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Asked: 2026-05-15T08:12:54+00:00

I am doing some expensive caluations right now. It is one programm, which I

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I am doing some expensive caluations right now. It is one programm, which I run several instances of at the same time. I am running them under linux on a machine with 4 cpus with 6 cores each. The cpus are Intel Xeon X5660, which support hyper thearting. (That’s some insane hardware, huh?) Right now I am running 24 processes at once. Would it be better to run more, b/c of HT ?

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  1. Editorial Team

    Measuring first is a good idea, but you can also consider following:

    • If the processes may block (particulary on IO), more of them is probably better.
    • If the processes do a lot of math most of their time, you may take advantage of HyperThreading with more processes.
    • On the other hand, if the processes have any shared state (memory or files), too much of them will increase contention and cache thrashing.
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