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<head><title>psb_init — Initializes PSBLAS parallel environment</title>
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<h4 class="subsectionHead"><span class="titlemark">7.1 </span> <a
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id="x69-1060007.1"></a>psb_init — Initializes PSBLAS parallel environment</h4>
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<pre class="verbatim" id="verbatim-61">
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call psb_init(ctxt, np, basectxt, ids)
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</pre>
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<!--l. 11--><p class="nopar" >
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<!--l. 13--><p class="indent" > This subroutine initializes the PSBLAS parallel environment, defining a virtual
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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">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">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">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.  Default: use all available processes.
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</dd><dt class="description">
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<span
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class="cmbx-10">basectxt</span> </dt><dd
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class="description">the initial communication context. The new context will be defined
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from the processes participating in the initial one.<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.  Default: use MPI_COMM_WORLD.
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</dd><dt class="description">
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<span
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class="cmbx-10">ids</span> </dt><dd
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class="description">Identities of the processes to use for the new context; the argument is
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ignored when <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">np</span></span></span> is not specified. This allows the processes in the new
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environment to be in an order different from the original one.<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 array.  Default: use the indices (0<span
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class="cmmi-10">…</span><span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1).</dd></dl>
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<!--l. 42--><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">ctxt</span> </dt><dd
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class="description">the communication context identifying the virtual parallel machine, type
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_ctxt_type</span></span></span>. Note that this is always a duplicate of <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">basectxt</span></span></span>,
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so that library communications are completely separated from other
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communication operations.<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. 55--><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="x69-106002x1">A call to this routine must precede any other PSBLAS call.
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</li>
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<li
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class="enumerate" id="x69-106004x2">It is an error to specify a value for <span
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class="cmmi-10">np </span>greater than the number of processes
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available in the underlying base parallel environment.</li></ol>
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