From 46651ce6fe013220ed397add242004d764fc0153 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 14:15:05 +0200 Subject: Adding upstream version 14.5. Signed-off-by: Daniel Baumann --- doc/src/sgml/html/pgtestfsync.html | 41 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 doc/src/sgml/html/pgtestfsync.html (limited to 'doc/src/sgml/html/pgtestfsync.html') diff --git a/doc/src/sgml/html/pgtestfsync.html b/doc/src/sgml/html/pgtestfsync.html new file mode 100644 index 0000000..256d107 --- /dev/null +++ b/doc/src/sgml/html/pgtestfsync.html @@ -0,0 +1,41 @@ + +pg_test_fsync
pg_test_fsync
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pg_test_fsync

pg_test_fsync — determine fastest wal_sync_method for PostgreSQL

Synopsis

pg_test_fsync [option...]

Description

+ pg_test_fsync is intended to give you a reasonable + idea of what the fastest 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 significant + difference in real database throughput, especially since many database servers + are not speed-limited by their write-ahead logs. + pg_test_fsync reports average file sync operation + time in microseconds for each wal_sync_method, which can also be used to + inform efforts to optimize the value of commit_delay. +

Options

+ pg_test_fsync accepts the following + command-line options: + +

-f
--filename

+ Specifies the file name to write test data in. + This file should be in the same file system that the + pg_wal directory is or will be placed in. + (pg_wal contains the WAL files.) + The default is pg_test_fsync.out in the current + directory. +

-s
--secs-per-test

+ 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 5 seconds, which allows the program to + complete in under 2 minutes. +

-V
--version

+ Print the pg_test_fsync version and exit. +

-?
--help

+ Show help about pg_test_fsync command line + arguments, and exit. +

+

Environment

+ The environment variable PG_COLOR specifies whether to use + color in diagnostic messages. Possible values are + always, auto and + never. +

See Also

postgres
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