[OMPI users] maximising bandwidth

[Toon Knapen]

Hi all,

If I have a master-process that needs to send a chunk of (different) 
data to each of my N slave processes as fast as possible, would I 
receive the chunk in each of the slaves faster if the master would 
launch N threads each doing a blocking send or would it be better to 
launch N nonblocking sends in the master.

I'm currently using OpenMPI on ethernet but might the approach be 
different with different types of networks ?

thanks in advance,

toon