Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’m currently running several copies of PHP/FastCGI, with APC enabled (under Apache+mod_fastcgi, if that matters). Can I share cache between the processes? How can I check if it’s shared already? (I think the apc.mmap_file_mask ini setting might be involved, but I don’t know how to use it.)
(One of the reasons I think its not shared at the moment is that the apc.mmap_file_mask, as reported by the apc.php web interface flips between about 3 different values as I reload.)
APC does not currently share its cache between multiple php-cgi workers running under fastcgi or fcgid. See this feature request for details: “this behaviour is the intended one as of now”.
One workaround is to allow PHP to manage its own workers. You can do this using the PHP_FCGI_CHILDREN environment variable in your wrapper script (plenty of examples all over the web for that). You should also stop fastcgi/fcgid from spawning more than one PHP process if you want to use this method.
The disadvantage with PHP_FCGI_CHILDREN is that its management of the workers is not as good as that provided by fcgid/fastcgi.
So, there we are. APC in a fcgid/fastcgi environment means giving each PHP worker their own cache, or disabling fcgid/fastcgi’s process spawning in favor of PHP’s built-in management. Let’s hope this changes in the future.