Lighttpd web server and php eAccelerator cache problem

by on August 29, 2006 · 4 comments· LAST UPDATED August 29, 2006

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eAccelerator is a fork of MMCache which provide an opcode cache and encode i.e. it increases performance of php based application by providing web (content) caching for dynamic apps.

Recently one of Linux box, which runs Lighttpd, started to sever php pages very slowly. First, I thought server might be severing large amount of request but netstat just return over 600 connection:
$ netstat -vtn | wc -l

Output:

649

System load was under control:
$ uptime
Output:

12:09:32 up 87 days, 11:58,  1 user,  load average: 1.08, 1.19, 1.06

No zombie process were found. Next I had gone through server logs and error logs and found nothing special. I did restarted both Lightttpd and MySQL servers. Memory usage was under control. HTML pages was loading fine, it was php application. All php based application was taking time to load (but no connection time out error). It was clear something was wrong with PHP.

So I started to investigate all php related installed extension. I found eAccelerator installed on system. I went to /chroot/var/cache/php-eaccelerator and I found over 5000+ files.

I had just deleted all cached files and voila! My problem was solved php started to work normally:
# rm -f *
# /etc/init.d/lighttpd restart

I guess now I need to write a script that will delete cahce on regular basis.

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{ 4 comments… read them below or add one }

1 Anish September 26, 2006 at 6:45 pm

Hi Need a script for that.. can you please provide one…

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2 nixCraft September 26, 2006 at 7:53 pm

Script is quite easy:
#!/bin/sh
CROOT=/var/cache/php-eaccelerator
RSTART="/etc/init.d/lighttpd restart"
cd $CROOT
rm -f *
$RSTART

Reply

3 Steve October 31, 2006 at 10:15 am

There is an option in EA which allows you to disable writting to disk cache. This option in in the php.ini file.

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4 Steve October 31, 2006 at 10:17 am

The option is:

eaccelerator.shm_only

Enable or disable caching of compiled scripts on disk. This has no effect on session data and content caching. Default value is “0” which allows eAccelerator to use disk and shared memory cacche for scripts.

I hope that helps. =)

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