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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />	<style type="text/css">	body { font-family: Verdana, Arial, Helvetica, sans-serif;}	a.at-term {	font-style: italic; }	</style>	<title>Problems for which fine-grained parallelism is natural</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p>In cases with fine-grained parallelism, OpenMP may in fact perform better overall than MPI. However, the number of processors that can be used is limited by the size of the SMP nodes. In such cases, a multilevel implementation could allow 
scaling beyond a single SMP node, and hence faster overall throughput. The best performance should be obtained by maximizing the number of OpenMP threads on each node - watch out for memory bandwidth and cache effects, though! </p></body></html>

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