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<!--l. 1--><div class="crosslinks"><p class="noindent">[<a
href="userhtmlse9.html" >prev</a>] [<a
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<h3 class="sectionHead"><span class="titlemark">10 </span> <a
id="x98-13500010"></a>Preconditioner routines</h3>
id="x15-13500010"></a>Preconditioner routines</h3>
<!--l. 6--><p class="noindent" >The base PSBLAS library contains the implementation of two simple preconditioning
techniques:
<ul class="itemize1">
<li class="itemize">Diagonal Scaling
<li class="itemize">
<!--l. 9--><p class="noindent" >Diagonal Scaling
</li>
<li class="itemize">Block Jacobi with ILU(0) factorization</li></ul>
<li class="itemize">
<!--l. 10--><p class="noindent" >Block Jacobi with ILU(0) factorization</li></ul>
<!--l. 14--><p class="noindent" >The supporting data type and subroutine interfaces are defined in the module
<span class="obeylines-h"><span class="verb"><span
class="cmtt-10">psb_prec_mod</span></span></span>. The old interfaces <span class="obeylines-h"><span class="verb"><span
@@ -32,33 +34,686 @@ supported for backward compatibility
<div class="subsectionTOCS">
&#x00A0;<span class="subsectionToc" >10.1 <a
href="userhtmlsu84.html#x99-13600010.1">init &#8212; Initialize a preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.2 <a
href="userhtmlsu85.html#x101-13700010.2">build &#8212; Builds a preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.3 <a
href="userhtmlsu86.html#x102-13800010.3">apply &#8212; Preconditioner application routine</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.4 <a
href="userhtmlsu87.html#x103-13900010.4">descr &#8212; Prints a description of current preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.5 <a
href="userhtmlsu88.html#x104-14000010.5">clone &#8212; clone current preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.6 <a
href="userhtmlsu89.html#x105-14100010.6">free &#8212; Free a preconditioner</a></span>
</div>
<h4 class="subsectionHead"><span class="titlemark">10.1 </span> <a
id="x15-13600010.1"></a>init &#8212; Initialize a preconditioner</h4>
<pre class="verbatim" id="verbatim-97">
call&#x00A0;prec%init(icontxt,ptype,&#x00A0;info)
</pre>
<!--l. 30--><p class="nopar" >
<!--l. 32--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 33--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 33--><p class="noindent" >Asynchronous.
</dd><dt class="description">
<!--l. 34--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 34--><p class="noindent" >
</dd><dt class="description">
<!--l. 35--><p class="noindent" >
<span
class="cmbx-10">icontxt</span> </dt><dd
class="description">
<!--l. 35--><p class="noindent" >the communication context.<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 value.
</dd><dt class="description">
<!--l. 40--><p class="noindent" >
<span
class="cmbx-10">ptype</span> </dt><dd
class="description">
<!--l. 40--><p class="noindent" >the type of preconditioner. 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: a character string, see usage notes.
</dd><dt class="description">
<!--l. 53--><p class="noindent" >
<span
class="cmbx-10">On Exit</span> </dt><dd
class="description">
<!--l. 53--><p class="noindent" >
</dd><dt class="description">
<!--l. 55--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 55--><p class="noindent" >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">inout</span>.<br
class="newline" />Specified as: a preconditioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 60--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 60--><p class="noindent" >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" />Error code: if no error, 0 is returned.</dd></dl>
<!--l. 66--><p class="noindent" ><span
class="cmbx-12">Notes </span>Legal inputs to this subroutine are interpreted depending on the <span
class="cmmi-10">ptype </span>string as
follows<span class="footnote-mark"><a
href="userhtml16.html#fn4x0"><sup class="textsuperscript">4</sup></a></span><a
id="x15-136001f4"></a> :
<dl class="description"><dt class="description">
<!--l. 74--><p class="noindent" >
<span
class="cmbx-10">NONE</span> </dt><dd
class="description">
<!--l. 74--><p class="noindent" >No preconditioning, i.e. the preconditioner is just a copy operator.
</dd><dt class="description">
<!--l. 76--><p class="noindent" >
<span
class="cmbx-10">DIAG</span> </dt><dd
class="description">
<!--l. 76--><p class="noindent" >Diagonal scaling; each entry of the input vector is multiplied by the
reciprocal of the sum of the absolute values of the coefficients in the
corresponding row of matrix <span
class="cmmi-10">A</span>;
</dd><dt class="description">
<!--l. 79--><p class="noindent" >
<span
class="cmbx-10">BJAC</span> </dt><dd
class="description">
<!--l. 79--><p class="noindent" >Precondition by a factorization of the block-diagonal of matrix <span
class="cmmi-10">A</span>, where
block boundaries are determined by the data allocation boundaries
for each process; requires no communication. Only the incomplete
factorization <span
class="cmmi-10">ILU</span>(0) is currently implemented.</dd></dl>
<h4 class="subsectionHead"><span class="titlemark">10.2 </span> <a
id="x15-13700010.2"></a>build &#8212; Builds a preconditioner</h4>
<pre class="verbatim" id="verbatim-98">
call&#x00A0;prec%build(a,&#x00A0;desc_a,&#x00A0;info[,amold,vmold,imold])
</pre>
<!--l. 91--><p class="nopar" >
<!--l. 93--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 94--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 94--><p class="noindent" >Synchronous.
</dd><dt class="description">
<!--l. 95--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 95--><p class="noindent" >
</dd><dt class="description">
<!--l. 96--><p class="noindent" >
<span
class="cmbx-10">a</span> </dt><dd
class="description">
<!--l. 96--><p class="noindent" >the system sparse matrix. 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">in</span>, target.<br
class="newline" />Specified as: a sparse matrix data structure <a
href="userhtmlse3.html#spdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_Tspmat</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 101--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 101--><p class="noindent" >the preconditioner.<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">inout</span>.<br
class="newline" />Specified as: an already initialized precondtioner data structure
<a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a><br
class="newline" />
</dd><dt class="description">
<!--l. 106--><p class="noindent" >
<span
class="cmbx-10">desc</span><span
class="cmbx-10">_a</span> </dt><dd
class="description">
<!--l. 106--><p class="noindent" >the problem communication descriptor. 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">in</span>, target.<br
class="newline" />Specified as: a communication descriptor data structure <a
href="userhtmlse3.html#descdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_desc</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 116--><p class="noindent" >
<span
class="cmbx-10">amold</span> </dt><dd
class="description">
<!--l. 116--><p class="noindent" >The desired dynamic type for the internal matrix storage.<br
class="newline" />Scope: <span
class="cmbx-10">local</span>.<br
class="newline" />Type: <span
class="cmbx-10">optional</span>.<br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: an object of a class derived from <a
id="spbasedata"></a><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_base</span><span
class="cmtt-10">_sparse</span><span
class="cmtt-10">_mat</span>.
</dd><dt class="description">
<!--l. 121--><p class="noindent" >
<span
class="cmbx-10">vmold</span> </dt><dd
class="description">
<!--l. 121--><p class="noindent" >The desired dynamic type for the internal vector storage.<br
class="newline" />Scope: <span
class="cmbx-10">local</span>.<br
class="newline" />Type: <span
class="cmbx-10">optional</span>.<br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: an object of a class derived from <a
id="vbasedata"></a><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_base</span><span
class="cmtt-10">_vect</span><span
class="cmtt-10">_type</span>.
</dd><dt class="description">
<!--l. 126--><p class="noindent" >
<span
class="cmbx-10">imold</span> </dt><dd
class="description">
<!--l. 126--><p class="noindent" >The desired dynamic type for the internal integer vector storage.<br
class="newline" />Scope: <span
class="cmbx-10">local</span>.<br
class="newline" />Type: <span
class="cmbx-10">optional</span>.<br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: an object of a class derived from (integer)
<a
id="vbasedata"></a><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_base</span><span
class="cmtt-10">_vect</span><span
class="cmtt-10">_type</span>.</dd></dl>
<!--l. 133--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 134--><p class="noindent" >
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
<!--l. 134--><p class="noindent" >
</dd><dt class="description">
<!--l. 135--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 135--><p class="noindent" >the preconditioner.<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">inout</span>.<br
class="newline" />Specified as: a precondtioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a><br
class="newline" />
</dd><dt class="description">
<!--l. 140--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 140--><p class="noindent" >Error code.<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" />An integer value; 0 means no error has been detected.</dd></dl>
<!--l. 146--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">amold</span></span></span>, <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">vmold</span></span></span> and <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">imold</span></span></span> arguments may be employed to interface with special
devices, such as GPUs and other accelerators.
<h4 class="subsectionHead"><span class="titlemark">10.3 </span> <a
id="x15-13800010.3"></a>apply &#8212; Preconditioner application routine</h4>
<pre class="verbatim" id="verbatim-99">
call&#x00A0;prec%apply(x,y,desc_a,info,trans,work)
call&#x00A0;prec%apply(x,desc_a,info,trans)
</pre>
<!--l. 158--><p class="nopar" >
<!--l. 160--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 161--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 161--><p class="noindent" >Synchronous.
</dd><dt class="description">
<!--l. 162--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 162--><p class="noindent" >
</dd><dt class="description">
<!--l. 163--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 163--><p class="noindent" >the preconditioner. 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">in</span>.<br
class="newline" />Specified as: a preconditioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 168--><p class="noindent" >
<span
class="cmbx-10">x</span> </dt><dd
class="description">
<!--l. 168--><p class="noindent" >the source vector. 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">inout</span>.<br
class="newline" />Specified as: a rank one array or an object of type <a
href="userhtmlse3.html#vdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_vect</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 173--><p class="noindent" >
<span
class="cmbx-10">desc</span><span
class="cmbx-10">_a</span> </dt><dd
class="description">
<!--l. 173--><p class="noindent" >the problem communication descriptor. 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">in</span>.<br
class="newline" />Specified as: a communication data structure <a
href="userhtmlse3.html#descdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_desc</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 178--><p class="noindent" >
<span
class="cmbx-10">trans</span> </dt><dd
class="description">
<!--l. 178--><p class="noindent" >Scope: <br
class="newline" />Type: <span
class="cmbx-10">optional</span><br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: a character.
</dd><dt class="description">
<!--l. 183--><p class="noindent" >
<span
class="cmbx-10">work</span> </dt><dd
class="description">
<!--l. 183--><p class="noindent" >an optional work space Scope: <span
class="cmbx-10">local </span><br
class="newline" />Type: <span
class="cmbx-10">optional</span><br
class="newline" />Intent: <span
class="cmbx-10">inout</span>.<br
class="newline" />Specified as: a double precision array.</dd></dl>
<!--l. 190--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 191--><p class="noindent" >
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
<!--l. 191--><p class="noindent" >
</dd><dt class="description">
<!--l. 192--><p class="noindent" >
<span
class="cmbx-10">y</span> </dt><dd
class="description">
<!--l. 192--><p class="noindent" >the destination vector. 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">inout</span>.<br
class="newline" />Specified as: a rank one array or an object of type <a
href="userhtmlse3.html#vdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_vect</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 197--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 197--><p class="noindent" >Error code.<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" />An integer value; 0 means no error has been detected.</dd></dl>
<h4 class="subsectionHead"><span class="titlemark">10.4 </span> <a
id="x15-13900010.4"></a>descr &#8212; Prints a description of current preconditioner</h4>
<pre class="verbatim" id="verbatim-100">
call&#x00A0;prec%descr(info)
call&#x00A0;prec%descr(info,iout,&#x00A0;root)
</pre>
<!--l. 212--><p class="nopar" >
<!--l. 214--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 215--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 215--><p class="noindent" >Asynchronous.
</dd><dt class="description">
<!--l. 216--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 216--><p class="noindent" >
</dd><dt class="description">
<!--l. 217--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 217--><p class="noindent" >the preconditioner. 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">in</span>.<br
class="newline" />Specified as: a preconditioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 222--><p class="noindent" >
<span
class="cmbx-10">iout</span> </dt><dd
class="description">
<!--l. 222--><p class="noindent" >output unit. Scope: <span
class="cmbx-10">local </span><br
class="newline" />Type: <span
class="cmbx-10">optional</span><br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: an integer number. Default: default output unit.
</dd><dt class="description">
<!--l. 227--><p class="noindent" >
<span
class="cmbx-10">root</span> </dt><dd
class="description">
<!--l. 227--><p class="noindent" >Process from which to print Scope: <span
class="cmbx-10">local </span><br
class="newline" />Type: <span
class="cmbx-10">optional</span><br
class="newline" />Intent: <span
class="cmbx-10">in</span>.<br
class="newline" />Specified as: an integer number between 0 and <span
class="cmmi-10">np </span><span
class="cmsy-10">- </span>1, in which case
the specified process will print the description, or <span
class="cmsy-10">-</span>1, in which case all
processes will print. Default: 0.
</dd><dt class="description">
<!--l. 234--><p class="noindent" >
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
<!--l. 234--><p class="noindent" >
</dd><dt class="description">
<!--l. 235--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 235--><p class="noindent" >Error code.<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" />An integer value; 0 means no error has been detected.</dd></dl>
<h4 class="subsectionHead"><span class="titlemark">10.5 </span> <a
id="x15-14000010.5"></a>clone &#8212; clone current preconditioner</h4>
<pre class="verbatim" id="verbatim-101">
call&#x00A0;&#x00A0;prec%clone(precout,info)
</pre>
<!--l. 248--><p class="nopar" >
<!--l. 250--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 251--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 251--><p class="noindent" >Asynchronous.
</dd><dt class="description">
<!--l. 252--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 252--><p class="noindent" >
</dd><dt class="description">
<!--l. 253--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 253--><p class="noindent" >the preconditioner.<br
class="newline" />Scope: <span
class="cmbx-10">local</span>.<br
class="newline" /></dd></dl>
<!--l. 260--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 261--><p class="noindent" >
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
<!--l. 261--><p class="noindent" >
</dd><dt class="description">
<!--l. 262--><p class="noindent" >
<span
class="cmbx-10">precout</span> </dt><dd
class="description">
<!--l. 262--><p class="noindent" >A copy of the input object.
</dd><dt class="description">
<!--l. 263--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 263--><p class="noindent" >Return code.</dd></dl>
<h4 class="subsectionHead"><span class="titlemark">10.6 </span> <a
id="x15-14100010.6"></a>free &#8212; Free a preconditioner</h4>
<pre class="verbatim" id="verbatim-102">
call&#x00A0;prec%free(info)
</pre>
<!--l. 271--><p class="nopar" >
<!--l. 273--><p class="indent" >
<dl class="description"><dt class="description">
<!--l. 274--><p class="noindent" >
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">
<!--l. 274--><p class="noindent" >Asynchronous.
</dd><dt class="description">
<!--l. 275--><p class="noindent" >
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
<!--l. 275--><p class="noindent" >
</dd><dt class="description">
<!--l. 276--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 276--><p class="noindent" >the preconditioner.<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">inout</span>.<br
class="newline" />Specified as: a preconditioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 289--><p class="noindent" >
<span
class="cmbx-10">On Exit</span> </dt><dd
class="description">
<!--l. 289--><p class="noindent" >
</dd><dt class="description">
<!--l. 291--><p class="noindent" >
<span
class="cmbx-10">prec</span> </dt><dd
class="description">
<!--l. 291--><p class="noindent" >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">inout</span>.<br
class="newline" />Specified as: a preconditioner data structure <a
href="userhtmlse3.html#precdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_prec</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<!--l. 296--><p class="noindent" >
<span
class="cmbx-10">info</span> </dt><dd
class="description">
<!--l. 296--><p class="noindent" >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" />Error code: if no error, 0 is returned.</dd></dl>
<!--l. 302--><p class="noindent" ><span
class="cmbx-12">Notes </span>Releases all internal storage.
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