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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
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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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52
doc/TODO
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@ -1,7 +1,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Tue Mar 11 16:46:16 EDT 2008
Last updated: Tue Mar 11 17:06:02 EDT 2008
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -1474,6 +1474,36 @@ Optimizer / Executor
Background Writer
=================
* Consider having the background writer update the transaction status
hint bits before writing out the page
Implementing this requires the background writer to have access to system
catalogs and the transaction status log.
* Consider adding buffers the background writer finds reusable to the
free list
http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php
* Automatically tune bgwriter_delay based on activity rather then using a
fixed interval
http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php
* Consider wither increasing BM_MAX_USAGE_COUNT improves performance
http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php
* 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
Miscellaneous Performance
=========================
@ -1508,26 +1538,6 @@ Miscellaneous Performance
two because a heap row cannot be more than 64k in length
* Consider increasing NUM_CLOG_BUFFERS
* Consider having the background writer update the transaction status
hint bits before writing out the page
Implementing this requires the background writer to have access to system
catalogs and the transaction status log.
* Consider adding buffers the background writer finds reusable to the
free list
http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php
* Automatically tune bgwriter_delay based on activity rather then using a
fixed interval
http://archives.postgresql.org/pgsql-hackers/2007-04/msg00781.php
* Consider wither increasing BM_MAX_USAGE_COUNT improves performance
http://archives.postgresql.org/pgsql-hackers/2007-06/msg01007.php
* Allow user configuration of TOAST thresholds
http://archives.postgresql.org/pgsql-hackers/2007-02/msg00213.php

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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)