First Experiences with Intel Cluster OpenMP

Christian Terboven, Dieter an Mey, Dirk Schmidl and Marcus Wagner

International Workshop on OpenMP (IWOMP 2008)
Purdue University, West Lafayette, IN, USA, May 12th - May 14th 2008

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Summary

Intel Cluster OpenMP (ClOMP) is the first commercially available OpenMP implementation for a cluster and allows shared-memory OpenMP programs to be executed on a cluster. In this paper we present our first experiences with Intel Cluster OpenMP. ClOMP takes advantage of the relaxed consistency memory model of OpenMP. Nevertheless, OpenMP primitives get two to four orders of magnitudes more expensive. Intel Cluster OpenMP proved to be successful for several small applications and while preserving the easier and more comfortable parallelization paradigm of OpenMP and shared-memory, a cluster of SMP nodes could be exploited. But for more complex applications like PANTA, scalability does not come for free and further tuning has to be invested.

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