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<head><title>psb_cdbldext — Build an extended communication descriptor</title>
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<!--l. 413--><div class="crosslinks"><p class="noindent">[<a
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<h4 class="subsectionHead"><span class="titlemark">6.6 </span> <a
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id="x46-830006.6"></a>psb_cdbldext — Build an extended communication descriptor</h4>
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<pre class="verbatim" id="verbatim-39">
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call psb_cdbldext(a,desc_a,nl,desc_out, info, extype)
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</pre>
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<!--l. 417--><p class="nopar" >
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<!--l. 419--><p class="indent" > This subroutine builds an extended communication descriptor, based on the input
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descriptor <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">desc_a</span></span></span> and on the stencil specified through the input sparse matrix
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">a</span></span></span>.
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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">a</span> </dt><dd
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class="description">A sparse matrix 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">in</span>.<br
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class="newline" />Specified as: a structured data type.
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</dd><dt class="description">
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<span
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class="cmbx-10">desc</span><span
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class="cmbx-10">_a</span> </dt><dd
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class="description">the communication descriptor.<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">in</span>.<br
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class="newline" />Specified as: a structured data of type <a
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href="userhtmlsu6.html#spdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_Tspmat</span><span
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class="cmtt-10">_type</span></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">nl</span> </dt><dd
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class="description">the number of additional layers desired.<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 value <span
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class="cmmi-10">nl </span><span
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class="cmsy-10">≥ </span>0.
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</dd><dt class="description">
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<span
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class="cmbx-10">extype</span> </dt><dd
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class="description">the kind of estension required.<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 class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ovt_xhal_</span></span></span>, <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ovt_asov_</span></span></span>, default:
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ovt_xhal_</span></span></span>
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</dd></dl>
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<!--l. 449--><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">desc</span><span
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class="cmbx-10">_out</span> </dt><dd
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class="description">the extended communication descriptor.<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: a structured data of type <a
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href="userhtmlsu5.html#descdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_desc</span><span
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class="cmtt-10">_type</span></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">info</span> </dt><dd
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class="description">Error code.<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">out</span>.<br
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class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
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<!--l. 463--><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="x46-83002x1">Specifying <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ovt_xhal_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">extype</span></span></span> argument the user will obtain a
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descriptor for a domain partition in which the additional layers are fetched
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as part of an (extended) halo; however the index-to-process mapping is
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identical to that of the base descriptor;
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</li>
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<li
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class="enumerate" id="x46-83004x2">Specifying <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ovt_asov_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">extype</span></span></span> argument the user will obtain
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a descriptor with an overlapped decomposition: the additional layer is
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aggregated to the local subdomain (and thus is an overlap), and a new
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halo extending beyond the last additional layer is formed.</li></ol>
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href="userhtmlsu39.html" >next</a>] [<a
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href="userhtmlsu34.html" >prev</a>] [<a
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href="userhtmlsu34.html#tailuserhtmlsu34.html" >prev-tail</a>] [<a
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href="userhtmlsu35.html" >front</a>] [<a
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href="userhtmlsu32.html#userhtmlsu38.html" >up</a>] </p></div>
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