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php-cgi constantly recycles every couple of minutes

Posted by mindfrost82 
php-cgi constantly recycles every couple of minutes
January 25, 2010 02:15PM
I run a fairly busy site with a Wordpress blog and vBulletin forums. I recently dumped Apache and and using nginx for everything (which has been incredible and I would never go back). I'm using PHP as fastCGI and have a wrapper script to start the process. We average about 1,000 concurrent users at any given time. Usually anywhere from 800 to 1200+.

This is the script I found to start php-cgi:




echo $! > "$PHP_PID"

This has been working great and PHP hasn't completely died on me yet.

The problem that I'm having is that while viewing TOP, php-cgi seems to die and restart about every 2-3 minutes, sometimes as often as every minute. At least it restarts itself, but that can take a couple of seconds, causing a delay if you happen to be browsing the site during this time.

In the above script, I've tried increasing the PHP_FCGI_MAX_REQUESTS, even as high as 1,000,000. I've also tried completely omitting that value. No matter what, php-cgi reacts the same way.

I know it needs to recycle itself to prevent memory leaks, but I don't think it should be happening that often. Any ideas on how to fix this?
Re: php-cgi constantly recycles every couple of minutes
January 27, 2010 12:38PM
I'm not using php-fpm and don't really want to recompile PHP to switch to it. This is the only issue I have with this setup, so any help is appreciated. I tried taking out the PHP_FCGI_MAX_REQUESTS option altogether and it still recycled itself.
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