Mod_perl improves performance by loading the perl interpreter and your program once and then keeping these in memory and using them to respond to several requests. Configuration parameters determine how many requests each process or thread handles.

If your server has a pool of processes/threads handling requests, each started at a different time, then each might have a different version of your program loaded. When a new request arrives at the server, it will be passed to one of the available processes/threads. If the server is busy, which process/thread handles the next request will be quite random. Thus, it will sometimes be handled by a process/thread running a recent version of your program and sometimes by one running an old version.

If you stop the server, all processes/threads will be stopped. When you restart it, all new processes/threads will load the then current version of your program. Thus a full shut down and restart of the apache server should solve your problem.

If your users can't tolerate the service disruption, then you can do a "graceful" restart. This allows current processes/threads to finish handling their current requests but then they stop and new processes/threads are started and these will load the current version of your program.

In reply to Re^5: apache/perl caching problem by ig
in thread apache/perl caching problem by ksublondie

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