App and DB CPU going high even after using Page and Object cache

  • Resolved sujrara

    (@sujrara)


    5 years, 11 months ago

    We are using object cache and page cache in Redis.

    The default lifetime of cache objects: 180
    Garbage collection interval: 180

    Memory is shooting to 80% just for 4000 requests in 3 minutes.
    App server CPU reaches 100% in no time and response time is pathetic (more than 15secs). DB CPU also high on both master and slave.

    We have 14GB x 2 App server machines. For 1000 requests per min, it is a very high configuration. We do not think this could be an issue.

    Another thing we noticed just now:
    Since we are using fragment cache, we had enabled Late initialization. We disabled this and checked, performance has slightly improved. However, fragment cache stops working. Any thoughts on this?

    Couple of more questions:
    Could you please explain how W3TC cache plugin would behave when Cache is not ready for the page and more requests are hitting to same page?.
    Let us know where the plugin will put the requests on hold till the page gets cached or will allow all requests to go through default WP way and in background the cache will work?

    Pls help.

    • This topic was modified 5 years, 11 months ago by sujrara.

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  • Plugin Contributor Marko Vasiljevic

    (@vmarko)

    Hello @sujrara,

    You have contacted us via our support channel already. We are looking into this and we’ll reply back when we investigate.

    Thread Starter sujrara

    (@sujrara)

    @vmarko Thank you. We are really struggling from past couple of weeks with these issues. Need your good amount of attention. Thank you so much for being so helpful.

Viewing 2 replies - 1 through 2 (of 2 total)
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