Can IIS utilise multiple CPU cores?

Posted on 2007-09-30
Last Modified: 2008-01-09
Title says it all really - Is it worth specifying a quad core cpu for a dedicated web server or will the additional 3 cores lie dormant? The OS will be windows server 2003 Standard or SBS 2003, haven't decided yet. Can IIS use multiple CPU cores or will it only use one?
Question by:Jim Jones
    LVL 7

    Expert Comment

    IIS does not know how to direct operations to a specific CPU.
    Maby in server 2008...

    Author Comment

    by:Jim Jones
    So there's no benefit to having even a dual core CPU instead of a single core one for a web server?
    LVL 7

    Expert Comment

    It's not percise.
    The OS can use benefits from a multiple CPU topology by balancing transactions between CPUs.
    Dual core CPU has also advantages such as hier performance and less heating.
    LVL 14

    Accepted Solution

    IIS will load balance across all CPUs - so yes there is absolutely a benefit to having multiple CPUs - although remember that two faster processors are going to get the job done faster than 4 slower cores, but 4 slower cores can get twice as much work done... so it depends on your app.  IIS doesn't do it directly, it just launches a new process to handle what ever script you have and the OS handles where it runs.  But thats probably what you want - if not you can tweak it using application pools:

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