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  1. #1
    Join Date
    Jun 2001

    Load Averages Help

    Hey guys,

    I was wondering, what is the acceptable load averages for a dual and quad processor Redhat 7.2 server?

    In single processor, a load average of under 1 is always good.
    Does that mean if you have dual cpus? the load average is good under 2?


  2. #2
    Join Date
    Jan 2002
    I used to help monitoring a dual cpu. That machine got DDoS attacks that the load average reached 100+.

    Anyway, the server worked fine at a load average of 6 or below.

    I'm not sure what is the recommended though.
    Ahmad Alhashemi
    PHP, Apache, C, Python, Perl, SQL
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  3. #3
    Join Date
    Jan 2002
    Scotland, UK
    We have been on a dual and all worked fine up until around the 5 or 6 mark, now we use singles but with far less sites and generally they are around the 0.05 - 0.1 mark, which works just great
    Chris Adams - CEO - Rochen Ltd. - chris (at) rochen (dot) com

    Now offering both US & UK premium business hosting, reseller hosting and managed virtualized services. | | | | Twitter: @rochenhost

  4. #4
    For a dual CPU (PIII) loads of about 5 are acceptable as websites come up without problem but above it they become very slow.

    For a single CPU WHM say 1.0 is good but we havent had problem for loads of arround 2.5


  5. #5
    Join Date
    Jul 2002
    The Big Easy -New Orleans
    In a way you're right.. load < #proc is best.

    Basically the load average is dependent on the process queue length. That is the number of processes waiting on the processor to run - this is different than the list of processes itself. On a xMP machine the next process switch that occurs the queue will go down by the number of processes (but if the running aren't done they go back).

    So a dual processing box, you shouldn't see any problem with a load up to 2. In the real world, it can go higher without problem - usually. It is dependent on the types of processes you're running. On a web server I would think you could get to 5,6 maybe even 8 at the extreme. Past that you're gonna see slow downs.

    I've seen loads of 12-14 on a single RISC box and it was still usable. It wasn't fast but it you could get what you needed to do done. But most tasks came in via terminals at 9.6kbps so it so it never was quick to begin with.

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