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<head><title>GPU example</title>
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<!--l. 420--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">] </span></p></div>
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<h4 class="subsectionHead"><span class="titlemark"><span
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class="cmr-12">4.2 </span></span> <a
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id="x16-150004.2"></a><span
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class="cmr-12">GPU example</span></h4>
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<!--l. 422--><p class="noindent" ><span
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class="cmr-12">The code reported in Figure</span><span
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class="cmr-12"> </span><a
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href="#x16-15001r5"><span
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class="cmr-12">5</span><!--tex4ht:ref: fig:gpu-ex1 --></a> <span
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class="cmr-12">shows how to set up a program exploiting the combined</span>
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<span
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class="cmr-12">GPU capabilities of PSBLAS and AMG4PSBLAS.</span>
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<!--l. 425--><p class="indent" > <a
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id="x16-15001r5"></a><hr class="float"><div class="float"
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>
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<div class="center"
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>
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<<<<<<< HEAD
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<!--l. 44--><p class="noindent" >
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<!--l. 45--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">call</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">p</span><span
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class="cmtt-12">%</span><span
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class="cmtt-12">init</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">contxt</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">ptype</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">info</span><span
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class="cmtt-12">)</span></div>
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<!--l. 48--><p class="noindent" ><span
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class="cmr-12">This method allocates and initializes the preconditioner </span><span class="lstinline"></span><span
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class="cmtt-12">p</span><span
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class="cmr-12">, according to the</span>
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<span
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class="cmr-12">preconditioner type chosen by the user.</span>
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<!--l. 52--><p class="noindent" ><span
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class="cmbx-12">Arguments</span>
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<div class="tabular"> <table id="TBL-2" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-2-1g"><col
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id="TBL-2-1"><col
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id="TBL-2-2"></colgroup><tr
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style="vertical-align:baseline;" id="TBL-2-1-"><td style="white-space:normal; text-align:left;" id="TBL-2-1-1"
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class="td11"><!--l. 56--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">contxt</span> </td> <td style="white-space:normal; text-align:left;" id="TBL-2-1-2"
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class="td11"><!--l. 56--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">type</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_ctxt_type</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">)</span><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-2-"><td style="white-space:normal; text-align:left;" id="TBL-2-2-1"
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class="td11"><!--l. 57--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-2-2-2"
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class="td11"><!--l. 57--><p class="noindent" ><span
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class="cmr-12">The communication context.</span> </td></tr><tr
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style="vertical-align:baseline;" id="TBL-2-3-"><td style="white-space:normal; text-align:left;" id="TBL-2-3-1"
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class="td11"><!--l. 58--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">ptype</span> </td> <td style="white-space:normal; text-align:left;" id="TBL-2-3-2"
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class="td11"><!--l. 58--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">character</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">len</span><span
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class="cmtt-12">=*),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">)</span> <span
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class="cmr-12">.</span></td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-4-"><td style="white-space:normal; text-align:left;" id="TBL-2-4-1"
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class="td11"><!--l. 59--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-2-4-2"
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class="td11"><!--l. 59--><p class="noindent" ><span
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class="cmr-12">The type of preconditioner. Its values are specified in Table</span><span
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class="cmr-12"> </span><a
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href="userhtmlse4.html#x14-13015r1"><span
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class="cmr-12">1</span><!--tex4ht:ref: tab:precinit --></a><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-5-"><td style="white-space:normal; text-align:left;" id="TBL-2-5-1"
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class="td11"><!--l. 61--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-2-5-2"
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class="td11"><!--l. 61--><p class="noindent" ><span
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class="cmr-12">Note that strings are case insensitive.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-6-"><td style="white-space:normal; text-align:left;" id="TBL-2-6-1"
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class="td11"><!--l. 62--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">info</span> </td><td style="white-space:normal; text-align:left;" id="TBL-2-6-2"
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class="td11"><!--l. 62--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">integer</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">out</span><span
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class="cmtt-12">)</span><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-7-"><td style="white-space:normal; text-align:left;" id="TBL-2-7-1"
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class="td11"><!--l. 63--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-2-7-2"
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class="td11"><!--l. 63--><p class="noindent" ><span
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class="cmr-12">Error code. If no error, 0 is returned. See Section</span><span
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class="cmr-12"> </span><a
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href="userhtmlse7.html#x27-310007"><span
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class="cmr-12">7</span><!--tex4ht:ref: sec:errors --></a> <span
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class="cmr-12">for details.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-2-8-"><td style="white-space:normal; text-align:left;" id="TBL-2-8-1"
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class="td11"> </td> </tr></table></div>
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=======
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<!--l. 437--><p class="noindent" >
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<div class="minipage"><pre class="verbatim" id="verbatim-10">
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! build a one-level RAS with overlap 2 and ILU(0) on the local blocks.
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call P%init(’AS’,info)
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call P%set(’SUB_OVR’,2,info)
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call P%build(A,desc_A,info)
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... ...
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! solve Ax=b with preconditioned BiCGSTAB
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  call psb_krylov(’BICGSTAB’,A,P,b,x,tol,desc_A,info)
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</pre>
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<!--l. 448--><p class="nopar" ></div></div>
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<br /> <div class="caption"
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><span class="id">Listing 5: </span><span
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class="content">setup of a one-level Schwarz preconditioner.</span></div><!--tex4ht:label?: x16-15001r5 -->
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>>>>>>> development
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</div><hr class="endfloat" />
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<!--l. 1--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="userhtmlsu6.html" ><span
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class="cmr-12">front</span></a><span
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class="cmr-12">] [</span><a
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