APC cache performance

[Andres Baravalle]

Hi,
I have tested APC cache on my server with strange results.

I have analysed my statistics and seen which pages are more requested.
And I have used Junit to load test the pages, both with and without APC
cache, requesting the same set of pages 500 times.

The results have not been good. Apparently in many cases the
performance of PHP with APC cache are lower than standalone PHP.

Anyone had similar experiences?

Andres

[Rik]

Andres Baravalle wrote:

Hi,
I have tested APC cache on my server with strange results.

I have analysed my statistics and seen which pages are more requested.
And I have used Junit to load test the pages, both with and without
APC cache, requesting the same set of pages 500 times.

The results have not been good. Apparently in many cases the
performance of PHP with APC cache are lower than standalone PHP.

Anyone had similar experiences?

Not really, but wether or not it's lucrative to cache a page is highly
dependant on the speed it can be build in the first place, and your exact
caching system. The building of the page might often be done quite faster
then getting it from the cache. It highly depends.
--
Grtz,

Rik Wasmus

[Andres Baravalle]

Rik wrote:

Not really, but wether or not it's lucrative to cache a page is highly
dependant on the speed it can be build in the first place, and your exact
caching system. The building of the page might often be done quite faster
then getting it from the cache. It highly depends.

Hi Rik,
that's what I was expecting. But I have tested APC cache against some
quite heavy pages (some pages part of my drupal web site and some pages
part of phpGrabComics). Some of those pages are really slow, and
nevertheless I often cannot see an increase in performance with APC
cache.

I was wondering if it might be a configuration problem or if that's how
it is.

Andres

[R. Rajesh Jeba Anbiah]

Andres Baravalle wrote:
<snip>

The results have not been good. Apparently in many cases the
performance of PHP with APC cache are lower than standalone PHP.

APC is compiler opcode cache. IIRC, that will be much helpful if
the script uses many includes and functions; otherwise it wouldn't help
as the optimizer is not turned on yet (in code, again IIRC). So, it
will be much helpful to profile the code than use caching system in the
first hand.

--
<?php echo 'Just another PHP saint'; ?>
Email: rrjanbiah-at-Y!com Blog: http://rajeshanbiah.blogspot.com/