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119 lines
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<head><title>psb_info — Return information about PSBLAS parallel environment</title>
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<h4 class="subsectionHead"><span class="titlemark">7.2 </span> <a
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id="x70-1070007.2"></a>psb_info — Return information about PSBLAS parallel environment</h4>
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<pre class="verbatim" id="verbatim-62">
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call psb_info(ctxt, iam, np)
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</pre>
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<!--l. 69--><p class="nopar" >
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<!--l. 71--><p class="indent" > This subroutine returns information about the PSBLAS parallel environment,
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defining a virtual parallel machine.
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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">Asynchronous.
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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">ctxt</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.</dd></dl>
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<!--l. 84--><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">iam</span> </dt><dd
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class="description">Identifier of current process in the PSBLAS virtual parallel machine.<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: an integer value. <span
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class="cmsy-10">-</span>1 <span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">iam </span><span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1 
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</dd><dt class="description">
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<span
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class="cmbx-10">np</span> </dt><dd
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class="description">Number of processes in the PSBLAS 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">out</span>.<br
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class="newline" />Specified as: an integer variable.  </dd></dl>
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<!--l. 99--><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="x70-107002x1">For processes in the virtual parallel machine the identifier will satisfy
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0 <span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">iam </span><span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1;
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</li>
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<li
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class="enumerate" id="x70-107004x2">If the user has requested on <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_init</span></span></span> a number of processes less than
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the total available in the parallel execution environment, the remaining
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processes will have on return <span
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class="cmmi-10">iam </span>= <span
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class="cmsy-10">-</span>1; the only call involving <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">ctxt</span></span></span> that
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any such process may execute is to <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_exit</span></span></span>.</li></ol>
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