static void
test_non_sync(void)
{
int tmpfile,
ops;
/*
* Test a simple write without fsync
*/
printf("\nNon-Sync'ed %dkB writes:\n", XLOG_BLCKSZ_K);
printf(LABEL_FORMAT, "write");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
}
/*
* Test open_sync with different size files
*/
static void
test_open_sync(const char *msg, int writes_size)
{
#ifdef OPEN_SYNC_FLAG
int tmpfile,
ops,
writes;
#endif
printf(LABEL_FORMAT, msg);
fflush(stdout);
#ifdef OPEN_SYNC_FLAG
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG | PG_O_DIRECT, 0)) == -1)
printf(NA_FORMAT, "n/a*\n");
else
{
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < 16 / writes_size; writes++)
if (write(tmpfile, buf, writes_size * 1024) !=
writes_size * 1024)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
}
#else
printf(NA_FORMAT, "n/a\n");
#endif
}
int
main(int argc, char *argv[])
{
struct timeval start_t;
struct timeval elapse_t;
int tmpfile,
i,
loops = 1000;
char *full_buf = (char *) malloc(XLOG_SEG_SIZE),
*buf;
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 < XLOG_SEG_SIZE; i++)
full_buf[i] = 'a';
if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, full_buf, XLOG_SEG_SIZE) != XLOG_SEG_SIZE)
die("write failed");
/* fsync so later fsync's don't have to do it */
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
buf = (char *) TYPEALIGN(ALIGNOF_XLOG_BUFFER, full_buf);
printf("Simple write timing:\n");
/* write only */
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
close(tmpfile);
}
gettimeofday(&elapse_t, NULL);
printf("\twrite ");
print_elapse(start_t, elapse_t);
printf("\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);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
/* 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);
printf("\n");
/* write, close, fsync */
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
close(tmpfile);
/* reopen file */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
}
gettimeofday(&elapse_t, NULL);
printf("\twrite, close, fsync ");
print_elapse(start_t, elapse_t);
printf("\n");
printf("\nCompare one o_sync write to two:\n");
#ifdef OPEN_SYNC_FLAG
/* 16k o_sync write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\tone 16k o_sync write ");
print_elapse(start_t, elapse_t);
printf("\n");
/* 2*8k o_sync writes */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
}
gettimeofday(&elapse_t, NULL);
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");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_dsync, write ");
print_elapse(start_t, elapse_t);
printf("\n");
#ifdef OPEN_SYNC_FLAG
/* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_sync, write ");
print_elapse(start_t, elapse_t);
#endif
#else
printf("\t(o_dsync unavailable) ");
#endif
printf("\n");
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
fdatasync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fdatasync ");
print_elapse(start_t, elapse_t);
#else
printf("\t(fdatasync unavailable)");
#endif
printf("\n");
/* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
print_elapse(start_t, elapse_t);
printf("\n");
printf("\nCompare file sync methods with 2 8k writes:\n");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
}
gettimeofday(&elapse_t, NULL);
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)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\topen o_sync, write ");
print_elapse(start_t, elapse_t);
printf("\n");
#endif
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
fdatasync(tmpfile);
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fdatasync ");
print_elapse(start_t, elapse_t);
#else
printf("\t(fdatasync unavailable)");
#endif
printf("\n");
/* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE / 2) != WRITE_SIZE / 2)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
}
gettimeofday(&elapse_t, NULL);
close(tmpfile);
printf("\twrite, fsync, ");
print_elapse(start_t, elapse_t);
printf("\n");
free(full_buf);
unlink(filename);
return 0;
}
int
main(int argc, char *argv[])
{
struct timeval start_t;
struct timeval stop_t;
int tmpfile,
i;
char *full_buf = (char *) malloc(XLOG_SEG_SIZE),
*buf;
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 < XLOG_SEG_SIZE; i++)
full_buf[i] = random();
if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, full_buf, XLOG_SEG_SIZE) != XLOG_SEG_SIZE)
die("write failed");
/* fsync now so later fsync's don't have to do it */
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
buf = (char *) TYPEALIGN(ALIGNOF_XLOG_BUFFER, full_buf);
printf("Loops = %d\n\n", loops);
/*
* Simple write
*/
printf("Simple write:\n");
printf(LABEL_FORMAT, "8k write");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
/*
* Compare file sync methods with one 8k write
*/
printf("\nCompare file sync methods using one write:\n");
#ifdef OPEN_DATASYNC_FLAG
printf(LABEL_FORMAT, "open_datasync 8k write");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: open_datasync)\n");
#endif
#ifdef OPEN_SYNC_FLAG
printf(LABEL_FORMAT, "open_sync 8k write");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: open_sync)\n");
#endif
#ifdef HAVE_FDATASYNC
printf(LABEL_FORMAT, "8k write, fdatasync");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
fdatasync(tmpfile);
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: fdatasync)\n");
#endif
printf(LABEL_FORMAT, "8k write, fsync");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
/*
* Compare file sync methods with two 8k write
*/
printf("\nCompare file sync methods using two writes:\n");
#ifdef OPEN_DATASYNC_FLAG
printf(LABEL_FORMAT, "2 open_datasync 8k writes");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: open_datasync)\n");
#endif
#ifdef OPEN_SYNC_FLAG
printf(LABEL_FORMAT, "2 open_sync 8k writes");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#endif
#ifdef HAVE_FDATASYNC
printf(LABEL_FORMAT, "8k write, 8k write, fdatasync");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
fdatasync(tmpfile);
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: fdatasync)\n");
#endif
printf(LABEL_FORMAT, "8k write, 8k write, fsync");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
/*
* Compare 1 to 2 writes
*/
printf("\nCompare open_sync with different sizes:\n");
#ifdef OPEN_SYNC_FLAG
printf(LABEL_FORMAT, "open_sync 16k write");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE * 2) != WRITE_SIZE * 2)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
printf(LABEL_FORMAT, "2 open_sync 8k writes");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf("\t(unavailable: open_sync)\n");
#endif
/*
* Fsync another file descriptor?
*/
printf("\nTest if fsync on non-write file descriptor is honored:\n");
printf("(If the times are similar, fsync() can sync data written\n");
printf("on a different descriptor.)\n");
printf(LABEL_FORMAT, "8k write, fsync, close");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
/* do nothing but the open/close the tests are consistent. */
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
printf(LABEL_FORMAT, "8k write, close, fsync");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
close(tmpfile);
/* reopen file */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
/* cleanup */
free(full_buf);
unlink(filename);
return 0;
}
int
main(int argc, char *argv[])
{
struct timeval start_t;
struct timeval stop_t;
int tmpfile,
i,
loops = 5000;
char *full_buf = (char *) malloc(XLOG_SEG_SIZE),
*buf;
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 < XLOG_SEG_SIZE; i++)
full_buf[i] = random();
if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, full_buf, XLOG_SEG_SIZE) != XLOG_SEG_SIZE)
die("write failed");
/* fsync now so later fsync's don't have to do it */
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
// Page align the buffer
//~ buf = (char *) TYPEALIGN(ALIGNOF_XLOG_BUFFER, full_buf);
buf = full_buf;
if (((intptr_t) full_buf & (PAGE_ALIGNMENT-1)) != 0) {
buf = (void*) ((intptr_t) full_buf & ~(PAGE_ALIGNMENT-1)) + PAGE_ALIGNMENT;
}
printf("%p %p\n", full_buf, buf);
assert(((intptr_t) buf & (PAGE_ALIGNMENT-1)) == 0);
assert(XLOG_SEG_SIZE > WRITE_SIZE);
/*
* Simple write
*/
printf("Simple 8k write timing:\n");
/* write only */
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
printf(LABEL_FORMAT, "write");
print_elapse(start_t, stop_t);
/*
* Compare file sync methods with one 8k write
*/
printf("\nCompare file sync methods using one 8k write:\n");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "open_datasync write");
print_elapse(start_t, stop_t);
#else
printf("\t(open_datasync unavailable)\n");
#endif
#ifdef OPEN_SYNC_FLAG
/* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "open_sync write");
print_elapse(start_t, stop_t);
#else
printf("\t(open_sync unavailable)\n");
#endif
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
fdatasync(tmpfile);
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "write, fdatasync");
print_elapse(start_t, stop_t);
#else
printf("\t(fdatasync unavailable)\n");
#endif
/* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "write, fsync");
print_elapse(start_t, stop_t);
/*
* Compare file sync methods with two 8k write
*/
printf("\nCompare file sync methods using two 8k writes:\n");
#ifdef OPEN_DATASYNC_FLAG
/* open_dsync, write */
if ((tmpfile = open(filename, O_RDWR | O_DSYNC, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "open_datasync write, write");
print_elapse(start_t, stop_t);
#else
printf("\t(open_datasync unavailable)\n");
#endif
#ifdef OPEN_SYNC_FLAG
/* open_fsync, write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "open_sync write, write");
print_elapse(start_t, stop_t);
#endif
#ifdef HAVE_FDATASYNC
/* write, fdatasync */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
fdatasync(tmpfile);
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "write, write, fdatasync");
print_elapse(start_t, stop_t);
#else
printf("\t(fdatasync unavailable)\n");
#endif
/* write, fsync, close */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "write, write, fsync");
print_elapse(start_t, stop_t);
/*
* Compare 1 to 2 writes
*/
printf("\nCompare open_sync sizes:\n");
#ifdef OPEN_SYNC_FLAG
/* 16k open_sync write */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE * 2) != WRITE_SIZE * 2)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "16k open_sync write");
print_elapse(start_t, stop_t);
/* Two 8k open_sync writes */
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG, 0)) == -1)
die("Cannot open output file.");
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
printf(LABEL_FORMAT, "2 8k open_sync writes");
print_elapse(start_t, stop_t);
#else
printf("\t(open_sync unavailable)\n");
#endif
/*
* Fsync another file descriptor?
*/
printf("\nCompare fsync times on write() and new file descriptors (if the times\n");
printf("are similar, fsync() can sync data written on a different descriptor):\n");
/* write, fsync, close */
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
/* do nothing but the open/close the tests are consistent. */
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
printf(LABEL_FORMAT, "write, fsync, close");
print_elapse(start_t, stop_t);
/* write, close, fsync */
gettimeofday(&start_t, NULL);
for (i = 0; i < loops; i++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
die("write failed");
close(tmpfile);
/* reopen file */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("Cannot open output file.");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
printf(LABEL_FORMAT, "write, close, fsync");
print_elapse(start_t, stop_t);
/* cleanup */
free(full_buf);
unlink(filename);
return 0;
}
static void
test_file_descriptor_sync(void)
{
int tmpfile,
ops;
/*
* Test whether fsync can sync data written on a different descriptor for
* the same file. This checks the efficiency of multi-process fsyncs
* against the same file. Possibly this should be done with writethrough
* on platforms which support it.
*/
printf("\nTest if fsync on non-write file descriptor is honored:\n");
printf("(If the times are similar, fsync() can sync data written\n");
printf("on a different descriptor.)\n");
/*
* first write, fsync and close, which is the normal behavior without
* multiple descriptors
*/
printf(LABEL_FORMAT, "write, fsync, close");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
/*
* open and close the file again to be consistent with the following
* test
*/
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
/*
* Now open, write, close, open again and fsync This simulates processes
* fsyncing each other's writes.
*/
printf(LABEL_FORMAT, "write, close, fsync");
fflush(stdout);
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
close(tmpfile);
/* reopen file */
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
if (fsync(tmpfile) != 0)
die("fsync failed");
close(tmpfile);
}
gettimeofday(&stop_t, NULL);
print_elapse(start_t, stop_t);
}
static void
test_sync(int writes_per_op)
{
int tmpfile,
ops,
writes;
bool fs_warning = false;
if (writes_per_op == 1)
printf("\nCompare file sync methods using one %dkB write:\n", XLOG_BLCKSZ_K);
else
printf("\nCompare file sync methods using two %dkB writes:\n", XLOG_BLCKSZ_K);
printf("(in wal_sync_method preference order, except fdatasync\n");
printf("is Linux's default)\n");
/*
* Test open_datasync if available
*/
printf(LABEL_FORMAT, "open_datasync");
fflush(stdout);
#ifdef OPEN_DATASYNC_FLAG
if ((tmpfile = open(filename, O_RDWR | O_DSYNC | PG_O_DIRECT, 0)) == -1)
{
printf(NA_FORMAT, "n/a*\n");
fs_warning = true;
}
else
{
if ((tmpfile = open(filename, O_RDWR | O_DSYNC | PG_O_DIRECT, 0)) == -1)
die("could not open output file");
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < writes_per_op; writes++)
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
}
#else
printf(NA_FORMAT, "n/a\n");
#endif
/*
* Test fdatasync if available
*/
printf(LABEL_FORMAT, "fdatasync");
fflush(stdout);
#ifdef HAVE_FDATASYNC
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < writes_per_op; writes++)
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
fdatasync(tmpfile);
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf(NA_FORMAT, "n/a\n");
#endif
/*
* Test fsync
*/
printf(LABEL_FORMAT, "fsync");
fflush(stdout);
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < writes_per_op; writes++)
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
if (fsync(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
/*
* If fsync_writethrough is available, test as well
*/
printf(LABEL_FORMAT, "fsync_writethrough");
fflush(stdout);
#ifdef HAVE_FSYNC_WRITETHROUGH
if ((tmpfile = open(filename, O_RDWR, 0)) == -1)
die("could not open output file");
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < writes_per_op; writes++)
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
if (pg_fsync_writethrough(tmpfile) != 0)
die("fsync failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
#else
printf(NA_FORMAT, "n/a\n");
#endif
/*
* Test open_sync if available
*/
printf(LABEL_FORMAT, "open_sync");
fflush(stdout);
#ifdef OPEN_SYNC_FLAG
if ((tmpfile = open(filename, O_RDWR | OPEN_SYNC_FLAG | PG_O_DIRECT, 0)) == -1)
{
printf(NA_FORMAT, "n/a*\n");
fs_warning = true;
}
else
{
gettimeofday(&start_t, NULL);
for (ops = 0; ops < ops_per_test; ops++)
{
for (writes = 0; writes < writes_per_op; writes++)
if (write(tmpfile, buf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
die("write failed");
if (lseek(tmpfile, 0, SEEK_SET) == -1)
die("seek failed");
}
gettimeofday(&stop_t, NULL);
close(tmpfile);
print_elapse(start_t, stop_t);
}
#else
printf(NA_FORMAT, "n/a\n");
#endif
if (fs_warning)
{
printf("* This file system and its mount options do not support direct\n");
printf("I/O, e.g. ext4 in journaled mode.\n");
}
}
