Toward OpenCL Automatic Multi-Device Support

Henry Sylvain, Alexandre Denis, Denis Barthou, Marie-Christine Counilh, Raymond Namyst
Exascale Computing Research Laboratory, France
Euro-Par (2014), hal-01005765, (13 June 2014)




   title={Toward OpenCL Automatic Multi-Device Support},

   author={Sylvain, Henry and Denis, Alexandre and Barthou, Denis and Counilh, Marie-Christine and Namyst, Raymond},


   affiliation={Exascale Computing Research Laboratory , Laboratoire Bordelais de Recherche en Informatique – LaBRI, RUNTIME – INRIA Bordeaux – Sud-Ouest},

   booktitle={Euro-Par 2014},


   address={Porto, Portugal},

   editor={Fernando Silva and Ines Dutra and Vitor Santos Costa},






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To fully tap into the potential of today heterogeneous machines, offloading parts of an application on accelerators is no longer sufficient. The real challenge is to build systems where the application would permanently spread across the entire machine, that is, where parallel tasks would be dynamically scheduled over the full set of available processing units. In this paper we present SOCL, an OpenCL implementation that improves and simplifies the programming experience on heterogeneous architectures. SOCL enables applications to dynamically dispatch computation kernels over processing devices so as to maximize their utilization. OpenCL applications can incrementally make use of light extensions to automatically schedule kernels in a controlled manner on multi-device architectures. We demonstrate the relevance of our approach by experimenting with several OpenCL applications on a range of heterogeneous architectures. We show that performance portability is enhanced by using SOCL extensions.
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