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Commit916897c

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< 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.>
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‎doc/TODO‎

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@@ -6,7 +6,7 @@ TODO list for PostgreSQL
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Bracketed items "[]" have more detail.
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Current maintainer:Bruce Momjian (pgman@candle.pha.pa.us)
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Last updated:Mon Nov 810:32:30 EST 2004
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Last updated:Mon Nov 815:16:11 EST 2004
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The most recent version of this document can be viewed at the PostgreSQL web
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site, http://www.PostgreSQL.org.
@@ -644,7 +644,13 @@ Fsync
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Cache
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=====
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* Allow free-behind capability for large sequential scans, perhaps using
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posix_fadvise() [fadvise]
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posix_fadvise()
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Posix_fadvise() can control both sequential/random file caching and
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free-behind behavior, but it is unclear how the setting affects other
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backends that also have the file open, and the feature is not supported
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on all operating systems.
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* Consider use of open/fcntl(O_DIRECT) to minimize OS caching
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* Cache last known per-tuple offsets to speed long tuple access
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