{"body":"[postgres@aitosfsdb00 ~]$ /usr/pgsql-11/bin/pg_test_fsync --help\nUsage: pg_test_fsync [-f FILENAME] [-s SECS-PER-TEST]\n[postgres@aitosfsdb00 ~]$ /usr/pgsql-11/bin/pg_test_fsync -s 10 -f /tmp/sysc.out\n10 seconds per test\nO_DIRECT supported on this platform for open_datasync and open_sync.\n\nCompare file sync methods using one 8kB write:\n(in wal_sync_method preference order, except fdatasync is Linux's default)\n        open_datasync                                  n/a*\n        fdatasync                        313605.214 ops/sec       3 usecs/op\n        fsync                            314363.297 ops/sec       3 usecs/op\n        fsync_writethrough                              n/a\n        open_sync                                      n/a*\n* This file system and its mount options do not support direct\n  I/O, e.g. ext4 in journaled mode.\n\nCompare file sync methods using two 8kB writes:\n(in wal_sync_method preference order, except fdatasync is Linux's default)\n        open_datasync                                  n/a*\n        fdatasync                        200460.378 ops/sec       5 usecs/op\n        fsync                            198070.597 ops/sec       5 usecs/op\n        fsync_writethrough                              n/a\n        open_sync                                      n/a*\n* This file system and its mount options do not support direct\n  I/O, e.g. ext4 in journaled mode.\n\nCompare open_sync with different write sizes:\n(This is designed to compare the cost of writing 16kB in different write\nopen_sync sizes.)\n         1 * 16kB open_sync write                      n/a*\n         2 *  8kB open_sync writes                     n/a*\n         4 *  4kB open_sync writes                     n/a*\n         8 *  2kB open_sync writes                     n/a*\n        16 *  1kB open_sync writes                     n/a*\n\nTest if fsync on non-write file descriptor is honored:\n(If the times are similar, fsync() can sync data written on a different\ndescriptor.)\n        write, fsync, close              103188.535 ops/sec      10 usecs/op\n        write, close, fsync              104203.139 ops/sec      10 usecs/op\n\nNon-sync'ed 8kB writes:\n        write                            187219.888 ops/sec       5 usecs/op\n[postgres@aitosfsdb00 ~]$","name":"","extension":"txt","url":"https://www.irccloud.com/pastebin/5YJ1EWZE","modified":1691408815,"id":"5YJ1EWZE","size":2262,"lines":44,"own_paste":false,"theme":"","date":1691408815}