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https://git.postgresql.org/git/postgresql.git
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312 lines
7.6 KiB
C
312 lines
7.6 KiB
C
/*
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* test_fsync.c
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* tests if fsync can be done from another process than the original write
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*/
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#include "../../include/pg_config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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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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#elif defined(O_FSYNC)
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#define OPEN_SYNC_FLAG O_FSYNC
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#endif
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#if defined(OPEN_SYNC_FLAG)
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#if defined(O_DSYNC) && (O_DSYNC != OPEN_SYNC_FLAG)
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#define OPEN_DATASYNC_FLAG O_DSYNC
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#endif
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#endif
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#define WAL_FILE_SIZE (16 * 1024 * 1024)
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void die(char *str);
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void print_elapse(struct timeval start_t, struct timeval elapse_t);
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int
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main(int argc, char *argv[])
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{
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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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loops = 1000;
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char *strout = (char *) malloc(WAL_FILE_SIZE);
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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 < WAL_FILE_SIZE; i++)
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strout[i] = 'a';
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if ((tmpfile = open(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, WAL_FILE_SIZE);
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fsync(tmpfile); /* fsync so later fsync's don't have to do it */
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close(tmpfile);
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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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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(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");
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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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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(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(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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printf("\n");
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/* write, close, fsync */
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gettimeofday(&start_t, NULL);
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for (i = 0; i < loops; i++)
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{
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if ((tmpfile = open(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(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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printf("\n");
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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(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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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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print_elapse(start_t, elapse_t);
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printf("\n");
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/* 2*8k o_sync writes */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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printf("\n");
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printf("\nCompare file sync methods with one 8k write:\n");
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#ifdef OPEN_DATASYNC_FLAG
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/* open_dsync, write */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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#else
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printf("\t(o_dsync unavailable) ");
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#endif
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printf("\n");
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/* open_fsync, write */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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printf("\n");
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#ifdef HAVE_FDATASYNC
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/* write, fdatasync */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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#else
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printf("\t(fdatasync unavailable)");
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#endif
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printf("\n");
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/* write, fsync, close */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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printf("\n");
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printf("\nCompare file sync methods with 2 8k writes:\n");
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#ifdef OPEN_DATASYNC_FLAG
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/* open_dsync, write */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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#else
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printf("\t(o_dsync unavailable) ");
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#endif
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printf("\n");
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/* open_fsync, write */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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printf("\n");
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#ifdef HAVE_FDATASYNC
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/* write, fdatasync */
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if ((tmpfile = open(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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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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print_elapse(start_t, elapse_t);
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#else
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printf("\t(fdatasync unavailable)");
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#endif
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printf("\n");
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/* write, fsync, close */
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if ((tmpfile = open(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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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(filename);
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return 0;
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}
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void
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print_elapse(struct timeval start_t, struct timeval elapse_t)
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{
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if (elapse_t.tv_usec < start_t.tv_usec)
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{
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elapse_t.tv_sec--;
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elapse_t.tv_usec += 1000000;
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}
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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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void
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die(char *str)
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{
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fprintf(stderr, "%s", str);
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exit(1);
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}
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