Java for high performance computing: assessment of current research and practice
PPPJ '09 Proceedings of the 7th International Conference on Principles and Practice of Programming in Java
Multicore-enabling the MPJ express messaging library
Proceedings of the 8th International Conference on the Principles and Practice of Programming in Java
Design of efficient Java message-passing collectives on multi-core clusters
The Journal of Supercomputing
On the evaluation of java symphony for heterogeneous multi-core clusters
Euro-Par 2010 Proceedings of the 2010 conference on Parallel processing
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The need to increase performance while conserving energy lead to the emergence of multi-core processors. These processors provide a feasible option to improve performance of software applications by increasing the number of cores, instead of relying on increased clock speed of a single core. The uptake of multi-core processors by hardware vendors present variety of challenges to the software community. In this context, it is important that messaging libraries based on the Message Passing Interface (MPI) standard support efficient inter-core communication. Typically processing cores of today's commercial multi-core processors share the main memory. As a result, it is vital to develop devices to exploit this. MPJ Express is our implementation of the MPI-like Java bindings. The software has mainly supported communication with two devices; the first is based on Java New I/O (NIO) and the second is based on Myrinet. In this paper, we present two shared memory implementations meant for providing efficient communication of multi-core and SMP clusters. The first implementation is pure Java and uses Java threads to exploit multiple cores. Each Java thread represents anMPI level OS process and communication between these threads is achieved using shared data structures. The second implementation is based on the System V (SysV) IPC API. Our goal is to achieve better communication performance than already existing devices based on Transmission Control Protocol (TCP) and Myrinet on SMP and multi-core platforms. Another design goal is that existing parallel applications must not be modified for this purpose, thus relieving application developers from extra efforts of porting their applications to such modern clusters. We have benchmarked our implementations and report that threads-based device performs the best on an Intel quad-core Xeon cluster.