15294

A framework for efficient execution on GPU and CPU+GPU systems

Jean-Francois Dollinger
Universite de Strasbourg
tel-01251719, (06 January 2016)
@phdthesis{dollinger2015framework,

   title={A framework for efficient execution on GPU and CPU+ GPU systems},

   author={Dollinger, Jean-Fran{c{c}}ois},

   year={2015},

   school={Universit{‘e} de Strasbourg}

}

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Technological limitations faced by the semi-conductor manufacturers in the early 2000’s restricted the increase in performance of the sequential computation units. Nowadays, the trend is to increase the number of processor cores per socket and to progressively use the GPU cards for highly parallel computations. Complexity of the recent architectures makes it difficult to statically predict the performance of a program. We describe a reliable and accurate parallel loop nests execution time prediction method on GPUs based on three stages: static code generation, offline profiling, and online prediction. In addition, we present two techniques to fully exploit the computing resources at disposal on a system. The first technique consists in jointly using CPU and GPU for executing a code. In order to achieve higher performance, it is mandatory to consider load balance, in particular by predicting execution time. The runtime uses the profiling results and the scheduler computes the execution times and adjusts the load distributed to the processors. The second technique, puts CPU and GPU in a competition: instances of the considered code are simultaneously executed on CPU and GPU. The winner of the competition notifies its completion to the other instance, implying the termination of the latter.
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