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<title>About BILCH</title>
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<h1>About BILCH</h1>
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<p><em>25 September 2015</em></p>
<p><p>How can an application use a multiprocessor effectively ?</p>
<h1>OS multiprocessor performance evaluation</h1>
<p>Current <a href="http://people.freebsd.org/~kris/scaling/dfly.html">operating systems</a> can handle multiprocessors well. Performance evaluation is typically done with benchmarks. Because of simplicity Sweep3D will be used. Later it is planned to use some of the <a href="https://asc.llnl.gov/sequoia/benchmarks/">ASC benchmarks</a> and other benchmarks.</p>
<h2>Sweep3D</h2>
<p>Explicit parallelism is by domain decomposition and message-passing. This version of <a href="blog/2015/sweep3d-benchmark.html">Sweep3D</a> supports MPI message passing libraries as well as a single processor version. Here is a <a href="http://github.com/heinerbilch/sweep3d">description</a> Here are <a href="http://www.cs.rice.edu/~alc/superpages/">older benchmarks</a> where I found the starting point.<br/><img src="ASC_co_sm.jpg" alt="ASC Logo" /></p>
<h2>Benchmarks</h2>
<p><a href="https://www.epcc.ed.ac.uk/research/computing/performance-characterisation-and-benchmarking/epcc-openmp-micro-benchmark-suite">Benchmarks</a> for OpenMP.<br/><a href="https://www.nersc.gov/users/computational-systems/cori/nersc-8-procurement/trinity-nersc-8-rfp/nersc-8-trinity-benchmarks/snap/">SNAP</a> an update of Sweep3D, intended for hybrid computing architectures.</p>
<h2>Tools</h2>
<p><a href="http://www.scalasca.org/software/scalasca-2.x/download.html">Scalasca 2.x series</a></p>
<h2>Future work</h2>
<p><a href="http://opencoarrays.org">Fortran Coarrays</a></p>
<h2>Applications</h2>
<p>Cosmological simulation <a href="http://www.mpa-garching.mpg.de/gadget/">GADGET - 2</a></p>
<h1>Flame Graphs</h1>
<p><a href="http://www.brendangregg.com/flamegraphs.html">Flame graphs</a> are a visualization of profiled software, allowing the most frequent code-paths to be identified quickly and accurately.</p>
<p><img src="tcp-conn.svg" alt="Flame Graph" /> </p></p>
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