• Resolved drazon

    (@drazon)


    I noticed high cpu usage in 1 dedicated and 1 vps server both of them host more than 10 websites and (almost) all websites presented the high cpu usage issue with ao_speedup_cachebuster. I read the forums that it may have to do with memcache or something related.

    What I can say for now is that on both servers (both on WHM/cPanel CentosOS 6 latest) this appeared after yum update and server reboot. So far I have excluded the linux kernel. I have to check/debug all other stuff which got updated during the last yum update.

    Another thing I can say is that Super Cache can’t cache neither can preload the cache. If anybody has the same issues please share your feedback.

    I don’t think it’s an autoptimize issue it worked perfectly fine just before the yum update, however I’m posting this here to collect information from others that might experiencing the same issues.

Viewing 7 replies - 1 through 7 (of 7 total)
  • Plugin Author Optimizing Matters

    (@optimizingmatters)

    typically the cache-buster requests are done upon the cache being purged, which _should_ not be often. there are however plugins and one much used premium theme which call AO’s cache purge very regularly, which can cause issues. AO 2.5 (likely to be released this weekend) will prevent the cache-buster to be called too regularly (max once per 10 minutes), so that should limit the impact somewhat.

    pretty weird wp super cache doesn’t work any more either, filesystem permission problems maybe?

    Thread Starter drazon

    (@drazon)

    I know Frank, I read the forums and your feedback is much appreciated. I ‘m sure I’m going to have some news in the next few hours, I’m pretty sure also autoptimize and Super Cache have nothing to do with the source of the problem. I use both of them on every setup. I’m examining crons now and I think I might have found something. I’ll update this again soon.

    Thread Starter drazon

    (@drazon)

    Good day, I found the source of the problem here, The same day with the yum update I did, I checked if there were any plugins updated as well because I confirmed that it didn’t happen on all websites.

    The most common suspects in this case are security plugins, in my case I noticed that one security plugin “WP hide & security enhancer” got updated the same day. I looked at the changelog and I saw that it had wp cron related updates. Something caused the same crons to be fired multiple times. I disabled all 3 plugins AO SC and WP hide, reactivated them, I made sure to recreate the rewrite rules of the WP hide again and flushed all caches. Now all websites are up running again.

    Look if you have the same plugin installed or any other security plugins. Look which plugins got updated the same day. If that doesn’t help try to test a fresh WP install with AO and Super Cache only to see if there are any issues. As I initially thought AO and SC didn’t cause any issues.

    Plugin Author Optimizing Matters

    (@optimizingmatters)

    That’s real interesting feedback, thanks @drazon !

    Plugin Author Optimizing Matters

    (@optimizingmatters)

    this problem is caused by problems with the “wp hide” update, see https://ww.wp.xz.cn/support/topic/ao_speed_cachebuster-high-cpu-usage-and-multiple-requests/#post-11441511 for info on how @drazon was able to fix @akiraanastasia

    AO 2.5 (out in a couple of hours) will limit the impact somewhat as well (by not allowing the cache-buster logic to run more then 1 every 10 minutes).

    frank

    Hey everyone, i’am the developer for WP Hide plugin.
    So far i was not able to replicate the issue on this side, can you share more details regarding the plugins set-up?
    For WP Hide, at Rewrite > Root Files > Block wp-cron.php which is the selection you used? Changing that, does makes any change?

    Thanks

    Plugin Author Optimizing Matters

    (@optimizingmatters)

    thanks for dropping by @tdgu! let me tag @bofslime and @drazon as they were able to solve/ workaround the issue.

Viewing 7 replies - 1 through 7 (of 7 total)

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