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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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