mirror of
https://github.com/postgres/postgres.git
synced 2025-11-09 06:21:09 +03:00
76 lines
2.0 KiB
Plaintext
76 lines
2.0 KiB
Plaintext
<!-- doc/src/sgml/pgtestfsync.sgml -->
|
|
|
|
<sect1 id="pgtestfsync" xreflabel="pg_test_fsync">
|
|
<title>pg_test_fsync</title>
|
|
|
|
<indexterm zone="pgtestfsync">
|
|
<primary>pg_test_fsync</primary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
<application>pg_test_fsync</> is intended to give you a reasonable
|
|
idea of what the fastest <xref linkend="guc-wal-sync-method"> is on your
|
|
specific system,
|
|
as well as supplying diagnostic information in the event of an
|
|
identified I/O problem. However, differences shown by pg_test_fsync
|
|
might not make any difference in real database throughput, especially
|
|
since many database servers are not speed-limited by their transaction
|
|
logs.
|
|
</para>
|
|
|
|
<sect2>
|
|
<title>Usage</title>
|
|
|
|
<synopsis>
|
|
pg_test_fsync [options]
|
|
</synopsis>
|
|
|
|
<para>
|
|
<application>pg_test_fsync</application> accepts the following
|
|
command-line options:
|
|
|
|
<variablelist>
|
|
|
|
<varlistentry>
|
|
<term><option>-f</option></term>
|
|
<term><option>--filename</option></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the file name to write test data in.
|
|
This file should be in the same file system that the
|
|
<filename>pg_xlog</> directory is or will be placed in.
|
|
(<filename>pg_xlog</> contains the <acronym>WAL</> files.)
|
|
The default is <filename>pg_test_fsync.out</> in the current
|
|
directory.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><option>-s</option></term>
|
|
<term><option>--secs-per-test</option></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the number of seconds for each test. The more time
|
|
per test, the greater the test's accuracy, but the longer it takes
|
|
to run. The default is 2 seconds, which allows the program to
|
|
complete in about 30 seconds.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</para>
|
|
|
|
</sect2>
|
|
|
|
<sect2>
|
|
<title>Author</title>
|
|
|
|
<para>
|
|
Bruce Momjian <email>bruce@momjian.us</email>
|
|
</para>
|
|
</sect2>
|
|
|
|
</sect1>
|