Feature #270: use O_NOATIME to open files - Lighttpd - lighty labs

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Feature #270

closed

use O_NOATIME to open files

Added by Anonymous over 19 years ago. Updated over 16 years ago.

Status:

Wontfix

Priority:

Normal

Category:

core

Target version:

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Description

Another idea for performance

O_NOATIME flag (Linux 2.6.8) in open file, in order to avoid updating
access time; this can be useful to reduce the number of background disk
updates when serving lots of files and for some reason file system is
not mounted with noatime attribute.

http://www.tin.org/bin/man.cgi?section=2&topic=open

Cherokee uses this ifdef mechanism
#ifdef O_NOATIME

define CHE_O_READ O_RDONLY | O_NOATIME
#else
define CHE_O_READ O_RDONLY
#endif

-- yusufg

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Updated by Anonymous over 19 years ago

I'd rather this wasn't implemented. If the sysadmin has not used noatime to mount a filesystem then it reasonable to assume he wants atimes updated.

-- Caesium

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Updated by Anonymous over 19 years ago

I would have to agree with Caesium on that. It is not the programs responsibility to decide not to update the atime on a file. I could lead to confusing problems with garbage collection routines. Consider the following:

% find /usr/local/www/vhosts/*/tmp/php/session/ ! -type d -amin +90 -delete

If the sysadmin doesn't want the atime on a file updated he should mount the filesystem with the noatime flag.

-- Patrick Brennan

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