Introduction

Open Computing Language (OpenCL) is a programming model for heterogeneous parallel computing systems. OpenCL provides a common abstraction layer across different multicore architectures, such as CPUs, GPUs, Intel Xeon Phi Coprocessors, FPGAs, DSPs, and Cell BE processors. Programmers can write an OpenCL application once and run it on any OpenCL-compliant system. However, current OpenCL is restricted to a single heterogeneous system. To target heterogeneous CPU/GPU clusters, programmers must use the OpenCL framework combining with a communication library, such as MPI. The same thing is true for CUDA.

SnuCL is an OpenCL framework and freely available, open-source software developed at Seoul National University. It naturally extends the original OpenCL semantics to the heterogeneous cluster environment. The target cluster consists of a single host node and multiple compute nodes. They are connected by an interconnection network, such as Gigabit and InfiniBand switches. The host node contains multiple CPU cores and each compute node consists of multiple CPU cores and multiple GPUs. For such clusters, SnuCL provides an illusion of a single heterogeneous system for the programmer. A GPU, an Intel Xeon Phi Coprocessor, or a set of CPU cores becomes an OpenCL compute device. SnuCL allows the application to utilize compute devices in a compute node as if they were in the host node. Thus, with SnuCL, OpenCL applications written for a single heterogeneous system with multiple OpenCL compute devices can run on the cluster without any modifications.

In addition, SnuCL integrates multiple OpenCL platforms from different vendor implementations into a single platform. It enables OpenCL applications to share objects (buffers, events, etc.) between compute devices of different vendors. As a result, SnuCL achieves both high performance and ease of programming in both a single system and a heterogeneous cluster system.

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/*   Center for Manycore Programming                                         */
/*   Department of Computer Science and Engineering                          */
/*   Seoul National University, Seoul 08826, Korea                           */
/*   http://aces.snu.ac.kr                                                   */
/*                                                                           */
/* Contributors:                                                             */
/*   Jungwon Kim, Sangmin Seo, Gangwon Jo, Jun Lee, Jeongho Nah,             */
/*   Jungho Park, Junghyun Kim, and Jaejin Lee                               */
/*                                                                           */
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Copyrights and Licenses for Third Party Software Distributed with SnuCL:
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The SnuCL software contains code written by third parties. Such software will
have its own individual LICENSE.TXT file in the directory in which it appears.
This file will describe the copyrights, license, and restrictions which apply
to that code.