[mvapich-discuss] Significance of process 0 in MPI operation.

[Krishna Chaitanya Kandalla]

Neha,
         The role played by a particular process in an MPI collective 
communication operation depends on the nature of the algorithm that is 
used. You can probably go over the MPI standard and some of the related 
publications to learn more about these operations and the associated 
algorithms.  If you are interested in Alltoall in particular, we choose 
between three algorithms, depending on the message size and the system 
size.  But, in any case, the received buffers shouldnt get clobbered. 
Can you please share your code with us?

Thanks,
Krishna

neha bhagat wrote:
> Hi,
>
> I have implemented MPI_ALLtoAll() call and am testing it on 4 nodes 64 
> processes .
> However it is observed that the data from Process 0 gets overwritten 
> on received buffers of other processes at same location.
>
> So .What is the role of Process 0 in MPI communication?
>
> Thanks & regards,
> Neha
>
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