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<head><title>Communication routines</title> 
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   <h3 class="sectionHead"><span class="titlemark">5   </span> <a 
 id="x35-720005"></a>Communication routines</h3>
<!--l. 7--><p class="noindent" >The routines in this chapter implement various global communication operators on
vectors associated with a discretization mesh. For auxiliary communication routines
not tied to a discretization space see&#x00A0;<a 
href="userhtmlse6.html#x40-770006">6<!--tex4ht:ref: sec:toolsrout --></a>.
                                                                  

                                                                  
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   &#x00A0;<span class="subsectionToc" >5.1 <a 
href="userhtmlsu26.html#x36-730005.1">psb_halo &#8212; Halo Data Communication</a></span>
<br />   &#x00A0;<span class="subsectionToc" >5.2 <a 
href="userhtmlsu27.html#x37-740005.2">psb_ovrl &#8212; Overlap Update</a></span>
<br />   &#x00A0;<span class="subsectionToc" >5.3 <a 
href="userhtmlsu28.html#x38-750005.3">psb_gather &#8212; Gather Global Dense Matrix</a></span>
<br />   &#x00A0;<span class="subsectionToc" >5.4 <a 
href="userhtmlsu29.html#x39-760005.4">psb_scatter &#8212; Scatter Global Dense Matrix</a></span>
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