I’m running PHP version 5.3.3 on CentOS / RHEL 6.x with APC php-pecl-apc-3.1.9. However, I’m getting the following warnings in my php server log

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file:

[01-Jul-2012 10:50:49] PHP Warning: require_once(): Unable to allocate memory for pool. in /var/www/html/includes/admin.php on line 57
[18-Jul-2012 17:00:08] PHP Warning: include_once(): Unable to allocate memory for pool. in //var/www/html/includes/xmlrpc.php on line 55
[18-Jul-2012 17:00:40] PHP Warning: require(): Unable to allocate memory for pool. in /var/www/html/includes/geshi.php on line 2307

How do I fix these php warnings?

This error is usually related to Alternative PHP Cache (APC) related which is a free and open opcode cache for PHP. Its goal is to provide a free, open, and robust framework for caching and optimizing PHP intermediate code. Edit /etc/php.d/apc.ini, enter:
# vi /etc/php.d/apc.ini
Make sure the mktemp-style file_mask to pass to the mmap module is correct and valid one:

 
apc.mmap_file_mask=/tmp/apc.XXXXXX

Next make sure the size of each shared memory segment, with M/G suffix is set correct as per your requirements. In my case it was set to 8M:

 
apc.shm_size=96M

You need to adjust the number of seconds a cache entry is allowed to idle in a slot in case this cache entry slot is needed by another entry:

 
apc.ttl=3600

The number of seconds a user cache entry is allowed to idle in a slot in case this cache entry slot is needed by another entry:

 
apc.user_ttl=3600

The number of seconds that a cache entry may remain on the garbage-collection list.

 
apc.gc_ttl=3600

Save and close the file. Make sure you adjust the values as per your requirements. Restart the Apache 2 web server:
# service httpd restart
If you are using Lighttpd instead of Apache2, restart the Lighttpd web server:
# service lighttpd restart
If you are using Nginx instead of Apache2/Lighttpd, restart the Nginx web server:
# service nginx restart
OR
# /usr/local/nginx/sbin/nginx -s reload

Tip: Find out your APC memory usage and hit ratio

You need to find out exact memory usage and hit ratio so that you can set apc.ttl and apc.shm_size as per your work load. Copy /usr/share/php-pecl-apc/apc.php to your /var/www/html directory (or DocumentRoot):
# cp /usr/share/php-pecl-apc/apc.php /var/www/html
Edit /var/www/html/apc.php and set the admin password :

 
defaults('ADMIN_PASSWORD','YOUR-NEW-PASSWORD-HERE');

Save and close the file. Fire a web-browser and type the url:
http://server-ip-here/apc.php
OR
http://server1.cyberciti.biz/apc.php
Sample outputs:

Apc Memory Status and Hit Ratio Fig.01: Apc Memory Status and Hit Ratio

From the above graph I’m getting 100.0% hit ratio and I’ve used almost all memory. I need to increase memory and reduce ttl value so that I will not get memory allocation error.

References:
  1. PHP APC documentation.

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