[Beowulf] Really efficient MPIs??

[Charlie Peck]

On Nov 28, 2007, at 12:31 AM, amjad ali wrote:

> Hello,
>
> Because today the clusters with multicore nodes are quite common  
> and the cores within a node share memory.
>
> Which Implementations of MPI (no matter commercial or free), make  
> automatic and efficient use of shared memory for message passing  
> within a node. (means which MPI librarries auomatically communicate  
> over shared memory instead of interconnect on the same node).

Our fairly basic tests showed that LAM-MPI is measurably more  
efficient than other MPI implementations when the architecture  
includes a mix of both intra-node and inter-node communication  
paths.  The tests were all done over gigabit ethernet.

charlie