4 Replies Latest reply: Oct 17, 2012 1:26 AM by Dude! RSS

    OEL LOAD AVERAGE IS HIGH

    773757
      Hi All,
      Our Oracle application(R12.1.3) runs on OEL 5.4 64bit.When i issue top command is output is as follows.
      top - 17:56:39 up 17 days, 21:38, 1 user, load average: 432.02, 431.64, 431.27
      Tasks: 2846 total, 1 running, 2838 sleeping, 7 stopped, 0 zombie
      Cpu(s): 0.9%us, 2.3%sy, 0.0%ni, 95.9%id, 0.8%wa, 0.0%hi, 0.0%si, 0.0%st
      Mem: 32469740k total, 32384880k used, 84860k free, 1471120k buffers
      Swap: 67111496k total, 108736k used, 67002760k free, 22862096k cached


      From the above output it seems that CPU is fine and we have no problem regarding the performance of the application .However my concern is load average .It is showing every high values .
      load average: 432.02, 431.64, 431.27

      How should i troubleshoot load average to normal.

      Below is my Server CPU info

      processor : 0
      vendor_id : GenuineIntel
      cpu family : 6
      model : 44
      model name : Intel(R) Xeon(R) CPU E5649 @ 2.53GHz
      stepping : 2
      cpu MHz : 1596.000
      cache size : 12288 KB
      physical id : 0
      siblings : 1
      core id : 0
      cpu cores : 1
      fpu : yes
      fpu_exception : yes
      cpuid level : 11
      wp : yes
      flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx smx est tm2 cx16 xtpr lahf_lm
      bogomips : 6336.51
      clflush size : 64
      cache_alignment : 64
      address sizes : 40 bits physical, 48 bits virtual
      power management:


      Please Guide me to bring load average below normal.


      Thanks
      Chowdary
        • 1. Re: OEL LOAD AVERAGE IS HIGH
          Dude!
          First of all, you need to understand what load average is. The load average values in top are the 1 , 5 and 15 minute load average intervals. Average load is not to be confused with CPU percentage. Load average measures all demand for CPU during a certain period of time, not just what was active. In a perfect scenario, average load matches the number of CPU's. If there is one CPU in the system and the 1 minute load average is 1.00, then the machine was 100 % busy and no process had to wait.

          There is no way to make any suggestion based on your top output to determine what needs to be done to optimize your system usage. You need to analyze the Database to draw any conclusions about what is causing the high load.
          • 2. Re: OEL LOAD AVERAGE IS HIGH
            Johan Louwers
            Question is..... Even thought you notice the numbers as shown above... What is the user experience when working on the system... Donyou have performance issues and how are they showing?

            Regards,
            Johan Louwers.
            • 3. Re: OEL LOAD AVERAGE IS HIGH
              773757
              Well there is no perfomance issues with the application and database.Do i need to restart the server once.
              • 4. Re: OEL LOAD AVERAGE IS HIGH
                Dude!
                Check the following:

                http://en.wikipedia.org/wiki/Load_%28computing%29
                http://www.thegeekstuff.com/2011/03/sar-examples/

                Try other commands like "uptime" and compare the output.