Nested parallelism for multi-core HPC systems using Java

Since its introduction in 1993, the Message Passing Interface (MPI) has become a de facto standard for writing High Performance Computing (HPC) applications on clusters and Massively Parallel Processors (MPPs). The recent emergence of multi-core processor systems presents a new challenge for establi...

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Veröffentlicht in:	Journal of parallel and distributed computing Jg. 69; H. 6; S. 532 - 545
Hauptverfasser:	Shafi, Aamir, Carpenter, Bryan, Baker, Mark
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Amsterdam Elsevier Inc 01.06.2009 Elsevier
Schlagworte:	Applied sciences Computer science; control theory; systems Computer systems and distributed systems. User interface Exact sciences and technology Java MPI MPJ MPJ express Multi-core messaging Programming theory Software Theoretical computing MPJ express Java MPI Multi-core messaging MPJ High performance Parallel algorithm JAVA language Distributed system Distributed computing Multicore processor Multiprocessor Distributed memory Communicating process Message passing Massive parallelism Message passing interface System core Nested parallelism Shared memory
ISSN:	0743-7315, 1096-0848
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Abstract	Since its introduction in 1993, the Message Passing Interface (MPI) has become a de facto standard for writing High Performance Computing (HPC) applications on clusters and Massively Parallel Processors (MPPs). The recent emergence of multi-core processor systems presents a new challenge for established parallel programming paradigms, including those based on MPI. This paper presents a new Java messaging system called MPJ Express. Using this system, we exploit multiple levels of parallelism–messaging and threading–to improve application performance on multi-core processors. We refer to our approach as nested parallelism. This MPI-like Java library can support nested parallelism by using Java or Java OpenMP (JOMP) threads within an MPJ Express process. Practicality of this approach is assessed by porting to Java a massively parallel structure formation code from Cosmology called Gadget-2. We introduce nested parallelism in the Java version of the simulation code and report good speed-ups. To the best of our knowledge it is the first time this kind of hybrid parallelism is demonstrated in a high performance Java application.
AbstractList	Since its introduction in 1993, the Message Passing Interface (MPI) has become a de facto standard for writing High Performance Computing (HPC) applications on clusters and Massively Parallel Processors (MPPs). The recent emergence of multi-core processor systems presents a new challenge for established parallel programming paradigms, including those based on MPI. This paper presents a new Java messaging system called MPJ Express. Using this system, we exploit multiple levels of parallelism-messaging and threading-to improve application performance on multi-core processors. We refer to our approach as nested parallelism. This MPI-like Java library can support nested parallelism by using Java or Java OpenMP (JOMP) threads within an MPJ Express process. Practicality of this approach is assessed by porting to Java a massively parallel structure formation code from Cosmology called Gadget-2. We introduce nested parallelism in the Java version of the simulation code and report good speed-ups. To the best of our knowledge it is the first time this kind of hybrid parallelism is demonstrated in a high performance Java application. Since its introduction in 1993, the Message Passing Interface (MPI) has become a de facto standard for writing High Performance Computing (HPC) applications on clusters and Massively Parallel Processors (MPPs). The recent emergence of multi-core processor systems presents a new challenge for established parallel programming paradigms, including those based on MPI. This paper presents a new Java messaging system called MPJ Express. Using this system, we exploit multiple levels of parallelism–messaging and threading–to improve application performance on multi-core processors. We refer to our approach as nested parallelism. This MPI-like Java library can support nested parallelism by using Java or Java OpenMP (JOMP) threads within an MPJ Express process. Practicality of this approach is assessed by porting to Java a massively parallel structure formation code from Cosmology called Gadget-2. We introduce nested parallelism in the Java version of the simulation code and report good speed-ups. To the best of our knowledge it is the first time this kind of hybrid parallelism is demonstrated in a high performance Java application.
Author	Shafi, Aamir Baker, Mark Carpenter, Bryan
Author_xml	– sequence: 1 givenname: Aamir surname: Shafi fullname: Shafi, Aamir email: aamir.shafi@seecs.edu.pk, aamir.shafi@niit.edu.pk organization: School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Pakistan – sequence: 2 givenname: Bryan surname: Carpenter fullname: Carpenter, Bryan email: bryan.carpenter@port.ac.uk organization: School of Computing, The University of Portsmouth, UK – sequence: 3 givenname: Mark surname: Baker fullname: Baker, Mark email: mark.baker@computer.org organization: School of Systems Engineering, The University of Reading, UK
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Cites_doi	10.1002/cpe.622 10.1002/(SICI)1096-9128(199809/11)10:11/13<985::AID-CPE404>3.0.CO;2-A 10.1111/j.1365-2966.2005.09655.x 10.1006/jcph.1994.1050 10.1002/cpe.860 10.1002/cpe.579 10.1007/3-540-49372-7_4 10.1002/(SICI)1096-9128(199706)9:6<413::AID-CPE317>3.0.CO;2-B 10.1038/nature03597 10.1016/0167-8191(94)90033-7 10.1145/1248377.1248387 10.1038/324446a0 10.1007/BFb0097964 10.1109/MC.2005.160
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Keywords	MPJ express Java MPI Multi-core messaging MPJ High performance Parallel algorithm JAVA language Distributed system Distributed computing Multicore processor Multiprocessor Distributed memory Communicating process Message passing Massive parallelism Message passing interface System core Nested parallelism Shared memory
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SubjectTerms	Applied sciences Computer science; control theory; systems Computer systems and distributed systems. User interface Exact sciences and technology Java MPI MPJ MPJ express Multi-core messaging Programming theory Software Theoretical computing
Title	Nested parallelism for multi-core HPC systems using Java
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