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150 lines
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150 lines
6.1 KiB
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<h4 class="subsectionHead"><span class="titlemark">6.7 </span> <a
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id="x47-840006.7"></a>psb_spall — Allocates a sparse matrix</h4>
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<pre class="verbatim" id="verbatim-40">
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call psb_spall(a, desc_a, info, nnz, buildmode)
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</pre>
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<!--l. 551--><p class="nopar" >
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<!--l. 553--><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">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">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="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">nnz</span> </dt><dd
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class="description">An estimate of the number of nonzeroes in the local part of the assembled
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matrix.<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.
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</dd><dt class="description">
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<span
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class="cmbx-10">buildmode</span> </dt><dd
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class="description">Whether to keep track of matrix entries that do not belong to the
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current process.<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:
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an integer value <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_matbld_noremote_</span></span></span>, <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_matbld_remote_</span></span></span>. Default:
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_matbld_noremote_</span></span></span>.</dd></dl>
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<!--l. 576--><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">a</span> </dt><dd
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class="description">the matrix to be allocated.<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" />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">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. 589--><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="x47-84002x1">On exit from this routine the sparse matrix is in the build state.
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</li>
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<li
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class="enumerate" id="x47-84004x2">The descriptor may be in either the build or assembled state.
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</li>
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<li
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class="enumerate" id="x47-84006x3">Providing a good estimate for the number of nonzeroes <span
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class="cmmi-10">nnz </span>in the
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assembled matrix may substantially improve performance in the matrix
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build phase, as it will reduce or eliminate the need for (potentially
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multiple) data reallocations;
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</li>
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<li
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class="enumerate" id="x47-84008x4">Using <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_matbld_remote_</span></span></span> will cause an overhead at assembly time;</li></ol>
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