Apache :: APC: Different cache entries per fcgi process

rokka · Joined: 05 Apr 2007 Posts: 5

Hi,

we are running the following configuration on a high load webserver:

Apache2.2.4
PHP 5.2.6
APC 3.0.17-dev

But it seems that apc uses different caches for every php process.
When I store a value in the user cache it isn´t available on the next page access. After some page refreshes (F5) you probably get the cache entry.

Another strange thing is the output of the apc.php. You get a different results on every page refresh.

We didn´t get this behavior during the development. Maybe because there was only one php process.

Does anyone have an idea how to get this working.
Maybe other opcode caches don´t have this problem.

Thanks for your help
Andre

Brian White · Joined: 24 Aug 2008 Posts: 21

Every fast-cgi process has its own independent cache. So, what you are seeing is "expected". Can you use mod_php? Or just a single fcgi process? Do you have a back end database that you can use? I know that this would not be preferred but I don't think that any of the opcode caches use a shared memory pool.

rokka · Joined: 05 Apr 2007 Posts: 5

>Every fast-cgi process has its own independent cache. So, what you are seeing is "expected".

Ok, but this makes the combination fcgi + apc nearly useless.

>Can you use mod_php?

I switch to fcgi because I had got the same problem as described in post http://www.apachelounge.com/viewtopic.php?t=1472&highlight=memory

James Blond

I know Steffen uses eaccelerator with runs fine with fcgid.

rokka · Joined: 05 Apr 2007 Posts: 5

Ok, thanks.

I´ll try this too. I can post my expriences with this combination later on...