Support » Plugin: W3 Total Cache » W3 Total Cache Great – Newbie Question

  • Hello,
    I’m running a moderately active site (2,000 page view per day) on a VPS with 1GB RAM.

    Got my hosting provider to install APC for me, I installed W3 Total Cache, configured it – using all caching options except object cache and CDN.

    On the front-end side of things…it’s going well. Site is much snappier.

    On the back-end, problems…but I don’t know if it’s W3 related or something else.

    When we (2 of us) post/publish from the administrative interface, it seems to spawn a significant number of processes…which then spikes the CPU and memory use.

    I’m pretty new to WordPress (convert from Joomla), so I’m having a really difficult time tracking this one down. The hosting providers techs are scratching their heads as well.

    I know that W3 Total Cache doesn’t cache anything for logged in users, so I’m a bit mystified here.

    My questions would be…

    1. Are there ways of troubleshooting a plugin issue other than ‘process of elimination’?

    2. Is there an outside chance it’s APC/W3 related?

    I apologize if I’m a bit off-topic here, but it seems like smart folks use this forum…and I’m feeling pretty dumb at the moment.

    Any suggestions are appreciated.


Viewing 5 replies - 1 through 5 (of 5 total)
  • Plugin Author Frederick Townes


    Sounds like APC is poorly configured, this issue has nothing to do with W3TC directly unless your W3TC settings exacerbate and underlying APC issue. You can deactivate W3TC to see if the issue persists, If it does, your settings are exacerbating an underlying issue with APC configuration tuning. Also make sure you’re page caching to disk enhanced and not APC to save resources.

    Ask your host to help you make sure that shm size, fragmentation and caching performance of system and user objects is working properly.



    Hi Frederick,
    Thanks for the suggestions.

    The host said when they installed APC they ran into trouble with it conflicting with Zend. They also said they would install APC but not support it. 🙁

    I’ll post results when I have more info.

    Thanks again,



    One more thing…

    After some googling, it sounds like APC doesn’t work with mod_suphp, which I have installed.

    I’ve asked my host to uninstall APC.

    Chris Olbekson


    Level 12 Bug Squasher & Forum Moderator


    To use APC you have to re compile apache to run mod_php

    APC will not work with Zend Optimizer. You can fix this by going to your php.ini file and commenting out the line that says:

    zend_extension = "/usr/local/Zend/lib/Optimizer-3.3.9/php-5.2.x/"

    just add a ; in front of that line to prevent it from loading and restart apache # /etc/init.d/httpd restart

    Plugin Author Frederick Townes


    Thanks @c3mdigital.

Viewing 5 replies - 1 through 5 (of 5 total)
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