<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_cdbldext — Build an extended communication descriptor</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)"> <meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)"> <!-- html,3 --> <meta name="src" content="userhtml.tex"> <link rel="stylesheet" type="text/css" href="userhtml.css"> </head><body > <!--l. 413--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu39.html" >next</a>] [<a href="userhtmlsu34.html" >prev</a>] [<a href="userhtmlsu34.html#tailuserhtmlsu34.html" >prev-tail</a>] [<a href="userhtmlsu32.html#tailuserhtmlsu35.html">tail</a>] [<a href="userhtmlsu32.html#userhtmlsu38.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">6.6 </span> <a id="x46-830006.6"></a>psb_cdbldext — Build an extended communication descriptor</h4> <div class="verbatim" id="verbatim-62"> call psb_cdbldext(a,desc_a,nl,desc_out, info, extype) </div> <!--l. 417--><p class="nopar" > <!--l. 419--><p class="indent" > This subroutine builds an extended communication descriptor, based on the input descriptor <span class="obeylines-h"><span class="verb"><span class="cmtt-10">desc_a</span></span></span> and on the stencil specified through the input sparse matrix <span class="obeylines-h"><span class="verb"><span class="cmtt-10">a</span></span></span>. <dl class="description"><dt class="description"> <span class="cmbx-10">Type:</span> </dt><dd class="description">Synchronous. </dd><dt class="description"> <span class="cmbx-10">On Entry</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">a</span> </dt><dd class="description">A sparse matrix Scope:<span class="cmbx-10">local</span>.<br class="newline" />Type:<span class="cmbx-10">required</span>.<br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: a structured data type. </dd><dt class="description"> <span class="cmbx-10">desc</span><span class="cmbx-10">_a</span> </dt><dd class="description">the communication descriptor.<br class="newline" />Scope:<span class="cmbx-10">local</span>.<br class="newline" />Type:<span class="cmbx-10">required</span>.<br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: a structured data of type <a href="userhtmlsu6.html#spdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_Tspmat</span><span class="cmtt-10">_type</span></a>. </dd><dt class="description"> <span class="cmbx-10">nl</span> </dt><dd class="description">the number of additional layers desired.<br class="newline" />Scope:<span class="cmbx-10">global</span>.<br class="newline" />Type:<span class="cmbx-10">required</span>.<br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: an integer value <span class="cmmi-10">nl </span><span class="cmsy-10">≥ </span>0. </dd><dt class="description"> <span class="cmbx-10">extype</span> </dt><dd class="description">the kind of estension required.<br class="newline" />Scope:<span class="cmbx-10">global</span>.<br class="newline" />Type:<span class="cmbx-10">optional </span>.<br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: an integer value <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_ovt_xhal_</span></span></span>, <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_ovt_asov_</span></span></span>, default: <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_ovt_xhal_</span></span></span> </dd></dl> <!--l. 449--><p class="indent" > <dl class="description"><dt class="description"> <span class="cmbx-10">On Return</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">desc</span><span class="cmbx-10">_out</span> </dt><dd class="description">the extended communication descriptor.<br class="newline" />Scope:<span class="cmbx-10">local</span>.<br class="newline" />Type:<span class="cmbx-10">required</span>.<br class="newline" />Intent: <span class="cmbx-10">inout</span>.<br class="newline" />Specified as: a structured data of type <a href="userhtmlsu5.html#descdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_desc</span><span class="cmtt-10">_type</span></a>. </dd><dt class="description"> <span class="cmbx-10">info</span> </dt><dd class="description">Error code.<br class="newline" />Scope: <span class="cmbx-10">local </span><br class="newline" />Type: <span class="cmbx-10">required </span><br class="newline" />Intent: <span class="cmbx-10">out</span>.<br class="newline" />An integer value; 0 means no error has been detected.</dd></dl> <!--l. 463--><p class="noindent" ><span class="cmbx-12">Notes</span> <ol class="enumerate1" > <li class="enumerate" id="x46-83002x1">Specifying <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_ovt_xhal_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span class="cmtt-10">extype</span></span></span> argument the user will obtain a descriptor for a domain partition in which the additional layers are fetched as part of an (extended) halo; however the index-to-process mapping is identical to that of the base descriptor; </li> <li class="enumerate" id="x46-83004x2">Specifying <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_ovt_asov_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span class="cmtt-10">extype</span></span></span> argument the user will obtain a descriptor with an overlapped decomposition: the additional layer is aggregated to the local subdomain (and thus is an overlap), and a new halo extending beyond the last additional layer is formed.</li></ol> <!--l. 547--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu39.html" >next</a>] [<a href="userhtmlsu34.html" >prev</a>] [<a href="userhtmlsu34.html#tailuserhtmlsu34.html" >prev-tail</a>] [<a href="userhtmlsu35.html" >front</a>] [<a href="userhtmlsu32.html#userhtmlsu38.html" >up</a>] </p></div> <!--l. 547--><p class="indent" > <a id="tailuserhtmlsu35.html"></a> </body></html>