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This paper describesCOLTHPF, a run-time support specifically designed for the co-ordination of concurrent and communicating HPF tasks.COLTHPF is implemented on top of MPI and requires only small changes to the run-time support of the HPF compiler used. Although the COLTHPF API can be used directly by programmers to write applications as a flat collection of interacting data-parallel tasks, we believe that it can be used more productively through a compiler of a simple high-level co-ordination languagewhich facilitates programmers in structuring a set of data-parallel HPF tasks according to common forms oftask-parallelism. The paper outlines design and implementation issues, and discusses the main differences from other approaches to exploiting task parallelism in the HPF framework. We show how COLTHPF can be used to implement common forms of parallelism, e.g. pipeline and processor farms, and we present experimental results regarding both synthetic micro-benchmarks and sample applications. The experiments were conducted on an SGI/Cray T3E using Adaptor, a public domain HPF compiler. Copyright  1999 John Wiley & Sons, Ltd.

COLTHPF, a run-time support for the high-level co-ordination of HPF tasks