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Update: 

<   posix_fadvise() [fadvise]
>   posix_fadvise()
>
>   Posix_fadvise() can control both sequential/random file caching and
>   free-behind behavior, but it is unclear how the setting affects other
>   backends that also have the file open, and the feature is not supported
>   on all operating systems.
>
This commit is contained in:
Bruce Momjian 2004-11-08 20:16:20 +00:00
parent cd6ecf6829
commit 916897cce7
1 changed files with 8 additions and 2 deletions
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@ -6,7 +6,7 @@ TODO list for PostgreSQL
Bracketed items "[]" have more detail.
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Mon Nov 8 10:32:30 EST 2004
Last updated: Mon Nov 8 15:16:11 EST 2004
The most recent version of this document can be viewed at the PostgreSQL web
site, http://www.PostgreSQL.org.
@ -644,7 +644,13 @@ Fsync
Cache
=====
* Allow free-behind capability for large sequential scans, perhaps using
posix_fadvise() [fadvise]
posix_fadvise()
Posix_fadvise() can control both sequential/random file caching and
free-behind behavior, but it is unclear how the setting affects other
backends that also have the file open, and the feature is not supported
on all operating systems.
* Consider use of open/fcntl(O_DIRECT) to minimize OS caching
* Cache last known per-tuple offsets to speed long tuple access