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Bug #37944 Very Slow session_start on nfs-mount
Submitted: 2006-06-28 10:04 UTC Modified: 2006-06-28 11:13 UTC
From: g42 at gmx dot net Assigned:
Status: Not a bug Package: Session related
PHP Version: 5.1.4 OS: Gentoo Linux 2006.0
Private report: No CVE-ID: None
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 [2006-06-28 10:04 UTC] g42 at gmx dot net 
Description:
------------
Some PHP-Sites take very long to load (>60 seconds). A famous example is phpmyadmin. The wait-time accours after login, oder after changing the database. CacheGrind (created with xdebug) shows that php::session_start takes 60.011ms to start (1 call) while changing to another Database. The total script took 60.112ms

php.ini changes:
session.save_path = "/www/phptemp/sessions"

/www is a nfs-mount, mounted with options:
soft,retry=5,nfsvers=3,posix,tcp

server-export:
/raid/www       192.168.1.0/24(rw,sync,root_squash)

Reproduce code:
---------------
see phpmyadmin-2.8.1 http://www.phpmyadmin.net

Expected result:
----------------
script-execution time <1 second

Actual result:
--------------
script-execution time >60 seconds

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 [2006-06-28 10:29 UTC] tony2001@php.net 
Apparently it was bad idea to use NFS for script, as I/O operations are very slow with NFS.
Not PHP problem.
 [2006-06-28 11:13 UTC] g42 at gmx dot net 
sorry, but a difference of 60 seconds just can't really be a problem of slow I/O. It's some kind of timeout i think, because all other sites on this share are fast as hell, except those who use sessions as well...

if i change session.save_path to "/tmp" (which is on a local reiserfs-partition) everything runs smooth and without these problems...
 
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