22.html

来自「国外MPI教材」· HTML 代码 · 共 38 行

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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 Directives</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p>OpenMP directives are inserted at key locations in the source code. These directives take the form of comments in Fortran and #pragmas in C/C++. The compiler interprets the directives and creates the necessary code to parallelize the indicated tasks/regions.</p>

<p>For example, the serial code</p>

<code><pre>void main(){
  double x[1000];
  for (int i=0; i<1000; i++){
    big_calc(x[i]);
  }
}</pre></code>
  

<p>could be parallelized as</p>

<code><pre>void main(){
  double x[1000];
<b>#pragma omp parallel for</b>
  for (int i=0; i<1000; i++){
    big_calc(x[i]);
  }
}</pre></code>
   

<p>In this example, the directive causes a team of threads to be created and the loop iterations to be split up and distributed between them.</p></body></html>

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