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Subject: [OMPI users] Message compression in OpenMPI
From: Tomas Ukkonen (tomas.ukkonen_at_[hidden])
Date: 2008-04-22 09:03:58


Hello

I read from somewhere that OpenMPI supports
some kind of data compression but I couldn't find
any information about it.

Is this true and how it can be used?

Does anyone have any experiences about using it?

Is it possible to use compression in just some
subset of communications (communicator
specific compression settings)?

In our MPI application we are transferring large
amounts of sparse/redundant data that compresses
very well. Also my initial tests showed significant
improvements in performance.

There are also articles that suggest that compression
should be used [1].

[1] J. Ke, M. Burtcher and E. Speight.
Runtime Compression of MPI Messages to Improve the
Performance and Scalability of Parallel Applications.

Thanks in advance,
Tomas