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* Test to see if calling PreallocXlogFiles() from the background writer
  will help with WAL segment creation latency

  http://archives.postgresql.org/pgsql-patches/2007-06/msg00340.php
This commit is contained in:
Bruce Momjian
2008-03-11 21:06:10 +00:00
parent 955ddc3e7d
commit 56c7614bb2
2 changed files with 60 additions and 42 deletions
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doc/src/FAQ/TODO.html
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@ -8,7 +8,7 @@
<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:bruce@momjian.us">bruce@momjian.us</a>)<br/>
Last updated: Tue Mar 11 16:46:16 EDT 2008
Last updated: Tue Mar 11 17:06:02 EDT 2008
</p>
<p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
@ -1284,7 +1284,31 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-05/msg00450.php">http://archives.postgresql.org/pgsql-hackers/2007-05/msg00450.php</a>
</p>
</li></ul>
<h1><a name="section_20">Miscellaneous Performance</a></h1>
<h1><a name="section_20">Background Writer</a></h1>
<ul>
<li>Consider having the background writer update the transaction status
hint bits before writing out the page
<p> Implementing this requires the background writer to have access to system
catalogs and the transaction status log.
</p>
</li><li>Consider adding buffers the background writer finds reusable to the
free list
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php">http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php</a>
</p>
</li><li>Automatically tune bgwriter_delay based on activity rather then using a
fixed interval
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php">http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php</a>
</p>
</li><li>Consider wither increasing BM_MAX_USAGE_COUNT improves performance
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php">http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php</a>
</p>
</li><li>Test to see if calling PreallocXlogFiles() from the background writer
will help with WAL segment creation latency
<p> <a href="http://archives.postgresql.org/pgsql-patches/2007-06/msg00340.php">http://archives.postgresql.org/pgsql-patches/2007-06/msg00340.php</a>
</p>
</li></ul>
<h1><a name="section_21">Miscellaneous Performance</a></h1>
<ul>
<li>Do async I/O for faster random read-ahead of data
@ -1315,22 +1339,6 @@ first. There is also a developer's wiki at<br/>
two because a heap row cannot be more than 64k in length
</li></ul>
</li><li>Consider increasing NUM_CLOG_BUFFERS
</li><li>Consider having the background writer update the transaction status
hint bits before writing out the page
<p> Implementing this requires the background writer to have access to system
catalogs and the transaction status log.
</p>
</li><li>Consider adding buffers the background writer finds reusable to the
free list
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php">http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php</a>
</p>
</li><li>Automatically tune bgwriter_delay based on activity rather then using a
fixed interval
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php">http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php</a>
</p>
</li><li>Consider wither increasing BM_MAX_USAGE_COUNT improves performance
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php">http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php</a>
</p>
</li><li>Allow user configuration of TOAST thresholds
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2007-02/msg00213.php">http://archives.postgresql.org/pgsql-hackers/2007-02/msg00213.php</a>
</p>
@ -1351,7 +1359,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-bugs/2008-02/msg00157.php">http://archives.postgresql.org/pgsql-bugs/2008-02/msg00157.php</a>
</p>
</li></ul>
<h1><a name="section_21">Source Code</a></h1>
<h1><a name="section_22">Source Code</a></h1>
<ul>
<li>Add use of 'const' for variables in source tree
@ -1418,7 +1426,7 @@ first. There is also a developer's wiki at<br/>
of result sets using new statement protocol
</li></ul>
</li></ul>
<h1><a name="section_22">Exotic Features</a></h1>
<h1><a name="section_23">Exotic Features</a></h1>
<ul>
<li>Add pre-parsing phase that converts non-ISO syntax to supported
@ -1445,7 +1453,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2008-01/msg00893.php">http://archives.postgresql.org/pgsql-hackers/2008-01/msg00893.php</a>
</p>
</li></ul>
<h1><a name="section_23">Features We Do <u>Not</u> Want</a></h1>
<h1><a name="section_24">Features We Do <u>Not</u> Want</a></h1>
<ul>
<li>All backends running as threads in a single process (not wanted)