<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_info — Return information about PSBLAS parallel environment</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. 65--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu62.html" >next</a>] [<a href="userhtmlsu57.html" >prev</a>] [<a href="userhtmlsu57.html#tailuserhtmlsu57.html" >prev-tail</a>] [<a href="userhtmlsu56.html#tailuserhtmlsu58.html">tail</a>] [<a href="userhtmlsu59.html#userhtmlsu61.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">7.2 </span> <a id="x70-1070007.2"></a>psb_info — Return information about PSBLAS parallel environment</h4> <div class="verbatim" id="verbatim-62"> call psb_info(ctxt, iam, np) </div> <!--l. 69--><p class="nopar" > <!--l. 71--><p class="indent" > This subroutine returns information about the PSBLAS parallel environment, defining a virtual parallel machine. <dl class="description"><dt class="description"> <span class="cmbx-10">Type:</span> </dt><dd class="description">Asynchronous. </dd><dt class="description"> <span class="cmbx-10">On Entry</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">ctxt</span> </dt><dd class="description">the communication context identifying the virtual parallel machine.<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 variable.</dd></dl> <!--l. 84--><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">iam</span> </dt><dd class="description">Identifier of current process in the PSBLAS virtual parallel machine.<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" />Specified as: an integer value. <span class="cmsy-10">-</span>1 <span class="cmsy-10">≤ </span><span class="cmmi-10">iam </span><span class="cmsy-10">≤ </span><span class="cmmi-10">np </span><span class="cmsy-10">- </span>1  </dd><dt class="description"> <span class="cmbx-10">np</span> </dt><dd class="description">Number of processes in the PSBLAS virtual parallel machine.<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">out</span>.<br class="newline" />Specified as: an integer variable.  </dd></dl> <!--l. 99--><p class="noindent" ><span class="cmbx-12">Notes</span> <ol class="enumerate1" > <li class="enumerate" id="x70-107002x1">For processes in the virtual parallel machine the identifier will satisfy 0 <span class="cmsy-10">≤ </span><span class="cmmi-10">iam </span><span class="cmsy-10">≤ </span><span class="cmmi-10">np </span><span class="cmsy-10">- </span>1; </li> <li class="enumerate" id="x70-107004x2">If the user has requested on <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_init</span></span></span> a number of processes less than the total available in the parallel execution environment, the remaining processes will have on return <span class="cmmi-10">iam </span>= <span class="cmsy-10">-</span>1; the only call involving <span class="obeylines-h"><span class="verb"><span class="cmtt-10">ctxt</span></span></span> that any such process may execute is to <span class="obeylines-h"><span class="verb"><span class="cmtt-10">psb_exit</span></span></span>.</li></ol> <!--l. 111--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu62.html" >next</a>] [<a href="userhtmlsu57.html" >prev</a>] [<a href="userhtmlsu57.html#tailuserhtmlsu57.html" >prev-tail</a>] [<a href="userhtmlsu58.html" >front</a>] [<a href="userhtmlsu59.html#userhtmlsu61.html" >up</a>] </p></div> <!--l. 111--><p class="indent" > <a id="tailuserhtmlsu58.html"></a> </body></html>