php-cgi constantly recycles every couple of minutes
nginx-forum at nginx.us
Mon Jan 25 22:17:25 MSK 2010
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:
env -i PHP_FCGI_CHILDREN=$PHP_FCGI_CHILDREN \
$PHP -b $FCGI_BIND_ADDRESS &
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?
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,45516,45516#msg-45516
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