CCJ: object‐based message passing and collective communication in Java

Nelisse, Arnold; Maassen, Jason; Kielmann, Thilo; Bal, Henri E.

doi:10.1002/cpe.664

Cited by 14 publications

(4 citation statements)

References 24 publications

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“…An example of such a data structure, SMC [23], is shown in Figure 14. Each row in the SMC is an object which can be manipulated (removed/inserted) without effecting the rest of the structure.…”

Section: An Object-oriented Approach For Storing Sparse Matricesmentioning

confidence: 99%

Data structures in Java for matrix computations

Gundersen

Steihaug

2004

Concurrency and Computation

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SUMMARYIn this paper we show how to utilize Java's native arrays for matrix computations. The disadvantages of Java arrays used as a 2D array for dense matrix computation are discussed and ways to improve the performance are examined. We show how to create efficient dynamic data structures for sparse matrix computations using Java's native arrays. This data structure is unique for Java and shown to be more dynamic and efficient than the traditional storage schemes for large sparse matrices. Numerical testing indicates that this new data structure, called Java Sparse Array, is competitive with the traditional Compressed Row Storage scheme on matrix computation routines. Java gives increased flexibility without losing efficiency. Compared with other object-oriented data structures Java Sparse Array is shown to have the same flexibility.

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Section: An Object-oriented Approach For Storing Sparse Matricesmentioning

confidence: 99%

Data structures in Java for matrix computations

Gundersen

Steihaug

2004

Concurrency and Computation

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“…Additional projects involving the optimization of Java collective communications for HPC are CCJ [23] and the Java Adlib collective library [24]. CCJ is an RMI-based Java collective communication library for HPC which implements a simple low-level API.…”

Section: Related Workmentioning

confidence: 99%

Design of efficient Java message-passing collectives on multi-core clusters

et al. 2010

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This paper presents a scalable and efficient Message-Passing in Java (MPJ) collective communication library for parallel computing on multi-core architectures. The continuous increase in the number of cores per processor underscores the need for scalable parallel solutions. Moreover, current system deployments are usually multi-core clusters, a hybrid shared/distributed memory architecture which increases the complexity of communication protocols. Here, Java represents an attractive choice for the development of communication middleware for these systems, as it provides built-in networking and multithreading support. As the gap between Java and compiled languages performance has been narrowing for the last years, Java is an emerging option for High Performance Computing (HPC).Our MPJ collective communication library increases Java HPC applications performance on multi-core clusters: (1) providing multi-core aware collective primitives;(2) implementing several algorithms (up to six) per collective operation, whereas publicly available MPJ libraries are usually restricted to one algorithm; (3) analyzing the efficiency of thread-based collective operations; (4) selecting at runtime the most efficient algorithm depending on the specific multi-core system architecture, and the number of cores and message length involved in the collective operation; (5) supporting the automatic performance tuning of the collectives depending on the system and communication parameters; and (6) allowing its integration in any MPJ implementation as it is based on MPJ point-to-point primitives. A performance evalDesign of efficient MPJ collectives on multi-core clusters 127 uation on an InfiniBand and Gigabit Ethernet multi-core cluster has shown that the implemented collectives significantly outperform the original ones, as well as higher speedups when analyzing the impact of their use on collective communications intensive Java HPC applications. Finally, the presented library has been successfully integrated in MPJ Express (http://mpj-express.org), and will be distributed with the next release.

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“…• CCJ [16], a pure Java communication library with an MPI-like syntax not compliant with the MPJ specification. It makes use of Java capabilities such as a threadbased programming model or sending of objects.…”

Section: Java Message-passing Librariesmentioning

confidence: 99%