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My hosting provider states multisite causes high CPU usage (3 posts)

  1. Mariano Blaya
    Member
    Posted 2 years ago #

    I am quite curious to know your comments on the above sentences from a "Level III Tech Support Engineer" of a well known hosting provider.

    Beyond just the plugins, it seems that you have a single WordPress install utilizing MU to serve all of your various sites. From a performance perspective this is less than ideal and will necessitate a raise in CPU required for each page hit while the server determines which set of WordPress data it is supposed to be working from in the Database layer rather than all the way up at the HTTP request layer where there is nearly no performance cost. Separating these sites out into their own addon domains with their own distinct content would remove this overhead and likely result in another considerable decrease in CPU usage.

  2. I haven't seen any significant performance difference from multiple stand alone sites to one multisite installation but perhaps my sites aren't as popular? ;)

    Separating these sites out into their own addon domains with their own distinct content would remove this overhead and likely result in another considerable decrease in CPU usage.

    I'm reasonably sure that's not right.

    When a WordPress installation is running hot it's often a matter of an errant theme or plugin. Tracking that down can challenging and I was able to do it via a process of elimination. That's true for standalone or multisite.

    Start with reading this article (and follow the links) and see if you can figure out what's causing your installation to run hot like that.

    http://www.wptavern.com/determining-which-plugins-are-slowing-your-site-down

    Also if you can graphically monitor the CPU and memory usage of your web server, you can turn off plugins one at a time and visually see if/when it made a difference. I use Munin but there are many others too.

    http://munin-monitoring.org/

  3. The wrong word is "considerable" - It all really depends on if you have a lot of traffic. Yes, one Multisite blog getting hammered will hurt the others, but it shouldn't cause a signifigant CPU spike. Heck, my solo-blogs crash things more often than the multisites!

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