Hi,
This might be a stupid question but anyway : are you running on
a multiprocessor ?. Otherwise what you get is exactly what should
be expected.
Bye. Roberto.
On Mon, 29 Mar 2004, Ming Wu wrote:
> Hi,
>
> I assigned multiple processes on one machine instead of several machines.
> In this way, I expect the communication cost will be reduced compared
> with assigning them to several machines. However, the result is weird.
> both computation cost and communication cost are increased sharply,
> especially MPI_Reduce, MPI_Sendrecv. It seems that the underlying
> implementation of lam_mpi doesn't favor multiple processes on the same
> host.
>
> Your help will be greatly appreciated.
>
> thanks
>
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