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Nekbone is a proxy application of Nek5000, a scalable Computational Fluid Dynamics (CFD) code used for modelling incompressible flows. The Nekbone mini-application is used by several international co-design centers to explore new concepts in computer science and to evaluate their performance. We present the design and implementation of a new communication kernel in the Nekbone mini-application with...
With the increasing prominence of many-core architectures and decreasing per-core resources on large supercomputers, a number of applications developers are investigating the use of hybrid MPI+threads programming to utilize computational units while sharing memory. An MPI-only model that uses one MPI process per system core is capable of effectively utilizing the processing units, but it fails to...
Programming of high performance computing systems has become more complex over time. Several layers of parallelism need to be exploited to efficiently utilize the available resources. To support application developers and performance analysts we propose a technique for identifying the most performance critical optimization targets in distributed heterogeneous applications. We have developed CASITA,...
Effective combination of inter-node and intra-node parallelism is recognized to be a major challenge for future extreme-scale systems. Many researchers have demonstrated the potential benefits of combining both levels of parallelism, including increased communication-computation overlap, improved memory utilization, and effective use of accelerators. However, current "hybrid programming'' approaches...
High performance computing with low cost machines becomes a reality. As an example, the Sony playstation3 gaming console offers performances up to 150 gflops for a machinepsilas retail price of $400. Unfortunately, higher performances are achieved when the programmer exploits the architectural specificities of its Cell processor: he has to focus on inter-processor communications, task allocations...
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