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imapd using too much CPU

Discussion in 'General Discussion' started by cyrus, Feb 1, 2006.

  1. cyrus

    cyrus Member

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    Hi,

    I'm running WHM 10.8.0 cPanel 10.8.1-S114 (on FC2), there seems to be one user who's IMAP processes keep hogging all CPU resources. I ran /scripts/mailperm but no luck ... also checked his mailbox quotas but they were quite within their limits. Also upcp with and without --force didn't help ... neither did upgrading to the release version.

    Can someone please tell me what could be causing this problem ? This only seems to be happening with this particular user and i've checked the processes too, they are valid imapd daemons (no cloaked backdoors etc)


    Code:
    top - 01:47:00 up  3:26,  2 users,  load average: 9.06, 9.55, 9.78
    Tasks: 180 total,  15 running, 163 sleeping,   1 stopped,   1 zombie
    Cpu(s): 26.8% us, 59.0% sy,  0.0% ni,  2.0% id,  9.4% wa,  0.1% hi,  2.8% si
    Mem:   4154736k total,  3474112k used,   680624k free,   238972k buffers
    Swap:  4088532k total,        0k used,  4088532k free,  2350888k cached
    
      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    16985 foobar  18   0  2652 1172  852 R 80.7  0.0   9:34.19 imapd
    19516 foobar  18   0  2652 1108  816 R 77.2  0.0   5:15.08 imapd
    21706 foobar  18   0  2652 1108  816 R 76.6  0.0   1:22.91 imapd
    
    
    Thanks in advance,
    Cyrus

    P.S. I know converting to courier could help but sadly this server has > 500 acnts and would crawl to death if I run the conversion.. :(
     
  2. chirpy

    chirpy Well-Known Member

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    Looks like those are looping processes (from the execution time). I'd suggest killing them off and restarting xinetd. As you say, converting to courier-imap would probably fix it.
     
  3. bymarchi

    bymarchi Active Member

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    Hi Chirpy,
    I also have this problem.
    When my server load is high, I stop courier-imap and the load goes down immediately.
    Do you know what you can be happening?

    Thank you.
     
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