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  1. #1
    Join Date
    Oct 2002
    Location
    Virginia
    Posts
    788

    diagnosing a "lag", help please

    what else should I look for with this problem, in the last 3-4 weeks I have experienced "lag" with my forums, users will get time outs, a page will load and say “done” but there is nothing on the page, pages will start to load, hang up, then finish loading 10-30 seconds later, a user will get a “done” page that’s blank and have to refresh and it will then load right away, etc this happens on two different sites, two different forum software, so I assume its server related

    at first I thought it was network related, but after my server co contacted the NOC they said it was apache related, the logs have been hitting the 2GB limit and bringing the server down, after a week/week ˝ the 2GB limit would be reached again, so logrotate was installed, this helped the server from crashing but it was still slow, same “lags”

    Contacted another management co, some apache settings were tweaked, some php settings tweaked and logs temporarily disabled, the forums are now much faster but the “lag” symtoms are still there, they just go by quicker, pages still “hang”, just not as long

    Where do I go from here to diagnose this? The server itself seems to be running ok, no big loads, idle time is good, pings are low, memory is not completely maxed out, apc cache is installed, mysql and php tweaked by a mangement co and recommendations at vB.com

    Server
    AMD Barton 3000
    1GB RAM
    80GB SATA main (approx. 35% used)
    40GB SATA backup (approx 35% used)
    bandwidth not a problem
    vB forum
    15,000 members
    1.2 million posts
    (100-500 online)
    IPB forum
    3000 members
    300,000 posts
    (25-150 online)
    TOP
    20:41:28 up 35 days, 23:13, 1 user, load average: 0.37, 0.67, 0.85
    120 processes: 118 sleeping, 1 running, 1 zombie, 0 stopped
    CPU states: cpu user nice system irq softirq iowait idle
    total 0.0% 25.9% 1.5% 0.0% 0.3% 9.1% 62.8%
    Mem: 1020776k av, 993080k used, 27696k free, 0k shrd, 14148k buff
    784716k active, 168144k inactive
    Swap: 1052248k av, 17236k used, 1035012k free 527240k cached
    Tracert (my IP removed)
    1 <1 ms <1 ms <1 ms 192.168.0.1
    2 15 ms 15 ms 15 ms 10.30.1.1
    3 16 ms 15 ms 16 ms so-1-1-0-0.CORE-RTR1.ROA.verizon-gni.net [130.81.11.33]
    4 24 ms 23 ms 24 ms so-2-1-3-0.BB-RTR1.RES.verizon-gni.net [130.81.20.0]
    5 20 ms 21 ms 21 ms so-6-0-0-0.ASH-PEER-RTR2.verizon-gni.net[130.81.17.177]
    6 21 ms 23 ms 23 ms 0.so-7-0-0.XL2.IAD8.ALTER.NET [152.63.36.205]
    7 22 ms 23 ms 23 ms 0.so-0-1-0.XL2.DCA5.ALTER.NET [152.63.32.33]
    8 24 ms 22 ms 31 ms 0.so-7-0-0.BR1.DCA5.ALTER.NET [152.63.43.177]
    9 25 ms 23 ms 24 ms cpr1-pos-6-2.VirginiaEquinix.savvis.net [208.173.10.137]
    10 24 ms 26 ms 26 ms bcs2-so-5-3-0.washington.savvis.net [206.24.227.45]
    11 43 ms 43 ms 44 ms dcr2-so-7-2-0.Atlanta.savvis.net [204.70.192.57]
    12 61 ms 63 ms 61 ms dcr2-so-2-0-0.dallas.savvis.net [204.70.192.70]
    13 60 ms 62 ms 62 ms bhr1-pos-1-0.fortworthda1.savvis.net [208.172.129.230]
    14 63 ms 63 ms 64 ms bhr1-pos-12-0.fortworthda1.savvis.net [208.172.131.82]
    15 61 ms 60 ms 62 ms csr1-ve242.fortworthda1.savvis.net [216.39.64.58]
    16 * * 62 ms 216.39.86.190
    17 63 ms * * (my IP removed)
    18 64 ms 62 ms 66 ms (my IP removed)

    thanks in advance for any and all help!
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  2. #2
    Join Date
    Oct 2005
    Location
    US
    Posts
    308
    Have you looked at the MaxClients setting for Apache?

    (You can check error logs for it. (If your hitting it))

    (Over 256 requires recompile.)

  3. #3
    Join Date
    Dec 2004
    Location
    New York, NY
    Posts
    10,710

    (Over 256 requires recompile.)
    Actually, I believe you can just set "ServerLimit" to whatever you would like it to be in httpd.conf. Recompile shouldn't be necessary.

  4. #4
    Join Date
    Oct 2002
    Location
    Virginia
    Posts
    788
    Quote Originally Posted by No1Resource
    Have you looked at the MaxClients setting for Apache?

    (You can check error logs for it. (If your hitting it))

    (Over 256 requires recompile.)

    maxclients shows its set at 2000


    Actually, I believe you can just set "ServerLimit" to whatever you would like it to be in httpd.conf.
    didnt find any mention of serverlimit in the httpd.conf ?
    UrlRedo.com - short URL service

  5. #5
    Join Date
    Dec 2004
    Location
    New York, NY
    Posts
    10,710
    didnt find any mention of serverlimit in the httpd.conf ?
    You can set it manually.

    http://httpd.apache.org/docs/2.0/mod...ml#serverlimit

  6. #6
    Join Date
    Oct 2002
    Location
    Virginia
    Posts
    788
    Quote Originally Posted by layer0
    so in command line i type ServerLimit <insert#here> ?????

    how do i find what serverlimit is currently set to? i do #whereis serverlimit and it just brings up the name
    UrlRedo.com - short URL service

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