high cpu load index.php wordpress(100%cpu)

  • ninopro

    (@ninopro)


    11 years, 4 months ago

    I moved my site to a virtual private server(VPS) because my sharing web hosting account doesn’t support the growing number of visitors, but when i install it, CPU spikes to 100% and the site doesn’t load.
    please check these two screenshots http://i.imgur.com/KUxdrgV.jpg http://i.imgur.com/0vG6sGt.jpg

    I tried everything; desactivating all plugins, deleting all plugins, checking database, installing a fresh copy of WordPress but still the same problem.

    Plugins:
    All In One SEO Pack
    Attachment Pages Redirect
    Autoptimize
    Contact Form 7
    Disqus Comment System
    HTML Javascript Adder
    iThemes Security
    No Image Link
    Official StatCounter Plugin
    WordPress Related Posts
    Responsive Lightbox
    WP-PageNavi
    WP-ReportPost
    Wp Pagenavi Style
    WP Smush.it
    WP Super Cache

    i updated all plugins and wordpress

    VPS centos 6.5 : 5GO RAM, 50GO Disk, CPU 2 vCore(2.0 GHz+)

    Apache Version 2.4.10
    PHP Version 5.3.29
    MySQL Version 5.5.40-cll

    number of visitors between 300000 and 500000

    online visitors now between 200 and 300

    Please someone help, i have been struggling for months to find a solution.

Viewing 15 replies - 1 through 15 (of 15 total)
  • Frank Goossens

    (@futtta)

    11 years, 4 months ago

    Well, do you have a PHP opcode cache component installed (APC, typically)?

    Thread Starter ninopro

    (@ninopro)

    11 years, 4 months ago

    Thanks for being here Frank.
    I have installed eAccelerator, the site works but the load is very slow, cpu always 85% http://i.imgur.com/50W5UIB.jpg
    still don’t understand the problem with index.php that causes high cpu usage.

    Frank Goossens

    (@futtta)

    11 years, 4 months ago

    all wordpress requests go through index.php, so ..

    next up; disable all plugins except for wp super cache and check (in wp-content/cache) if cache-files are being generated.

    frank

    Thread Starter ninopro

    (@ninopro)

    11 years, 4 months ago

    yes they are.
    i disabled all plugins except wp super cache at 9:40 PM and its still generating cache-files http://i.imgur.com/yzrKYUM.jpg.
    cpu between 40% and 70% with only wp super cache enabled. http://i.imgur.com/zfSMkAm.jpg

    do you think the number of visitors is the problem ?
    do i have to move to a dedicated sever ?
    or it’s a bad vps configuration.

    Frank Goossens

    (@futtta)

    11 years, 4 months ago

    well, from 100% over 85% to 40-70%, you’re definitively going in the right direction there, no? 🙂

    the number of visitors is not negligible, a dedicated server (or cloud hosting) might be interesting, depending on answers to some of below questions;
    * are the visitors logged to wordpress, or anonymous?
    * how many posts&pages do you have?
    * are visitors bound to visit lots of different posts/pages, or are there some pages that stand out?
    * what is wp super cache’s cache timeout?

    frank

    Thread Starter ninopro

    (@ninopro)

    11 years, 4 months ago

    anonymous visitors
    2600 posts and 5 pages
    visitors stats http://i.imgur.com/uS11uC9.jpg
    right now on site google analytics http://i.imgur.com/M6cWWTz.jpg

    yes visitors are seeing different posts and pages

    cash timeout : http://i.imgur.com/OgsZxYy.jpg

    Frank Goossens

    (@futtta)

    11 years, 4 months ago

    with those numbers (pageviews/day and per minute) a dedicated server should indeed be on your wishlist. alternatively you could sign up with cloudflare or fastly, who’ll be able to absorb that traffic way better.

    on you current set-up, I would advise to up the cache timeout significantly (mine is at 86400 seconds = 24h), which should lower the CPU-load some more.

    hope this helps,
    frank

    Thread Starter ninopro

    (@ninopro)

    11 years, 4 months ago

    Thank you so much for being here, god bless you.

    Dignified Labs

    (@dignifiedbimpe)

    11 years ago

    @ninopro I have a very similar setup and problem to yours.

    Did you ever find a solution to your problem? If you did, do you mind sharing.

    I’m also on a VPS server with 4GB ram. I’m already using Cloudflare but my problem still persists.

    Frank Goossens

    (@futtta)

    11 years ago

    Afternoon dignifiedbimpe;
    There’s no one solution for “high CPU-load”, go through the questions/ remarks posted earlier (opcode caching, page caching plugin, disabling other plugins, …) and see which of those applies to your specific context. Feel free to post your own answers/ findings here and I’ll be happy to provide you with some guidance.

    Kind regards,
    frank

    Thread Starter ninopro

    (@ninopro)

    10 years, 12 months ago

    @dignifiedbimpe
    First we thought that the high load was caused by a plugin but it appeared that our website traffic was growing so fast so we moved to a dedicated server.
    Everything was ok but after a few days the same thing happened so we hosted the website on 3 servers; 1 database server and 2 webservers.

    1 vps server for the database.
    2 dedicated servers for the files, plugins and images…

    Now we have more than 200 000 daily visitors and everything is working fine.

    I didn’t do that by myself, my webhosting did it for me and it’s not very complicated.

    Dignified Labs

    (@dignifiedbimpe)

    10 years, 12 months ago

    Thank you both for your feedback. I have just tried all the procedures suggested by Frank Gossens.

    I have installed APC on my VPS server, but my high CPU load problem still persists.

    Annoyingly it also appears my server gets high CPU load whenever i publish a new post on my wordpress site.

    I have also tried deactivating and reactivating all plugins. The screenshots below are my findings so far.

    After de-activating all plugins, this was the reading on my server…
    http://idey.me/wp-content/uploads/2015/05/Post-plugin-disable.png

    I went a step further and also switched to the default wordpress theme…
    http://idey.me/wp-content/uploads/2015/05/Post-plugin-disable-twenty-fifteen-theme.png

    I then re-activated all my plugins…
    http://idey.me/wp-content/uploads/2015/05/Post-plugin-renable-twenty-fifteen-theme.png

    As you can see from the screenshots that there is also a random CPU drain by the root user and I don’t know why. I am mostly in my WordPress frontend, hardly ever go into root.

    @ninpro, i have also considered your suggestion but it sounds quite expensive to have multiple servers. I currently find my VPS account with bluehost expensive as it is already.

    Plus, i don’t even have up to 2000 users coming on the site daily.

    Bluehost claims they can’t help with VPS installations as they are not configured by them. I constantly get hit with the “hire a developer to optimise your site” response.

    Thanks you advance for your responses guys.

    Dignified Labs

    (@dignifiedbimpe)

    10 years, 12 months ago

    My website appears to be very fine on the front-end, but on the back-end all is not well.

    You can test the frontend yourself on pingdom or gtmetrix.

    http://idey.me

    Frank Goossens

    (@futtta)

    10 years, 12 months ago

    hmm … the whostmgr processes apparently are monitoring processes, which you can’t do a thing about. but CPU usage does not seem that high on those screenshots (when ignoring whostmgr)? still, performance of a VPS is hard to troubleshoot as the hoster did not configure the guest-OS, but the customer did not configure the host-OS. going to a dedicated server could indeed be expensive, but you could upgrade your VPS-plan, I guess?

    specifically for wordpress; make sure you have APC active and install a page caching plugin (hyper cache or wp super cache). posting new posts (or comments) will however always cause a brief higher CPU-load, as this involves PHP (WP) and your database.

    frank

    Dignified Labs

    (@dignifiedbimpe)

    10 years, 11 months ago

    Just to update you all, I eventually made up my mind and moved my site to a new host.

    My site is now performing much better and faster on a the VPS server (4gb RAM, 2CPU & 200gb SSD Disk drive + Memcache + Cloudflare Pro).

    Occasionally I still the “index.php” process using as much as 49% CPU, but this does not seem to affect the server half as much as it did on the previous server.

    Thanks for all your help.

Viewing 15 replies - 1 through 15 (of 15 total)

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