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Main Title: libWater: heterogeneous distributed computing made easy
Author(s): Grasso, Ivan
Pellegrini, Simone
Cosenza, Biagio
Fahringer, Thomas
Type: Conference Object
Language Code: en
Abstract: Clusters of heterogeneous nodes composed of multi-core CPUs and GPUs are increasingly being used for High Performance Computing (HPC) due to the benefits in peak performance and energy efficiency. In order to fully harvest the computational capabilities of such architectures, application developers often employ a combination of different parallel programming paradigms (e.g. OpenCL, CUDA, MPI and OpenMP), also known in literature as hybrid programming, which makes application development very challenging. Furthermore, these languages offer limited support to orchestrate data and computations for heterogeneous systems. In this paper, we present libWater, a uniform approach for programming distributed heterogeneous computing systems. It consists of a simple interface, compliant with the OpenCL programming model, and a runtime system which extends the capabilities of OpenCL beyond single platforms and single compute nodes. libWater enhances the OpenCL event system by enabling inter-context and inter-node device synchronization. Furthermore, libWater's runtime system uses dependency information enforced by event synchronization to dynamically build a DAG of enqueued commands which enables a class of advanced runtime optimizations. The detection and optimization of collective communication patterns is an example which, as shown by experimental results, improves the efficiency of the libWater runtime system for several application codes.
Issue Date: 2013
Date Available: 26-Oct-2017
DDC Class: 004 Datenverarbeitung; Informatik
Subject(s): distributed computing
heterogeneous computing
programming model
runtime system
Proceedings Title: Proceedings of the 27th International ACM Conference on International Conference on Supercomputing
Publisher: Association for Computing Machinery (ACM)
Publisher Place: New York, NY
Publisher DOI: 10.1145/2464996.2465008
Page Start: 161
Page End: 172
ISBN: 978-1-4503-2130-3
Appears in Collections:FG Architektur eingebetteter Systeme » Publications

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