exit();
}
delta = stop(0, 0);
unlink_usec += delta;
if (delta > max_unlink_usec)
max_unlink_usec = delta;
if ((min_unlink_usec == 0) || (delta < min_unlink_usec))
min_unlink_usec = delta;
}
}
/*
* Combine the file write operations into one metric
*/
total_file_ops =
creat_usec + total_write_usec + fsync_usec + avg_sync_usec +
close_usec;
app_overhead_usec = loop_usecs - total_file_ops;
/*
* Keep track of how many total files we have written since the program
* started
*/
file_count += num_files;
/*
* Now compute the rate that we wrote files in files/sec.
*/
files_per_sec = num_files / (loop_usecs / 1000000.0);
/*
* Write to the log file.
*/
fprintf(child_log_file_fp,
"%u %.1f %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
file_count,
files_per_sec,
app_overhead_usec,
min_creat_usec,
creat_usec / num_files,
max_creat_usec,
min_write_usec,
avg_write_usec / num_files,
max_write_usec,
min_fsync_usec,
fsync_usec / num_files,
max_fsync_usec,
avg_sync_usec,
min_close_usec,
close_usec / num_files,
max_close_usec,
min_unlink_usec, unlink_usec / num_files, max_unlink_usec);
fflush(child_log_file_fp);
return;
}
void process_child_log_file(pid_t child_pid, fs_mark_stat_t * thread_stats)
{
char child_log_file_name[PATH_MAX];
FILE *thread_log_fp;
int res;
/*
* Compute and open the child thread log file
*/
sprintf(child_log_file_name, "%s.%d", log_file_name, child_pid);
if ((thread_log_fp = fopen(child_log_file_name, "r")) == NULL) {
fprintf(stderr, "fopen failed to open: %s\n",
child_log_file_name);
cleanup_exit();
}
if ((res = fscanf(thread_log_fp,
"%u %f %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
&thread_stats->file_count,
&thread_stats->files_per_sec,
&thread_stats->app_overhead_usec,
&thread_stats->min_creat_usec,
&thread_stats->avg_creat_usec,
&thread_stats->max_creat_usec,
&thread_stats->min_write_usec,
&thread_stats->avg_write_usec,
&thread_stats->max_write_usec,
&thread_stats->min_fsync_usec,
&thread_stats->avg_fsync_usec,
&thread_stats->max_fsync_usec,
&thread_stats->avg_sync_usec,
&thread_stats->min_close_usec,
&thread_stats->avg_close_usec,
&thread_stats->max_close_usec,
&thread_stats->min_unlink_usec,
&thread_stats->avg_unlink_usec,
&thread_stats->max_unlink_usec)) != 19) {
fprintf(stderr,
"fscanf read too few entries from thread log file: %s\n",
child_log_file_name);
cleanup_exit();
}
/*
* Close & remove the thread log file
*/
fclose(thread_log_fp);
unlink(child_log_file_name);
return;
}
/*
* Add the thread_stats information into the global iteration statistics
*/
void aggregate_thread_stats(fs_mark_stat_t * thread_stats,
fs_mark_stat_t * iteration_stats)
{
int i;
for (i = 0; i < num_threads; i++) {