George Almási

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BlueGene/L is currently the world's fastest supercomputer. It consists of a large number of low power dual-processor compute nodes interconnected by high speed torus and collective networks, Because compute nodes do not have shared memory, MPI is the the natural programming model for this machine. The BlueGene/L MPI library is a port of MPICH2.In this paper(More)
programming and operating environment J. E. Moreira G. Almási C. Archer R. Bellofatto P. Bergner J. R. Brunheroto M. Brutman J. G. Castaños P. G. Crumley M. Gupta T. Inglett D. Lieber D. Limpert P. McCarthy M. Megerian M. Mendell M. Mundy D. Reed R. K. Sahoo A. Sanomiya R. Shok B. Smith G. G. Stewart With up to 65,536 compute nodes and a peak performance of(More)
This paper describes the design and implementation of a scalable run-time system and an optimizing compiler for Unified Parallel C (UPC). An experimental evaluation on BlueGene/L®, a distributed-memory machine, demonstrates that the combination of the compiler with the runtime system produces programs with performance comparable to that of efficient(More)
Parallel computer architectures require innovative software solutions to utilize their capabilities. This is true for system software no less than for application programs. File system development for the IBM SP product line started with the Vesta research project, which introduced the ideas of parallel access to partitioned files. This technology was then(More)
The Blue Gene machines in production today run a small single-user, single-process kernel (CNK) having a limited functionality. Motivated by the desire to provide applications with a much richer operating environment, we evaluate the effect of replacing CNK with a standard Linux kernel on the compute nodes of Blue Gene/L. We show that with a relatively(More)
This paper gives an overview of the BlueGene/L Supercomputer. This is a jointly funded research partnership between IBM and the Lawrence Livermore National Laboratory as part of the United States Department of Energy ASCI Advanced Architecture Research Program. Application performance and scaling studies have recently been initiated with partners at a(More)