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Adjust test_fsync code to be more sane. 

Backpatch to 8.4.X.
This commit is contained in:
Bruce Momjian 2009-08-10 18:19:06 +00:00
parent f3f6737af9
commit 933b17b663
1 changed files with 29 additions and 12 deletions
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41
src/tools/fsync/test_fsync.c
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@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/src/tools/fsync/test_fsync.c,v 1.23 2009/06/11 14:49:15 momjian Exp $
* $PostgreSQL: pgsql/src/tools/fsync/test_fsync.c,v 1.24 2009/08/10 18:19:06 momjian Exp $
*
*
* test_fsync.c
@ -30,7 +30,7 @@
#define FSYNC_FILENAME "/var/tmp/test_fsync.out"
#endif
#define WRITE_SIZE (16 * 1024)
#define WRITE_SIZE (16 * 1024) /* 16k */
void die(char *str);
void print_elapse(struct timeval start_t, struct timeval elapse_t);
@ -71,6 +71,9 @@ main(int argc, char *argv[])
buf = (char *) TYPEALIGN(ALIGNOF_XLOG_BUFFER, full_buf);
/*
* Simple write
*/
printf("Simple write timing:\n");
/* write only */
gettimeofday(&start_t, NULL);
@ -87,8 +90,11 @@ main(int argc, char *argv[])
print_elapse(start_t, elapse_t);
printf("\n");
/*
* Fsync another file descriptor?
*/
printf("\nCompare fsync times on write() and non-write() descriptor:\n");
printf("(If the times are similar, fsync() can sync data written\n on a different descriptor.)\n");
printf("If the times are similar, fsync() can sync data written\non a different descriptor.\n");
/* write, fsync, close */
gettimeofday(&start_t, NULL);
@ -132,6 +138,9 @@ main(int argc, char *argv[])
print_elapse(start_t, elapse_t);
printf("\n");
/*
* Compare 1 to 2 writes
*/
printf("\nCompare one o_sync write to two:\n");
#ifdef OPEN_SYNC_FLAG
@ -148,7 +157,7 @@ main(int argc, char *argv[])
print_elapse(start_t, elapse_t);
printf("\n");
/* 2*8k o_sync writes */
/* Two 8k o_sync writes */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
@ -163,14 +172,16 @@ main(int argc, char *argv[])
close(tmpfile);
printf("\ttwo 8k o_sync writes ");
print_elapse(start_t, elapse_t);
printf("\n");
printf("\nCompare file sync methods with one 8k write:\n");
#else
printf("\t(o_sync unavailable) ");
#endif
printf("\n");
/*
* Compare file sync methods with one 8k write
*/
printf("\nCompare file sync methods with one 8k write:\n");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
@ -183,7 +194,11 @@ main(int argc, char *argv[])
close(tmpfile);
printf("\topen o_dsync, write ");
print_elapse(start_t, elapse_t);
#else
printf("\t(o_dsync unavailable) ");
#endif
printf("\n");
#ifdef OPEN_SYNC_FLAG
/* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
@ -196,9 +211,8 @@ main(int argc, char *argv[])
close(tmpfile);
printf("\topen o_sync, write ");
print_elapse(start_t, elapse_t);
#endif
#else
printf("\t(o_dsync unavailable) ");
printf("\t(o_sync unavailable) ");
#endif
printf("\n");
@ -235,11 +249,14 @@ main(int argc, char *argv[])
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
printf("\twrite, fsync ");
print_elapse(start_t, elapse_t);
printf("\n");
printf("\nCompare file sync methods with 2 8k writes:\n");
/*
* Compare file sync methods with two 8k write
*/
printf("\nCompare file sync methods with two 8k writes:\n");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
@ -318,7 +335,7 @@ main(int argc, char *argv[])
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
printf("\twrite, fsync ");
print_elapse(start_t, elapse_t);
printf("\n");