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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>OpenMP Performance Characteristics</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p> Some OpenMP performance characteristics are:</p>

<ul>
  <li>OpenMP is generally most effective for problems with "fine-grained" parallelism, e.g., loop-level parallelism.</li>
  <li>Can also be used for coarse-grained parallelism.</li>
  <li>Overheads for branching into parallel regions can be significant.</li>

  <ul><li>Expect considerable variation from machine to machine!</li></ul>

  <li>Scaling limit is ultimately set by the size of SMP nodes.</li>
  <li>In practice, overall intra-node memory bandwidth may further limit the number of processors that can be used effectively.</li>
  <ul><li>Contention for memory bandwidth can often be reduced by efficient cache usage</li>
</ul>
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