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   <h4 class="subsectionHead"><span class="titlemark">7.2   </span> <a 
 id="x70-1070007.2"></a>psb_info &#8212; Return information about PSBLAS parallel environment</h4>
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-62">
call&#x00A0;psb_info(ctxt,&#x00A0;iam,&#x00A0;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">&#x2264; </span><span 
class="cmmi-10">iam </span><span 
class="cmsy-10">&#x2264; </span><span 
class="cmmi-10">np </span><span 
class="cmsy-10">- </span>1&#x00A0;
     </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. &#x00A0;</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">&#x2264; </span><span 
class="cmmi-10">iam </span><span 
class="cmsy-10">&#x2264; </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>
                                                                  

                                                                  
                                                                  

                                                                  
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