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We have several web servers running on Amazon (ec2) c1.xlarge, over Amazon AMI. The servers are duplicates of each other, running the exact same hardware and software. Each server spec ...
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  1. #1
    Oz.
    Oz. is offline
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    Question No apparent reason for high load average


    We have several web servers running on Amazon (ec2) c1.xlarge, over Amazon AMI.

    The servers are duplicates of each other, running the exact same hardware and software.
    Each server spec is:
    7 GB of memory
    20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
    1690 GB of instance storage
    64-bit platform
    I/O Performance: High
    API name: c1.xlarge

    A couple of weeks ago we have run a yum upgrade on one of the servers. Starting on this upgrade the upgraded server started showing a high load average.
    Needless to say, we did not update the other servers and we can not do so until we understand the reason for this behavior.

    The strange thing is that when we compare the servers using top or iostat, we can not find the reason for the high load.
    Note that we have moved traffic from the "problematic" server to the others, which have made the "problematic" server less crowded in terms of requests, and still his load is higher.

    Do you have any idea what could it be, or where else can we check?
    Many thanks for the help!
    Oz.

    HTML Code:
    #
    # proper server
    # w command
    #
     00:42:26 up 2 days, 19:54,  2 users,  load average: 0.41, 0.48, 0.49
    USER     TTY      FROM              LOGIN   IDLE   JCPU   PCPU WHAT
    	  pts/1    82.80.137.29     00:28   14:05   0.01s  0.01s -bash
      	  pts/2    82.80.137.29     00:38    0.00s  0.02s  0.00s w
    
    
    #
    # proper server
    # iostat command
    #
    Linux 3.2.12-3.2.4.amzn1.x86_64   _x86_64_        (8 CPU)
    
    avg-cpu:  %user   %nice %system %iowait  %steal   %idle
               9.03    0.02    4.26    0.17    0.13   86.39
    
    Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
    xvdap1            1.63         1.50        55.00     367236   13444008
    xvdfp1            4.41        45.93        70.48   11227226   17228552
    xvdfp2            2.61         2.01        59.81     491890   14620104
    xvdfp3            8.16        14.47        94.23    3536522   23034376
    xvdfp4            0.98         0.79        45.86     192818   11209784
    
    
    #
    # problematic server
    # w command
    #
     00:43:26 up 2 days, 21:52,  2 users,  load average: 1.35, 1.10, 1.17
    USER     TTY      FROM              LOGIN   IDLE   JCPU   PCPU WHAT
    	  pts/0    82.80.137.29     00:28   15:04   0.02s  0.02s -bash
    	  pts/1    82.80.137.29     00:38    0.00s  0.05s  0.00s w
    
    
    #
    # problematic server
    # iostat command
    #
    Linux 3.2.20-1.29.6.amzn1.x86_64          _x86_64_        (8 CPU)
    
    avg-cpu:  %user   %nice %system %iowait  %steal   %idle
               7.97    0.04    3.43    0.19    0.07   88.30
    
    Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
    xvdap1            2.10         1.49        76.54     374660   19253592
    xvdfp1            5.64        40.98        85.92   10308946   21612112
    xvdfp2            3.97         4.32        93.18    1087090   23439488
    xvdfp3           10.87        30.30       115.14    7622474   28961720
    xvdfp4            1.12         0.28        65.54      71034   16487112

  2. #2
    Linux User Krendoshazin's Avatar
    Join Date
    Feb 2005
    Location
    London, England
    Posts
    471
    Try using top to see the list of processes in the system with their CPU and RAM usages. It's an ncurses based program that updates itself, and so it's more useful for real-time debugging.

  3. #3
    Oz.
    Oz. is offline
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    Yes we tried but there is nothing strange running processes, we made a new machine and connected the HDD to him and we got the same problem.
    What else could it be?
    Thanks

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