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  • Resolved theblindmonk


    Hi all,

    I have a highly customized wordpress theme running 2 amazon aws ec2 micro servers using a load balancer. I notice after i browse the site around for about 5 – 10 minutes(or say around 50 clicks) the memory of the servers reach full(~600mb) on each server.
    apache 2 threads take up about 10mb each. This happens everytime i restart the server(which starts with around 450mb free and quickly fills up). Once it reaches it’s peak, any new requests are handled really slow.

    I have turned off swapping but have enabled memcache and apc opcode. I’m also using w3ctotal cache.

    I’m not sure where the problem lies:
    – Is it possible that there is a memory leak?
    On my localhost testing, i never run out of memory or server never crashes.
    – Is it likely some server setting in apache is wrong on mine?
    – Combination of above two?

    I’m not sure why the memory never falls down at all, shouldn’t the thread handling a request release memory after the timeout period?

    I know this is a lot of questions, but i’m really looking for any help on how to optimize the site better.

    Thanks for any help!

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  • On my localhost testing, i never run out of memory or server never crashes.

    U think this indicates that it is not a WordPress issue…since it appears not to be, you should consult server forums as applicable…

    Thanks Seacoast! Yes it does appear to be my server settings and not specific to wordpress. After searching and tweaking around a bit, i think i have found a much better server configuration which releases memory once the client is not active on the website or closes the tab.

    For anyone interested, my server settings under /etc/apache2/apache2.conf is as below. Essentially reduced the amount of keepalive time.

    # Timeout: The number of seconds before receives and sends time out.
    Timeout 40
    # KeepAlive: Whether or not to allow persistent connections (more than
    # one request per connection). Set to "Off" to deactivate.
    KeepAlive On
    # MaxKeepAliveRequests: The maximum number of requests to allow
    # during a persistent connection. Set to 0 to allow an unlimited amount.
    # We recommend you leave this number high, for maximum performance.
    MaxKeepAliveRequests 50
    # KeepAliveTimeout: Number of seconds to wait for the next request from the
    # same client on the same connection.
    KeepAliveTimeout 2
    ## Server-Pool Size Regulation (MPM specific)
    # prefork MPM
    # StartServers: number of server processes to start
    # MinSpareServers: minimum number of server processes which are kept spare
    # MaxSpareServers: maximum number of server processes which are kept spare
    # MaxClients: maximum number of server processes allowed to start
    # MaxRequestsPerChild: maximum number of requests a server process serves
    <IfModule mpm_prefork_module>
        StartServers          5
        MinSpareServers       3
        MaxSpareServers      5
        MaxClients           13
        MaxRequestsPerChild  1000
Viewing 2 replies - 1 through 2 (of 2 total)
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