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125 lines
5.3 KiB
HTML
125 lines
5.3 KiB
HTML
5 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html >
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<head><title>psb_amx — Global maximum absolute value</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="src" content="userhtml.tex">
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</head><body
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>
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<!--l. 485--><div class="crosslinks"><p class="noindent">[<a
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<h4 class="subsectionHead"><span class="titlemark">7.13 </span> <a
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id="x81-1180007.13"></a>psb_amx — Global maximum absolute value</h4>
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<div class="verbatim" id="verbatim-96">
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call psb_amx(icontxt, dat, root)
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</div>
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<!--l. 489--><p class="nopar" >
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<!--l. 491--><p class="indent" > This subroutine implements a maximum absolute value reduction operation based
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on the underlying communication library.
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Synchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">icontxt</span> </dt><dd
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class="description">the communication context identifying the virtual parallel machine.<br
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class="newline" />Scope: <span
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class="cmbx-10">global</span>.<br
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class="newline" />Type: <span
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class="cmbx-10">required</span>.<br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an integer variable.
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</dd><dt class="description">
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<span
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class="cmbx-10">dat</span> </dt><dd
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class="description">The local contribution to the global maximum.<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span>.<br
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class="newline" />Type: <span
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class="cmbx-10">required</span>.<br
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class="newline" />Intent: <span
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class="cmbx-10">inout</span>.<br
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class="newline" />Specified as: an integer, real or complex variable, which may be a scalar, or
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a rank 1 or 2 array.  Type, kind, rank and size must agree on all processes.
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</dd><dt class="description">
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<span
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class="cmbx-10">root</span> </dt><dd
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class="description">Process to hold the final value, or <span
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class="cmsy-10">-</span>1 to make it available on all processes.<br
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class="newline" />Scope: <span
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class="cmbx-10">global</span>.<br
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class="newline" />Type: <span
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class="cmbx-10">optional</span>.<br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an integer value <span
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class="cmsy-10">-</span>1 <span
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class="cmmi-10"><</span>= <span
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class="cmmi-10">root <</span>= <span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1, default -1. <br
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class="newline" /></dd></dl>
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<!--l. 518--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">dat</span> </dt><dd
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class="description">On destination process(es), the result of the maximum operation.<br
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class="newline" />Scope: <span
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class="cmbx-10">global</span>.<br
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class="newline" />Type: <span
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class="cmbx-10">required</span>.<br
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class="newline" />Intent: <span
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class="cmbx-10">inout</span>.<br
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class="newline" />Specified as: an integer, real or complex variable, which may be a scalar, or
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a rank 1 or 2 array.  Type, kind, rank and size must agree on all processes.</dd></dl>
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<!--l. 530--><p class="noindent" ><span
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class="cmbx-12">Notes</span>
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<ol class="enumerate1" >
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<li
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class="enumerate" id="x81-118002x1">The <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">dat</span></span></span> argument is both input and output, and its value may be changed
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even on processes different from the final result destination.
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</li>
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<li
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class="enumerate" id="x81-118004x2">The <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">dat</span></span></span> argument may also be a long integer scalar.</li></ol>
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<!--l. 538--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu73.html" >next</a>] [<a
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href="userhtmlsu68.html" >prev</a>] [<a
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href="userhtmlsu68.html#tailuserhtmlsu68.html" >prev-tail</a>] [<a
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href="userhtmlsu69.html" >front</a>] [<a
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href="userhtmlsu59.html#userhtmlsu72.html" >up</a>] </p></div>
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<!--l. 538--><p class="indent" > <a
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id="tailuserhtmlsu69.html"></a>
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</body></html>
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