On Tue, Oct 12, 2004 at 10:58:48AM +0800, L WK wrote:
> I have bought a Dell with a P4 2.8G hyperthread CPU. I wonder if it's
>possible to make use of the hyperthread in my parallel program.
for sure.
mpirun h -c 2 program
you might get ~20% faster if you're lucky.
However if you have SMP (>1 cpu) and hyperthreading then you need the
kernel's cpu scheduler to be VERY hyperthreading aware, otherwise you
can get code _slowdowns_. Does anyone know if linux 2.6 kernels are
smart enough not to screw up yet?
cheers,
robin
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