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Compare file sync methods using one %dkB write:

Compare file sync methods using two %dkB writes:

Compare open_sync with different write sizes:

Non-sync'ed %dkB writes:

Test if fsync on non-write file descriptor is honored:
 1 * 16kB open_sync write 2 *  8kB open_sync writes 4 *  4kB open_sync writes 8 *  2kB open_sync writes%13.3f ops/sec  %6.0f usecs/op
%d second per test
%d seconds per test
(If the times are similar, fsync() can sync data written on a different
descriptor.)
(This is designed to compare the cost of writing 16kB in different write
open_sync sizes.)
(in wal_sync_method preference order, except fdatasync is Linux's default)
* This file system and its mount options do not support direct
  I/O, e.g. ext4 in journaled mode.
16 *  1kB open_sync writesDirect I/O is not supported on this platform.
O_DIRECT supported on this platform for open_datasync and open_sync.
Try "%s --help" for more information.
Usage: %s [-f FILENAME] [-s SECS-PER-TEST]
could not open output filefsync failedn/an/a*seek failedwrite failedProject-Id-Version: pg_test_fsync (PostgreSQL) 12
Report-Msgid-Bugs-To: pgsql-bugs@lists.postgresql.org
POT-Creation-Date: 2019-05-22 17:56+0800
PO-Revision-Date: 2019-05-31 18:00+0800
Last-Translator: Jie Zhang <zhangjie2@cn.fujitsu.com>
Language-Team: Chinese (Simplified) <zhangjie2@cn.fujitsu.com>
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Language: zh_CN
Plural-Forms: nplurals=2; plural=(n != 1);

使用一个%dkB写操作比较文件同步方法:

使用两个%dkB写操作比较文件同步方法:

在不同的写入大小的情况下比较open_sync:

不同步的写入 %dkB :

测试是否支持非写文件描述符上的fsync:
 1 * 16kB open_sync写入 2 *  8kB open_sync写入 4 *  4kB open_sync写入 8 *  2kB open_sync写入%13.3f ops/sec  %6.0f usecs/op
%d 每次测试的秒数
%d 每次测试的秒数
(如果时间相似，fsync()可以同步写在不同描述符上的数据.)
这是为了比较在写入不同的open_sync大小的情况下写入16kB的时间花费
(按照wal_sync_method首选顺序，fdatasync是Linux的默认值除外)
* 此文件系统及其安装选项不支持直接I/O
  例如. ext4 在 journaled 模式.
16 *  1kB open_sync写入此平台不支持直接I/O.
在此平台上，O_DIRECT支持open_datasync和open_sync.
请用 "%s --help" 获取更多的信息.
用法: %s [-f 文件名] [-s 每次测试的秒数]
无法打开输出文件fsync失败n/an/a*查找失败写入失败