APC cache performance

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  • Andres Baravalle
    #1

    APC cache performance

    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

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    • Rik
      #2
      Re: APC cache performance

      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


        Comment

        • Andres Baravalle
          #3
          Re: APC cache performance


          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

            Comment

            • R. Rajesh Jeba Anbiah
              #4
              Re: APC cache performance

              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/

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