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Cpu's lock up at 100% when 200+ hit site.

Discussion in 'XenForo Questions and Support' started by andrewkm, Jan 21, 2013.

  1. andrewkm

    andrewkm Active Member

    Alright quick introduction; I run a forum for a gaming server.
    Our board statistics are not too big:
    There are times when we have 200-250 users hit the forums simultaneously (literally at the same time) - either when we run a competition with information on the website; or when our game server goes down for specific updates. All players insta hit the site. At this point I monitor our usage and cpus lock up at 100% and site just doesn't load.

    Can anyone give me any advice on what would be best to update to prevent this from happening.
    When run on a VPS with 2 vcpus and 4gb of ram. Just 2 days ago i bumped it to 3 vcpus and nothing... same lock-up affect... Do I need 4? Do I need to perhaps look into a different setting ? Is something configured wrong?

    Someone shed some light :)

    PS: We are running on a 100mbit line.
  2. Digital Doctor

    Digital Doctor Well-Known Member

    what addons are you using ?
  3. andrewkm

    andrewkm Active Member

  4. Digital Doctor

    Digital Doctor Well-Known Member

    None of those are obvious culprits.
    It's probably not an addon issue.
    [8wayRun.Com] XenPorta (Portal) 1.5.5 - might slow things down with higher traffic.
    [******] Custom Node Icon - 1.0 is available.

    Any errors logged ?
    Social networking (Facebook especially) can slow things down.
    Do you have the server logs from a time when problems were happening ?
  5. Digital Doctor

    Digital Doctor Well-Known Member

    what caching programs are you using ? APC ?
    what php version ?
    what are you server settings ?
    does disk I/O peak when your CPU goes to 100% ?
  6. Luke F

    Luke F Well-Known Member

    Is your mysql server optimised?
    Have you considered moving to nginx+php-fpm if you haven't already?
    Where is the cpu usage primarily coming from (php/webserver or mysqld)?
  7. andrewkm

    andrewkm Active Member

    Hm - I'll get my devs to look into all this shortly and reply to all those questions. Need to wait for another gaming peak time to have 200+ hit the site at the same time again and I'll take more informed reports when its happening.

    We're running on
    PHP: 5.4.7
    Mysql: 5.5.28
    Running nginx
  8. andrewkm

    andrewkm Active Member

    Mysql settings:

  9. Slavik

    Slavik XenForo Moderator Staff Member

    You say 100% cpu, whats using it? httpd, mysql etc?

    When your under heavy load, have your admins SSH in and run the top command to find out.
    Adam Howard and MattW like this.

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