English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The paper demonstrates the optimization of the execution environment of ahybrid OpenMP+MPI computational fluid dynamics code (shallow water equationsolver) on a cluster enabled with Intel Xeon Phi coprocessors. The discussionincludes: (1) Controlling the number and affinity of OpenMP threads to optimizeaccess to memory bandwidth; (2) Tuning the inter-operation of OpenMP and MPI topartition the problem for better data locality; (3) Ordering the MPI ranks in away that directs some of the traffic into faster communication channels; (4)Using efficient peer-to-peer communication between Xeon Phi coprocessors basedon the InfiniBand fabric.  With tuning, the application has 90% percent efficiency of parallel scalingup to 8 Intel Xeon Phi coprocessors in 2 compute nodes. For larger problems,scalability is even better, because of the greater computation to communicationratio. However, problems of that size do not fit in the memory of onecoprocessor. The performance of the solver on one Intel Xeon Phi coprocessor7120P exceeds the performance on a dual-socket Intel Xeon E5-2697 v2 CPU by afactor of 1.6x. In a 2-node cluster with 4 coprocessors per compute node, theMIC architecture yields 5.8x more performance than the CPUs. Only one line oflegacy Fortran code had to be changed in order to achieve the reportedperformance on the MIC architecture (not counting changes to the command-lineinterface). The methodology discussed in this paper is directly applicable toother bandwidth-bound stencil algorithms utilizing a hybrid OpenMP+MPIapproach.

Cluster-level tuning of a shallow water equation solver on the Intel MIC architecture