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  1. #1
    Trying to find the bottleneck, is this IO issue?



    Quote:


    [~]# vmstat
    procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- -
    r b swpd free buff cache si so bi bo in cs us sy id wa st
    2 0 78964 298804 252632 1228020 0 1 124 196 2 4 19 4 76 2 0
    [~]# vmstat
    procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
    r b swpd free buff cache si so bi bo in cs us sy id wa st
    1 0 78964 298184 252648 1228084 0 1 124 196 2 4 19 4 76 2 0
    [~]# iostat
    Linux 2.6.18-92.el5 (server.net) 11/16/2008
    avg-cpu: %user %nice %system %iowait %steal %idle
    0.34 18.53 3.59 1.84 0.00 75.70
    Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
    sda 25.91 496.60 777.66 567980120 889443028
    dm-0 105.74 495.16 772.46 566336450 883492896
    dm-1 0.83 1.43 5.20 1640448 5950128


    Server has a 1.85 load. I am trying to find if its an IO issue or not.
    Any Linux tools that will help me find processes using up resources besides top? - It might be mysql as all invoked processes are PHP (suexec).





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  2. #2
    Besides top you can use the ps command, free command for memory





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  3. #3
    thedude76 Guest
    Also try iostat -xcnd 5





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    Last edited by thedude76 : 11-16-2008 at 11:25 AM.

  4. #4
    Don't look at the first record with the vmstat and iostat, let them settle. ~120 IOPS should be nothing for modern disks, but maybe it spikes in your case. Internet traffic is always fractal.

  5. #5
    hostbox
    >> tools that will help me find processes using up resources
    >> besides top?
    dstat is a good tool, small mem foot-print and very elaborate.
    Is the I/O wait state on top steady? Does it go down and then spike upwards?





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