[mpich-discuss] MPI how to support the smp machine?

[Dave Goodell]

What MPI implementation are you using?  If you are using MPICH2,  
please make sure that you are using the latest version (1.2.1).

-Dave

On Dec 4, 2009, at 3:02 AM, liaoyin wrote:

> I am runing the  HPL ( A Portable Implementation of the High- 
> Performance Linpack Benchmark for Distributed-Memory Computers) to  
> do linpcke test.
>
> I use the Atlas to as blas lib.
>
> My machine has  one cpu with four core.
>
> I run the mpirun -np 1 ./xhlp   the Gflops is 0.4  (one core to run)
>
> but  I run the mpirun -np 2  ./xhlp the Gflops is 0.04 (two core to  
> run)
>
> why is the two core is slower.
>
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