xcache.size change crashes server [FIX]

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Thought I'd post this up on here for anyone else who searches for this issue and can't figure out what's going on.

 

If you make a change to your xcache configuration, specifically changing the xcache.size variable then, when you restart apache you may find yourself facing a heap of errors:

PHP Fatal error:  xc_fcntl_lock failed errno:9

The problem appears to be the file created at xcache.mmap_path and to resolve everything you need to delete this (or edit the variable for xcache.mmap_path) before restarting apache again.

 

Hard to be sure exactly what happens but that cured things for me so thought I'd pass it along.

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... as a follow on from that...

 

Check that your xcache.size and/or xcache.var_size config settings are under your memory limit setting for apache or you'll get errors like this:

PHP Fatal error: XCache: Cannot create shm in Unknown on line 0
/tmp/xcache: Cannot allocate memory
Failed creating file mapping

 

It's obvious when you actually think about it but figured I'd share the #doh moment