Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commit210622c

Browse files
committed
Provide vectored variant of ReadBuffer().
Break ReadBuffer() up into two steps. StartReadBuffers() andWaitReadBuffers() give us two main advantages:1. Multiple consecutive blocks can be read with one system call.2. Advice (hints of future reads) can optionally be issued to thekernel ahead of time.The traditional ReadBuffer() function is now implemented in terms ofthose functions, to avoid duplication.A new GUC io_combine_limit is defined, and the functions for limitingper-backend pin counts are made into public APIs. Those are providedfor use by callers of StartReadBuffers(), when deciding how many buffersto read at once. The following commit will add a higher level mechanismfor doing that automatically with a practical interface.With some more infrastructure in later work, StartReadBuffers() couldbe extended to start real asynchronous I/O instead of just issuingadvice and leaving WaitReadBuffers() to do the work synchronously.Author: Thomas Munro <thomas.munro@gmail.com>Author: Andres Freund <andres@anarazel.de> (some optimization tweaks)Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com>Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>Reviewed-by: Andres Freund <andres@anarazel.de>Tested-by: Tomas Vondra <tomas.vondra@enterprisedb.com>Discussion:https://postgr.es/m/CA+hUKGJkOiOCa+mag4BF+zHo7qo=o9CFheB8=g6uT5TUm2gkvA@mail.gmail.com
1 parent13b3b62 commit210622c

File tree

7 files changed

+605
-221
lines changed

7 files changed

+605
-221
lines changed

‎doc/src/sgml/config.sgml

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2708,6 +2708,20 @@ include_dir 'conf.d'
27082708
</listitem>
27092709
</varlistentry>
27102710

2711+
<varlistentry id="guc-io-combine-limit" xreflabel="io_combine_limit">
2712+
<term><varname>io_combine_limit</varname> (<type>integer</type>)
2713+
<indexterm>
2714+
<primary><varname>io_combine_limit</varname> configuration parameter</primary>
2715+
</indexterm>
2716+
</term>
2717+
<listitem>
2718+
<para>
2719+
Controls the largest I/O size in operations that combine I/O.
2720+
The default is 128kB.
2721+
</para>
2722+
</listitem>
2723+
</varlistentry>
2724+
27112725
<varlistentry id="guc-max-worker-processes" xreflabel="max_worker_processes">
27122726
<term><varname>max_worker_processes</varname> (<type>integer</type>)
27132727
<indexterm>

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp