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  1. #1

    At what cpu load threshold do you upgrade?

    When you run "top" or "uptime"... What amount of average cpu load do you consider too high, and time for upgrading or adding another server?

    Yes, I realize there are a lot of other factors, but my question is specifically about cpu-load (preemptive strike against people not answering the direct question asked )

  2. #2
    I recommend you to monitor your server load with sar (sysstat). Do not leave your server with less than 50% CPU IDLE. If you want to have a good performance you need to upgrade when you reach 70-65% CPU IDLE.

    The load is not something you can use properly to decide if it is time to upgrade.

  3. #3
    Join Date
    Apr 2003
    Los Angeles, CA
    Quote Originally Posted by whlab
    The load is not something you can use properly to decide if it is time to upgrade.
    Right -- that box is doing just fine ... aside from a NFS issue which artificially increases the load:

    top - 07:47:54 up 8 days, 22:32, 2 users, load average: 259.24, 259.24, 259.1
    Tasks: 626 total, 1 running, 625 sleeping, 0 stopped, 0 zombie
    Cpu(s): 1.5% us, 0.5% sy, 0.0% ni, 92.0% id, 5.9% wa, 0.0% hi, 0.2% si
    Mem: 8312908k total, 7399484k used, 913424k free, 220608k buffers
    Swap: 8193108k total, 144k used, 8192964k free, 4844452k cached
    Pings <1 ms, Unlimited Transfer, Lowest Price: http://localhost/

  4. #4
    So the idle % listed in "top" is probably okay for determining that too?

  5. #5
    luki, lol.. what's that server doing ? Is the server responding on SSH and pages opening at all ? Just wondering...

    missilemike - yes, that's correct. But if you have load like 260 - then ask luki what to do I never had to deal with web hosting server with that kind of load.

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