mirror of
https://git.postgresql.org/git/postgresql.git
synced 2025-01-24 18:55:04 +08:00
Copy fsync() defines into test_fsync.c, someday place them in an
include. Propery align for O_DIRECT. Check for write()/fsync() failures.
This commit is contained in:
Bruce Momjian
parent
f14d43d2d3
commit
0d9e0d9dde
@ -1,10 +1,12 @@
|
||||
/*
|
||||
* test_fsync.c
|
||||
* tests if fsync can be done from another process than the original write
|
||||
* test various fsync() methods
|
||||
*/
|
||||
|
||||
#include "../../include/pg_config.h"
|
||||
#include "../../include/pg_config_os.h"
|
||||
#include "postgres.h"
|
||||
|
||||
#include "access/xlog_internal.h"
|
||||
#include "access/xlog.h"
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
@ -14,29 +16,94 @@
|
||||
#include <time.h>
|
||||
#include <sys/time.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
|
||||
/* ---------------------------------------------------------------
|
||||
* Copied from xlog.c. Some day this should be moved an include file.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Because O_DIRECT bypasses the kernel buffers, and because we never
|
||||
* read those buffers except during crash recovery, it is a win to use
|
||||
* it in all cases where we sync on each write(). We could allow O_DIRECT
|
||||
* with fsync(), but because skipping the kernel buffer forces writes out
|
||||
* quickly, it seems best just to use it for O_SYNC. It is hard to imagine
|
||||
* how fsync() could be a win for O_DIRECT compared to O_SYNC and O_DIRECT.
|
||||
* Also, O_DIRECT is never enough to force data to the drives, it merely
|
||||
* tries to bypass the kernel cache, so we still need O_SYNC or fsync().
|
||||
*/
|
||||
#ifdef O_DIRECT
|
||||
#define PG_O_DIRECT O_DIRECT
|
||||
#else
|
||||
#define PG_O_DIRECT 0
|
||||
#endif
|
||||
|
||||
/*
|
||||
* This chunk of hackery attempts to determine which file sync methods
|
||||
* are available on the current platform, and to choose an appropriate
|
||||
* default method. We assume that fsync() is always available, and that
|
||||
* configure determined whether fdatasync() is.
|
||||
*/
|
||||
#if defined(O_SYNC)
|
||||
#define BARE_OPEN_SYNC_FLAG O_SYNC
|
||||
#elif defined(O_FSYNC)
|
||||
#define BARE_OPEN_SYNC_FLAG O_FSYNC
|
||||
#endif
|
||||
#ifdef BARE_OPEN_SYNC_FLAG
|
||||
#define OPEN_SYNC_FLAG (BARE_OPEN_SYNC_FLAG | PG_O_DIRECT)
|
||||
#endif
|
||||
|
||||
#if defined(O_DSYNC)
|
||||
#if defined(OPEN_SYNC_FLAG)
|
||||
/* O_DSYNC is distinct? */
|
||||
#if O_DSYNC != BARE_OPEN_SYNC_FLAG
|
||||
#define OPEN_DATASYNC_FLAG (O_DSYNC | PG_O_DIRECT)
|
||||
#endif
|
||||
#else /* !defined(OPEN_SYNC_FLAG) */
|
||||
/* Win32 only has O_DSYNC */
|
||||
#define OPEN_DATASYNC_FLAG (O_DSYNC | PG_O_DIRECT)
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#if defined(OPEN_DATASYNC_FLAG)
|
||||
#define DEFAULT_SYNC_METHOD_STR "open_datasync"
|
||||
#define DEFAULT_SYNC_METHOD SYNC_METHOD_OPEN
|
||||
#define DEFAULT_SYNC_FLAGBIT OPEN_DATASYNC_FLAG
|
||||
#elif defined(HAVE_FDATASYNC)
|
||||
#define DEFAULT_SYNC_METHOD_STR "fdatasync"
|
||||
#define DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC
|
||||
#define DEFAULT_SYNC_FLAGBIT 0
|
||||
#elif defined(HAVE_FSYNC_WRITETHROUGH_ONLY)
|
||||
#define DEFAULT_SYNC_METHOD_STR "fsync_writethrough"
|
||||
#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC_WRITETHROUGH
|
||||
#define DEFAULT_SYNC_FLAGBIT 0
|
||||
#else
|
||||
#define DEFAULT_SYNC_METHOD_STR "fsync"
|
||||
#define DEFAULT_SYNC_METHOD SYNC_METHOD_FSYNC
|
||||
#define DEFAULT_SYNC_FLAGBIT 0
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* Limitation of buffer-alignment for direct IO depends on OS and filesystem,
|
||||
* but XLOG_BLCKSZ is assumed to be enough for it.
|
||||
*/
|
||||
#ifdef O_DIRECT
|
||||
#define ALIGNOF_XLOG_BUFFER XLOG_BLCKSZ
|
||||
#else
|
||||
#define ALIGNOF_XLOG_BUFFER ALIGNOF_BUFFER
|
||||
#endif
|
||||
|
||||
/* ------------ from xlog.c --------------- */
|
||||
|
||||
#ifdef WIN32
|
||||
#define FSYNC_FILENAME "./test_fsync.out"
|
||||
#else
|
||||
/* /tmp might be a memory file system */
|
||||
#define FSYNC_FILENAME "/var/tmp/test_fsync.out"
|
||||
#endif
|
||||
|
||||
/* O_SYNC and O_FSYNC are the same */
|
||||
#if defined(O_SYNC)
|
||||
#define OPEN_SYNC_FLAG O_SYNC
|
||||
#elif defined(O_FSYNC)
|
||||
#define OPEN_SYNC_FLAG O_FSYNC
|
||||
#elif defined(O_DSYNC)
|
||||
#define OPEN_DATASYNC_FLAG O_DSYNC
|
||||
#endif
|
||||
|
||||
#if defined(OPEN_SYNC_FLAG)
|
||||
#if defined(O_DSYNC) && (O_DSYNC != OPEN_SYNC_FLAG)
|
||||
#define OPEN_DATASYNC_FLAG O_DSYNC
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#define WAL_FILE_SIZE (16 * 1024 * 1024)
|
||||
#define WRITE_SIZE (16 * 1024)
|
||||
|
||||
void die(char *str);
|
||||
void print_elapse(struct timeval start_t, struct timeval elapse_t);
|
||||
@ -49,7 +116,7 @@ main(int argc, char *argv[])
|
||||
int tmpfile,
|
||||
i,
|
||||
loops = 1000;
|
||||
char *strout = (char *) malloc(WAL_FILE_SIZE);
|
||||
char *full_buf = (char *) malloc(XLOG_SEG_SIZE), *buf;
|
||||
char *filename = FSYNC_FILENAME;
|
||||
|
||||
if (argc > 2 && strcmp(argv[1], "-f") == 0)
|
||||
@ -62,15 +129,20 @@ main(int argc, char *argv[])
|
||||
if (argc > 1)
|
||||
loops = atoi(argv[1]);
|
||||
|
||||
for (i = 0; i < WAL_FILE_SIZE; i++)
|
||||
strout[i] = 'a';
|
||||
for (i = 0; i < XLOG_SEG_SIZE; i++)
|
||||
full_buf[i] = 'a';
|
||||
|
||||
if ((tmpfile = open(filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) == -1)
|
||||
die("Cannot open output file.");
|
||||
write(tmpfile, strout, WAL_FILE_SIZE);
|
||||
fsync(tmpfile); /* fsync so later fsync's don't have to do it */
|
||||
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);
|
||||
@ -78,7 +150,8 @@ main(int argc, char *argv[])
|
||||
{
|
||||
if ((tmpfile = open(filename, O_RDWR)) == -1)
|
||||
die("Cannot open output file.");
|
||||
write(tmpfile, strout, 8192);
|
||||
if (write(tmpfile, buf, WRITE_SIZE/2) != WRITE_SIZE/2)
|
||||
die("write failed");
|
||||
close(tmpfile);
|
||||
}
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
@ -95,8 +168,10 @@ main(int argc, char *argv[])
|
||||
{
|
||||
if ((tmpfile = open(filename, O_RDWR)) == -1)
|
||||
die("Cannot open output file.");
|
||||
write(tmpfile, strout, 8192);
|
||||
fsync(tmpfile);
|
||||
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)) == -1)
|
||||
die("Cannot open output file.");
|
||||
@ -114,12 +189,14 @@ main(int argc, char *argv[])
|
||||
{
|
||||
if ((tmpfile = open(filename, O_RDWR)) == -1)
|
||||
die("Cannot open output file.");
|
||||
write(tmpfile, strout, 8192);
|
||||
if (write(tmpfile, buf, WRITE_SIZE/2) != WRITE_SIZE/2)
|
||||
die("write failed");
|
||||
close(tmpfile);
|
||||
/* reopen file */
|
||||
if ((tmpfile = open(filename, O_RDWR)) == -1)
|
||||
die("Cannot open output file.");
|
||||
fsync(tmpfile);
|
||||
if (fsync(tmpfile) != 0)
|
||||
die("fsync failed");
|
||||
close(tmpfile);
|
||||
}
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
@ -135,7 +212,8 @@ main(int argc, char *argv[])
|
||||
die("Cannot open output file.");
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
write(tmpfile, strout, 16384);
|
||||
if (write(tmpfile, buf, WRITE_SIZE) != WRITE_SIZE)
|
||||
die("write failed");
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
close(tmpfile);
|
||||
printf("\tone 16k o_sync write ");
|
||||
@ -148,8 +226,10 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
write(tmpfile, strout, 8192);
|
||||
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);
|
||||
@ -169,7 +249,8 @@ main(int argc, char *argv[])
|
||||
die("Cannot open output file.");
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
write(tmpfile, strout, 8192);
|
||||
if (write(tmpfile, buf, WRITE_SIZE/2) != WRITE_SIZE/2)
|
||||
die("write failed");
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
close(tmpfile);
|
||||
printf("\topen o_dsync, write ");
|
||||
@ -181,7 +262,8 @@ main(int argc, char *argv[])
|
||||
die("Cannot open output file.");
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
write(tmpfile, strout, 8192);
|
||||
if (write(tmpfile, buf, WRITE_SIZE/2) != WRITE_SIZE/2)
|
||||
die("write failed");
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
close(tmpfile);
|
||||
printf("\topen o_sync, write ");
|
||||
@ -199,7 +281,8 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
if (write(tmpfile, buf, WRITE_SIZE/2) != WRITE_SIZE/2)
|
||||
die("write failed");
|
||||
fdatasync(tmpfile);
|
||||
}
|
||||
gettimeofday(&elapse_t, NULL);
|
||||
@ -217,8 +300,10 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
fsync(tmpfile);
|
||||
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);
|
||||
@ -235,8 +320,10 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
write(tmpfile, strout, 8192);
|
||||
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);
|
||||
@ -254,8 +341,10 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
write(tmpfile, strout, 8192);
|
||||
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);
|
||||
@ -271,8 +360,10 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
write(tmpfile, strout, 8192);
|
||||
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);
|
||||
@ -290,9 +381,12 @@ main(int argc, char *argv[])
|
||||
gettimeofday(&start_t, NULL);
|
||||
for (i = 0; i < loops; i++)
|
||||
{
|
||||
write(tmpfile, strout, 8192);
|
||||
write(tmpfile, strout, 8192);
|
||||
fsync(tmpfile);
|
||||
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);
|
||||
@ -300,6 +394,7 @@ main(int argc, char *argv[])
|
||||
print_elapse(start_t, elapse_t);
|
||||
printf("\n");
|
||||
|
||||
free(full_buf);
|
||||
unlink(filename);
|
||||
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user