[Beowulf] shared distributed memory ?

choy hau yan choyhauyan at yahoo.com
Thu Feb 26 00:51:24 EST 2004

I am a user for scyld beowulf cluster. I use mpi  for
parallel computing.I have some question:

> I got 2 processors that in shared memory and then
> connect with TCP/IP to another 2 processors in
> memory.
> I use mpisend/recv for communication, but why can't
> call this shared distributed memory?
> The speedup with this architecture is very low.why?
> speedup:
> 2 processor: 1.61
> 3 processor: 2.31
> 4 processor: 2.30
> actually with shared memory, the speedup is more
> that distributed becasue almost no cos communication
> in shared memory.right? Hope that some one can
answer my question. thanks..

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