CloudLinux Performance Problems / Resource Limiting

  • My hosting provider recently moved my site to CloudLinux and I’m my site keeps getting limited. It’s a small personal site with less than 50 sessions per day, yet cPanel usage says…

    ? Your site has been limited within the past 24 hours
    ? Virtual memory resources were limited for your site
    ? Physical memory resources were limited for your site
    ? I/O usage resources were limited for your site

    Current Usage
    Description Usage Limit Fault
    CPU Usage 14.0% 100%
    I/O Usage 0.0 KB/s 6144.0 KB/s
    IOPS 0 6144
    Entry Processes 0 40 0
    Number of Processes 0 200 0
    Physical Memory Usage 39.27M 2.00G 0

    My hosting provider is really struggling to find the problem, blaming crawlers, large photos on my site, traceroute etc… I locked down robots.txt file. They then bumped the IO and CPU limits up and the problem keep happening. As a test I moved a copy of the site to a new hosting provider (HostGator) and it is running flawlessly there just like it did on the same hosting provider before the move to CloudLinux, so I’m convinced it is a CloudLinux problem of some sort. Hopefully it is a configuration issue.

    The site usually works fine, its just WordPress admin that is a problem. There’s something that the installed plugins PHP file does that always triggers the problem. If I don’t check the installed plugins page, it hangs for about 3 minutes, then it times out. After it times out once or sometimes twice, it usually works fine for awhile like whatever it was doing finally got what it needed in cache. If I try to install or remove a plugin, I’ll likely run into the problem there too.

    Any ideas or known problems with WordPress on CloudLinux? Could it be a bad disk or a service side network connection retrying? How can I point my hosting provider in the right direction?

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  • Thread Starter dibert

    (@dibert)

    I solved most of the mystery above. It was not really a CloudLinux performance problem, it was a ISP networking issue and a contributing factor was WordPress did not make it easy to see what the problem was.

    One of the WordPress plugins was trying to check for updates and the ISP was blocking the IP address of the plugin site. WordPress hung and then timed out. A second try clicking on “installed plugins” produced the same result. Each timeout took about 3 minutes each, then after two timeouts the “installed plugins” plugin page worked fine.

    The IP address should not have been blocked, however, WordPress didn’t give any error or warning either, which made it very hard to troubleshoot. I’m running WordPress 4.5.2. This is a good candidate for an enhancement for WordPress.

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