Re: Using mod_mem_cache with MPM

["Kunal Shah" <kunal.software.engineer@xxxxxxxxx>]

Thanks Joshua for your response.  I hope this is documented somewhere.

I was wondering if any other disk operation e.g. cleanup would interfere and degrade the overall performance.

Thanks,
Kunal

On Tue, Apr 22, 2008 at 1:22 PM, Joshua Slive <joshua@xxxxxxxx> wrote:

On Tue, Apr 22, 2008 at 2:02 PM, Kunal Shah
<kunal.software.engineer@xxxxxxxxx> wrote:
> Is mod_mem_cache modules "cache" is shared among the Multiple processes
> started using MPM module?  Is there any special configuration needed?

The cache is shared between all works in the same process. That means
it will be mostly-shared when using threaded mpms (worker/event) but
not when using process-based mpms (prefork).

>
> My tests with mod_disk_cache works with MPM module, since all processes
> points to the same "cache directory" and finds it.

Yes, the disk cache is shared.

As I've already mentioned this week, in many circumstances the disk
cache will outperform the memory cache because it offloads the work of
cache and memory management to the highly-optimized kernel filesystem
code. A modern OS will keep frequently-accessed parts of the cache in
the buffer cache, so you don't suffer a speed penalty from the disk
access.

Joshua.

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