MPI within SMP machines question

Patrick Geoffray patrick at
Mon Dec 3 09:55:29 PST 2001

Daniel Kidger wrote:

> One oddity is that on at least one motheboard we have tested, it is *faster*
> to go via the network card than get the processor to do the memory copy (!).

And usually the overlap is better because the CPU is computing instead of 
moving Bytes (and the cache is not messed up). Need good PCI though, the 
max bandwidth will be 1/2 of the PCI bandwidth.


|   Patrick Geoffray, Ph.D.      patrick at 
|   Myricom, Inc.      
|   Cell:  865-389-8852          685 Emory Valley Rd (B)
|   Phone: 865-425-0978          Oak Ridge, TN 37830

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