Skip to content

P
Postgres FD Implementation
Commit 9e231bab authored by Bruce Momjian's avatar Bruce Momjian
Browse files
Options

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.
parent 9ae9ad15
Hide whitespace changes
Inline Side-by-side
Showing with 109 additions and 58 deletions
src/tools/fsync/README
View file @ 9e231bab
This program tests fsync. If first times a simple read. Then, it times
an fsync that is part of a write, and one that is done on a newly opened
file. Third, it tests various fsync methods.
This program tests fsync. The tests are described as part of the program output.
The program writes to /var/tmp because /tmp is sometimes a memory file
system.
Usage: test_fsync [-f filename] [loops]
Loops defaults to 1000.
src/tools/fsync/test_fsync.c
View file @ 9e231bab
......@@ -14,6 +14,8 @@
#include <sys/time.h>
#include <unistd.h>
#define FSYNC_FILENAME "/var/tmp/test_fsync.out"
/* O_SYNC and O_FSYNC are the same */
#if defined(O_SYNC)
#define OPEN_SYNC_FLAG O_SYNC
......@@ -36,12 +38,25 @@ main(int argc, char *argv[])
struct timeval start_t;
struct timeval elapse_t;
int tmpfile,
i;
i,
loops=1000;
char *strout = (char *) malloc(65536);
char *filename = FSYNC_FILENAME;
if (argc > 2 && strcmp(argv[1],"-f") == 0)
{
filename = argv[2];
argv += 2;
argc -= 2;
}
if (argc > 1)
loops = atoi(argv[1]);
for (i = 0; i < 65536; i++)
strout[i] = 'a';
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 65536);
fsync(tmpfile); /* fsync so later fsync's don't have to do
......@@ -51,24 +66,35 @@ main(int argc, char *argv[])
printf("Simple write timing:\n");
/* write only */
gettimeofday(&start_t, NULL);
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
close(tmpfile);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
close(tmpfile);
}
gettimeofday(&elapse_t, NULL);
printf("\twrite ");
print_elapse(start_t, elapse_t);
printf("\n\n");
printf("\n");
printf("Compare fsync before and after write's close:\n");
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");
/* write, fsync, close */
gettimeofday(&start_t, NULL);
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
fsync(tmpfile);
close(tmpfile);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
fsync(tmpfile);
close(tmpfile);
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
/* do nothing but the open/close the tests are consistent. */
close(tmpfile);
}
gettimeofday(&elapse_t, NULL);
printf("\twrite, fsync, close ");
print_elapse(start_t, elapse_t);
......@@ -76,15 +102,18 @@ main(int argc, char *argv[])
/* write, close, fsync */
gettimeofday(&start_t, NULL);
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
close(tmpfile);
/* reopen file */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
fsync(tmpfile);
close(tmpfile);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
write(tmpfile, strout, 8192);
close(tmpfile);
/* reopen file */
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
fsync(tmpfile);
close(tmpfile);
}
gettimeofday(&elapse_t, NULL);
printf("\twrite, close, fsync ");
print_elapse(start_t, elapse_t);
......@@ -93,10 +122,11 @@ main(int argc, char *argv[])
printf("\nCompare one o_sync write to two:\n");
/* 16k o_sync write */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 16384);
for (i = 0; i < loops; i++)
write(tmpfile, strout, 16384);
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\tone 16k o_sync write ");
......@@ -104,11 +134,14 @@ main(int argc, char *argv[])
printf("\n");
/* 2*8k o_sync writes */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\ttwo 8k o_sync writes ");
......@@ -119,10 +152,11 @@ main(int argc, char *argv[])
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_DSYNC)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_DSYNC)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
for (i = 0; i < loops; i++)
write(tmpfile, strout, 8192);
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_dsync, write ");
......@@ -133,10 +167,11 @@ main(int argc, char *argv[])
printf("\n");
/* open_fsync, write */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
for (i = 0; i < loops; i++)
write(tmpfile, strout, 8192);
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_sync, write ");
......@@ -145,11 +180,14 @@ main(int argc, char *argv[])
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
fdatasync(tmpfile);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
fdatasync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fdatasync ");
......@@ -160,11 +198,14 @@ main(int argc, char *argv[])
printf("\n");
/* write, fsync, close */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
fsync(tmpfile);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
fsync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
......@@ -176,11 +217,14 @@ main(int argc, char *argv[])
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | O_DSYNC)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | O_DSYNC)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_dsync, write ");
......@@ -191,11 +235,14 @@ main(int argc, char *argv[])
printf("\n");
/* open_fsync, write */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR | OPEN_SYNC_FLAG)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR | OPEN_SYNC_FLAG)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_sync, write ");
......@@ -204,12 +251,15 @@ main(int argc, char *argv[])
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
fdatasync(tmpfile);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
fdatasync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fdatasync ");
......@@ -220,19 +270,22 @@ main(int argc, char *argv[])
printf("\n");
/* write, fsync, close */
if ((tmpfile = open("/var/tmp/test_fsync.out", O_RDWR)) == -1)
if ((tmpfile = open(FSYNC_FILENAME, O_RDWR)) == -1)
die("can't open /var/tmp/test_fsync.out");
gettimeofday(&start_t, NULL);
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
fsync(tmpfile);
for (i = 0; i < loops; i++)
{
write(tmpfile, strout, 8192);
write(tmpfile, strout, 8192);
fsync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
print_elapse(start_t, elapse_t);
printf("\n");
unlink("/var/tmp/test_fsync.out");
unlink(FSYNC_FILENAME);
return 0;
}
......@@ -246,7 +299,7 @@ print_elapse(struct timeval start_t, struct timeval elapse_t)
elapse_t.tv_usec += 1000000;
}
printf("%ld.%06ld", (long) (elapse_t.tv_sec - start_t.tv_sec),
printf("%3ld.%06ld", (long) (elapse_t.tv_sec - start_t.tv_sec),
(long) (elapse_t.tv_usec - start_t.tv_usec));
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment