taking advantage of hyperthreading?

This is a discussion on taking advantage of hyperthreading? within the A Brief History of Cprogramming.com forums, part of the Community Boards category; Hi folks, My research involves processes that take upto 6 days to complete on one machine with a 1.7 ghz ...

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    Linguistic Engineer... doubleanti's Avatar
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    taking advantage of hyperthreading?

    Hi folks,

    My research involves processes that take upto 6 days to complete on one machine with a 1.7 ghz chip and a gig and a half of ram, and it's CPU bound. So, I don't like waiting that long when you have weekly research meetings, and I split up the job to run amongst a few machines of roughly the same caliber.

    I have a 3 ghz p4 with hyperthreading and I'm all using java for this. So to take advantage of it, I suppose I would have to make my program multithreaded? Does anyone know where I can get some info on this? Or have any suggestions? Thanks.

    -da
    hasafraggin shizigishin oppashigger...

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    Quote Originally Posted by doubleanti
    Hi folks,

    My research involves processes that take upto 6 days to complete on one machine with a 1.7 ghz chip and a gig and a half of ram, and it's CPU bound. So, I don't like waiting that long when you have weekly research meetings, and I split up the job to run amongst a few machines of roughly the same caliber.

    I have a 3 ghz p4 with hyperthreading and I'm all using java for this. So to take advantage of it, I suppose I would have to make my program multithreaded? Does anyone know where I can get some info on this? Or have any suggestions? Thanks.

    -da
    Yes -- if it's only one program that you use. If it's several programs, the OS will do the multithreading. Java mutlthreading? http://www-128.ibm.com/developerwork.../j-thread.html

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    and the hat of wrongness Salem's Avatar
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    > I split up the job to run amongst a few machines of roughly the same caliber.
    Running two instances of this program on your HT machine should take advantage of the processor features.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Yes, my avatar is stolen anonytmouse's Avatar
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    It's worth pointing out that, in some circumstances, hyperthreading can result in a performance hit rather than a boost.

    http://blogs.msdn.com/oldnewthing/ar...16/504659.aspx (in comments)
    http://msdn.microsoft.com/msdnmag/is...g/default.aspx

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    Linguistic Engineer... doubleanti's Avatar
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    Alright great, that explains why it sped up (almost roughly double, which makes me wonder...) when I ran two in parallel, and also relieves me that I won't have to actually multithread it, for now... Thanks guys!
    hasafraggin shizigishin oppashigger...

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