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Subject: Re: [OMPI users] Number of Sockets used by OpenMPI
From: George Bosilca (bosilca_at_[hidden])
Date: 2009-11-15 16:48:05

By default only one socket per peer per physical network is opened.
However, Open MPI has the possibility to open multiple socket per peer
per network, based on some experiments with the Playstation (where
having multiple socket allow for more bandwidth). The MCA parameter
that allows such behavior is btl_tcp_links.


On Nov 13, 2009, at 17:59 , Charles Salvia wrote:

> When using TCP, how many sockets does each process open per peer-
> process? Does each process open a single socket to connect to each
> peer-process, or does it use TWO sockets, one for sending, one for
> receiving?
> Thanks,
> -Charles Salvia
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