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synced 2024-12-09 08:10:09 +08:00
Have program default to 1000 loops, and add file name and loop option.
Make open/close loop testings the same. Add descriptions for certain tests.
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9ae9ad155d
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9e231bab65
@ -1,7 +1,5 @@
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This program tests fsync. If first times a simple read. Then, it times
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an fsync that is part of a write, and one that is done on a newly opened
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file. Third, it tests various fsync methods.
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This program tests fsync. The tests are described as part of the program output.
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The program writes to /var/tmp because /tmp is sometimes a memory file
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system.
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Usage: test_fsync [-f filename] [loops]
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Loops defaults to 1000.
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@ -14,6 +14,8 @@
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#include <sys/time.h>
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#include <unistd.h>
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#define FSYNC_FILENAME "/var/tmp/test_fsync.out"
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/* O_SYNC and O_FSYNC are the same */
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#if defined(O_SYNC)
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#define OPEN_SYNC_FLAG O_SYNC
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@ -36,12 +38,25 @@ main(int argc, char *argv[])
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struct timeval start_t;
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struct timeval elapse_t;
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int tmpfile,
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i;
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i,
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loops=1000;
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char *strout = (char *) malloc(65536);
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char *filename = FSYNC_FILENAME;
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if (argc > 2 && strcmp(argv[1],"-f") == 0)
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{
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filename = argv[2];
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argv += 2;
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argc -= 2;
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}
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if (argc > 1)
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loops = atoi(argv[1]);
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for (i = 0; i < 65536; i++)
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strout[i] = 'a';
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 65536);
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fsync(tmpfile); /* fsync so later fsync's don't have to do
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@ -51,24 +66,35 @@ main(int argc, char *argv[])
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printf("Simple write timing:\n");
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/* write only */
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gettimeofday(&start_t, NULL);
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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close(tmpfile);
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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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close(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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printf("\twrite ");
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print_elapse(start_t, elapse_t);
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printf("\n\n");
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printf("\n");
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printf("Compare fsync before and after write's close:\n");
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printf("\nCompare fsync times on write() and non-write() descriptor:\n");
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printf("(If the times are similar, fsync() can sync data written\n on a different descriptor.)\n");
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/* write, fsync, close */
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gettimeofday(&start_t, NULL);
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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close(tmpfile);
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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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close(tmpfile);
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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/* do nothing but the open/close the tests are consistent. */
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close(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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printf("\twrite, fsync, close ");
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print_elapse(start_t, elapse_t);
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@ -76,15 +102,18 @@ main(int argc, char *argv[])
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/* write, close, fsync */
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gettimeofday(&start_t, NULL);
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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close(tmpfile);
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/* reopen file */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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fsync(tmpfile);
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close(tmpfile);
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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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write(tmpfile, strout, 8192);
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close(tmpfile);
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/* reopen file */
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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fsync(tmpfile);
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close(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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printf("\twrite, close, fsync ");
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print_elapse(start_t, elapse_t);
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@ -93,10 +122,11 @@ main(int argc, char *argv[])
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printf("\nCompare one o_sync write to two:\n");
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/* 16k o_sync write */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 16384);
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for (i = 0; i < loops; i++)
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write(tmpfile, strout, 16384);
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\tone 16k o_sync write ");
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@ -104,11 +134,14 @@ main(int argc, char *argv[])
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printf("\n");
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/* 2*8k o_sync writes */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\ttwo 8k o_sync writes ");
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@ -119,10 +152,11 @@ main(int argc, char *argv[])
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#ifdef OPEN_DATASYNC_FLAG
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/* open_dsync, write */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_DSYNC)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_DSYNC)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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for (i = 0; i < loops; i++)
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write(tmpfile, strout, 8192);
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\topen o_dsync, write ");
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@ -133,10 +167,11 @@ main(int argc, char *argv[])
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printf("\n");
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/* open_fsync, write */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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for (i = 0; i < loops; i++)
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write(tmpfile, strout, 8192);
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\topen o_sync, write ");
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@ -145,11 +180,14 @@ main(int argc, char *argv[])
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#ifdef HAVE_FDATASYNC
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/* write, fdatasync */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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fdatasync(tmpfile);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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fdatasync(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\twrite, fdatasync ");
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@ -160,11 +198,14 @@ main(int argc, char *argv[])
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printf("\n");
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/* write, fsync, close */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\twrite, fsync, ");
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@ -176,11 +217,14 @@ main(int argc, char *argv[])
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#ifdef OPEN_DATASYNC_FLAG
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/* open_dsync, write */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_DSYNC)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_DSYNC)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\topen o_dsync, write ");
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@ -191,11 +235,14 @@ main(int argc, char *argv[])
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printf("\n");
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/* open_fsync, write */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\topen o_sync, write ");
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@ -204,12 +251,15 @@ main(int argc, char *argv[])
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#ifdef HAVE_FDATASYNC
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/* write, fdatasync */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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fdatasync(tmpfile);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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fdatasync(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\twrite, fdatasync ");
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@ -220,19 +270,22 @@ main(int argc, char *argv[])
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printf("\n");
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/* write, fsync, close */
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if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
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if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
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die("can't open /var/tmp/test_fsync.out");
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gettimeofday(&start_t, NULL);
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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for (i = 0; i < loops; i++)
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{
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write(tmpfile, strout, 8192);
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write(tmpfile, strout, 8192);
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fsync(tmpfile);
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}
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gettimeofday(&elapse_t, NULL);
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close(tmpfile);
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printf("\twrite, fsync, ");
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print_elapse(start_t, elapse_t);
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printf("\n");
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unlink("/var/tmp/test_fsync.out");
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unlink(FSYNC_FILENAME);
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return 0;
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}
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@ -246,7 +299,7 @@ print_elapse(struct timeval start_t, struct timeval elapse_t)
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elapse_t.tv_usec += 1000000;
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}
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printf("%ld.%06ld", (long) (elapse_t.tv_sec - start_t.tv_sec),
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printf("%3ld.%06ld", (long) (elapse_t.tv_sec - start_t.tv_sec),
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(long) (elapse_t.tv_usec - start_t.tv_usec));
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}
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