Aug 9, 2011
tom
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APC configuration on Ubuntu 10.4. Problem with apc.shm_size, apc.shm_segments and Apache

Question

I installed apc on my ubuntu 10.4 vps today using the following lines. 

sudo apt-get install php-apc
sudo /etc/init.d/apache2 restart

While everything works fine. I encounter problems configuring APC. I try to increase the allocated memory size. To my understanding I could do this either by increasing the amount of segments apc.shm_segments or apc.shm_size.

If I configure apc.shm_segments and restart/graceful the server apc.php still shows only one segment. In the apache error log I can find the line:

PHP Warning:  PHP Startup: apc.shm_segments setting ignored in MMAP mode in Unknown on line 0

How, would I make APC use apc.shm_segments?

Nevertheless, I’d prefer to use increase apc.shm_size to the 128M I configured as 

kernel.shmmax = 134217728

However, everytime I configure apc.shm_size in /etc/php5/conf.d/apc.ini and restart/gracful apache. Apache does start but hangs. It does not serve any websites and a apache2ctl stop is not regarded anymore.

Has anyone experienced the same and/or knows why I can’t change the shm_size default value?

Many thanks!

Answer

try this config and see if it works:

extension=apc.soapc.enabled=1                  
apc.stat=1apc.shm_segments=1                  
apc.shm_size=256M                  
apc.ttl=7200                        
apc.user_ttl=7200                  
apc.num_files_hint=10000
apc.max_file_size=5M            
apc.mmap_file_mask=/dev/zero
apc.enable_cli=1

Check more discussion of this question.

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