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From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On
Behalf Of Pavel Mezentsev
Sent: Monday, September 24, 2012 3:09 PM
To: Open MPI Users
Subject: Re: [OMPI users] Algorithms used in MPI_
Hello,
Are you making these rules manually or in some automated way?
Regards, Pavel Mezentsev.
2012/9/21 Iliev, Hristo
> Hi,
>
> Open MPI uses several different algorithms depending on which module from
> the "coll" framework is selected to perform the logic of the broadcast
> operation. The "
Hi,
Open MPI uses several different algorithms depending on which module from
the "coll" framework is selected to perform the logic of the broadcast
operation. The "tuned" module which usually gets selected on cluster
installations uses a heuristic rule, based on the message size and the size
of t
More or less. Open MPI supports 6 algorithms: basic linear, chain, pipeline,
split binary tree, binary tree, binomial tree.
The decision to switch between them is somehow similar to what you describe for
MPICH but more complex it depends on the number of nodes in the communicator
and the size o
