A very noob question here.
I just installed APC and when I go to the monitoring page (apc.php) and click on the "System Cache Entries" tab I can see a lot of pages on that list after browsing my app that's hosted on the server. To test I restarted apache and all the cache entries were gone but as soon as I started browsing more pages on my app again they started appearing on that list.
I didn't make any changes to my code, so is this all I have to do to enable optcode caching? Or are changes to my code also necessary?
I ask because my app is using codeigniter and there is a page in the codeigniter docs on caching docs that describes code changes: