APC -> APCu / OPCache, performance poor

Question

I have an m3.xlarge EC2 instance that I updated to PHP 5.5.11 today.

With this update, it overwrote php55-pecl-apc with

Answer 1

Right now you are checking every file on every request for changes, which probably isn't what you want on a production system.

I usually just disable it (remember to restart the web server after making changes):

opcache.validate_timestamps=0

Alternatively, you can try setting the frequency to something other than 0 and keep it enabled:

opcache.validate_timestamps=1  
opcache.revalidate_freq=300

This should theoretically only check for changes every 5 minutes.