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Re: 'A' web server takes another "time out"

by samtregar (Abbot)
on May 03, 2006 at 18:58 UTC ( #547243=note: print w/replies, xml ) Need Help??


in reply to 'A' web server takes another "time out"

I don't have any guesses as to what's causing so many httpds, but perhaps you can fix it by changing your Apache configuration? It seems like a well-considered MaxClients could prevent this kind of explosion.

-sam

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Re^2: 'A' web server takes another "time out" (MaxClients)
by tye (Sage) on May 03, 2006 at 19:50 UTC

    Thanks for the pointer.

    It looks like I'd need read access to /usr/pair/apache/... in order to check that but I don't have it. An older copy of httpd.conf that I requested (before the upgrade) had MaxClients set to 100. I'll have to ask for a new copy...

    - tye        

      If PerlMonks is running under mod_perl you should able to use the Apache API to examine the current setting. You might even be able to dynamically change it!

      -sam

        If someone wants to take the time to be quite specific about how to check and/or set things like MaxClients and RLimitNPROC from mod_perl (or such), then I'll try them out. I did some looking but didn't come close to an answer in the short time I was able to devote to the search.

        Update: Corion reports looking into this and finding nothing useful for Apache1 (or at least that works on our web server).

        - tye        

Re^2: 'A' web server takes another "time out"
by mda2 (Hermit) on May 05, 2006 at 17:57 UTC
    On my experience, is very important correct values for:
    • MaxClient -> 100 Ok (it's can be more)
    • MinSpareServers -> min free instances, sugest same of StartServers
    • MaxSpareServers -> max free instances, sugest more than 60% of MaxClients
    • MaxKeepAliveRequests -> never all instances, sugest 50% of MaxClient
    • MaxRequestPerChild -> max request before kill process, set if required...

    Some time ago I had make a node Monitor instances of Apache Web server, with a script to see how are use of apache web connections online. To see historical usage, I'm sugest to use it or Apache-Tools (from Apache-Security).

    Evaluating your load averages, swap and CPU states, on my opinion optimize apache make good results... See your running time of httpd process:

    $ grep httpd 547234 | awk '{print $8}' | sort | uniq -c | head -n 5 125 0:00 110 0:01 41 0:02 14 0:03 9 0:04
    But the great info is "Parent Server Generation: XX" on server-status ... You realy need to enable this module ;)

    Current Time: Friday, 05-May-2006 10:56:47 PDT Restart Time: Tuesday, 02-May-2006 10:24:02 PDT Parent Server Generation: 3 Server uptime: 3 days 32 minutes 45 seconds Total accesses: 16557075 - Total Traffic: 349.2 GB CPU Usage: u170.547 s310.375 cu0 cs0 - .184% CPU load 63.4 requests/sec - 1.4 MB/second - 22.1 kB/request 175 requests currently being processed, 81 idle workers CKWWCKK_K_K_CKC_KK_K___KKK__K_KKKKKKKC_K_CC_KWK__WKKK_K_WKKK__WK GGG.GG.G.GGG...GGGGG..GGG.GGG.GG..GG.G..GG..G.....GWGGGGGGGGGGGG .G...W.GG.....G.GG.G..G.GG.........GGWG.G..G.G.....G...WG....G.G _K__KKCKCKWCK_WK__KKK_K_KW_KC__W___KKKK_KKKCK_KKWKKC_KCKKWKCKKWC

    --
    Marco Antonio
    Rio-PM

      MaxClients of 100 seems pretty high to me. Commodity hardward isn't going to deal with 100 simultaneous mod_perl jobs very well! Even if you have the memory to handle that many jobs, you probably don't have the CPU.

      MaxClients can be high on a front-end server which serves static content and does a reverse proxy to the mod_perl backend. Those servers do much less work per-request and a given machine can run more of them simultaneously.

      -sam

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