[ Sorry for the late reply... ]
On Tue, 3 Jul 2007, Maureen O Flynn wrote:
> I am doing a research project to investigate the causes of
> congestion in collective communications MPI_Gather and reduce
> operations, and so am looking into how socket size may affect
> performance in particular. I understand normally most users are not
> to do this when using LAM
This suggests to me that you want to use LAM/MPI's own implementation
of MPI_Gather and modify LAM/MPI library code to make it match your
requirements. This is indeed something that most LAM/MPI users don't
do...
> sock = socket( PF_INET, SOCK_STREAM, 0 );
... but if you create in your own MPI program a different socket, then
how do you expect to:
1. communicate using the LAM/MPI functions over your socket ?
2. have options set on your socket affect LAM/MPI's socket ?
While you explained a bit more about your project, you still didn't
answer my question related to whether this is a LAM/MPI library
development or your own program which just uses the LAM/MPI library.
--
Bogdan Costescu
IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu_at_[hidden]
|
