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High CPU load

  • Hello there,
    I’m posting this to know if other people had the same problem.

    Every 2/3 days or so i get a very high CPU load on my server.

    I had no problem with my server for a long time, and since i migrated one of my sites to WPMU, i get this issue, which sometimes creates a HUGE php5/cgi queue and ends up in the server being overloaded.

    Therefore i’ve added some logs to understand the exact time and found out that the WPMU site was causing this. I already cleaned/removed faulty plugins, i have just a few plugins left which don’t change many things.

    I’ve found the 1 minute interval where the load gets very high and i found out from mysql binlogs that wordpress was launching many wp_cron at that time, as i see many updates of the cron and _transient_doing_cron of each blog, and many updates of the _site_transient_update_core of the network.

    I saw that there were some topics about wp-cron making their server overloaded, however many are old or incomplete.

    I think there’s somehow a bug in wordpress which makes this wp-cron go in loop or something but it’s not an easy task to dig into this problem.

    Any feedback or help appreciated!

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