One important thing is if you're not going to put 4 processors per
node (which isn't worth it in my experience), then turn hyperthreading
off. If you don't, then depending on the scheduler you may get two
processes scheduled on the same logical processor, which is a huge
performance loss.
On Thu, 24 Jun 2004 15:59:19 -0500, Luke Palmer <lop_at_[hidden]> wrote:
>
> Hi everyone,
>
> I have a conceptual question. All my nodes are dual Xeon, which appear
> to have four logical processors each due to hyperthreading. Would there
> be any advantage to starting four lam processes per node, rather than
> two, or is this just silly?
>
> Let me know what you think.
>
> Thanks
> -Luke
>
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