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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>Predefined Reduction Operations</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p>The predefined reduction operations that are built into MPI are:</p>

<table class="info" >
<tr>
<th>MPI Name</th>

<th>Function</th>
</tr>

<tr>
<td>MPI_MAX</td>

<td>Maximum</td>
</tr>

<tr>
<td>MPI_MIN</td>

<td>Minimum</td>
</tr>

<tr>
<td>MPI_SUM</td>

<td>Sum</td>
</tr>

<tr>
<td>MPI_PROD</td>

<td>Product</td>
</tr>

<tr>
<td>MPI_LAND</td>

<td>Logical AND</td>
</tr>

<tr>
<td>MPI_BAND</td>

<td>Bitwise AND</td>
</tr>

<tr>
<td>MPI_LOR</td>

<td>Logical OR</td>
</tr>

<tr>
<td>MPI_BOR</td>

<td>Bitwise OR</td>
</tr>

<tr>
<td>MPI_LXOR</td>

<td>Logical exclusive OR</td>
</tr>

<tr>
<td>MPI_BXOR</td>

<td>Bitwise exclusive OR</td>
</tr>

<tr>
<td>MPI_MAXLOC</td>

<td>Maximum and location</td>
</tr>

<tr>
<td>MPI_MINLOC</td>

<td>Minimum and location</td>
</tr>
</table>

<h3>Example of Global Reduction</h3>

<p>The following are examples in C and Fortran where the sum of all of the <var>x</var> values is placed in <var>result</var> only on process 0.</p>

<p class="codelang">C:</p>

<pre><code>MPI_Reduce(&amp;x, &amp;result, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD)</code></pre>

<p class="codelang">Fortran:</p>

<pre><code>CALL MPI_REDUCE(X, RESULT, 1, MPI_INTEGER, MPI_SUM, 0, MPI_COMM_WORLD, IERROR)</pre></code></body></html>

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