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psblas3:
Updated docs.
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Salvatore Filippone
+230
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Data management routines</TITLE>
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<META NAME="description" CONTENT="Data management routines">
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<TITLE>psb_gather -- Gather Global Dense Matrix</TITLE>
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@@ -18,119 +18,255 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BR>
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<B> Next:</B> <A NAME="tex2html1080"
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HREF="node69.html">psb_cdall Allocates</A>
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<B> Up:</B> <A NAME="tex2html1076"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1070"
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HREF="node67.html">psb_scatter Scatter</A>
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<B> <A NAME="tex2html1078"
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<B> Next:</B> <A NAME="tex2html1088"
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HREF="node69.html">psb_scatter Scatter</A>
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<B> Up:</B> <A NAME="tex2html1084"
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HREF="node65.html">Communication routines</A>
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<B> Previous:</B> <A NAME="tex2html1078"
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HREF="node67.html">psb_ovrl Overlap</A>
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<B> <A NAME="tex2html1086"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION00070000000000000000"></A>
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<A NAME="sec:toolsrout"></A>
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<BR>
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Data management routines
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</H1>
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<H2><A NAME="SECTION00063000000000000000">
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psb_gather -- Gather Global Dense Matrix</A>
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</H2>
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<P>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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These subroutines collect the portions of global dense matrix
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distributed over all process into one single array stored on one
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process.
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<UL>
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<LI><A NAME="tex2html1081"
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HREF="node69.html">psb_cdall -- Allocates a communication descriptor</A>
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<LI><A NAME="tex2html1082"
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HREF="node70.html">psb_cdins -- Communication descriptor insert
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routine</A>
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<LI><A NAME="tex2html1083"
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HREF="node71.html">psb_cdasb -- Communication descriptor assembly
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routine</A>
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<LI><A NAME="tex2html1084"
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HREF="node72.html">psb_cdcpy -- Copies a communication descriptor</A>
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<LI><A NAME="tex2html1085"
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HREF="node73.html">psb_cdfree -- Frees a communication descriptor</A>
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<LI><A NAME="tex2html1086"
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HREF="node74.html">psb_cdbldext -- Build an extended communication
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descriptor</A>
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<LI><A NAME="tex2html1087"
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HREF="node75.html">psb_spall -- Allocates a sparse matrix</A>
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<LI><A NAME="tex2html1088"
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HREF="node76.html">psb_spins -- Insert a cloud of elements into a sparse
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matrix</A>
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<LI><A NAME="tex2html1089"
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HREF="node77.html">psb_spasb -- Sparse matrix assembly routine</A>
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<LI><A NAME="tex2html1090"
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HREF="node78.html">psb_spfree -- Frees a sparse matrix</A>
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<LI><A NAME="tex2html1091"
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HREF="node79.html">psb_sprn -- Reinit sparse matrix structure for psblas
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routines.</A>
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<LI><A NAME="tex2html1092"
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HREF="node80.html">psb_geall -- Allocates a dense matrix</A>
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<LI><A NAME="tex2html1093"
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HREF="node81.html">psb_geins -- Dense matrix insertion routine</A>
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<LI><A NAME="tex2html1094"
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HREF="node82.html">psb_geasb -- Assembly a dense matrix</A>
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<LI><A NAME="tex2html1095"
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HREF="node83.html">psb_gefree -- Frees a dense matrix</A>
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<LI><A NAME="tex2html1096"
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HREF="node84.html">psb_gelp -- Applies a left permutation to a dense
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matrix</A>
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<LI><A NAME="tex2html1097"
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HREF="node85.html">psb_glob_to_loc -- Global to local indices
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convertion</A>
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<LI><A NAME="tex2html1098"
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HREF="node86.html">psb_loc_to_glob -- Local to global indices
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conversion</A>
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<LI><A NAME="tex2html1099"
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HREF="node87.html">psb_is_owned -- </A>
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<LI><A NAME="tex2html1100"
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HREF="node88.html">psb_owned_index -- </A>
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<LI><A NAME="tex2html1101"
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HREF="node89.html">psb_is_local -- </A>
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<LI><A NAME="tex2html1102"
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HREF="node90.html">psb_local_index -- </A>
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<LI><A NAME="tex2html1103"
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HREF="node91.html">psb_get_boundary -- Extract list of boundary
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elements</A>
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<LI><A NAME="tex2html1104"
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HREF="node92.html">psb_get_overlap -- Extract list of overlap
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elements</A>
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<LI><A NAME="tex2html1105"
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HREF="node93.html">psb_sp_getrow -- Extract row(s) from a sparse
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matrix</A>
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<LI><A NAME="tex2html1106"
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HREF="node94.html">psb_sizeof -- Memory occupation</A>
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<LI><A NAME="tex2html1107"
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HREF="node95.html">Sorting utilities -- </A>
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</UL>
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<!--End of Table of Child-Links-->
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<BR><HR>
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER">
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<!-- MATH
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\begin{displaymath}
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glob\_x \leftarrow collect(loc\_x_i)
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\end{displaymath}
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-->
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<IMG
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WIDTH="163" HEIGHT="28" BORDER="0"
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SRC="img69.png"
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ALT="\begin{displaymath}glob\_x \leftarrow collect(loc\_x_i) \end{displaymath}">
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</DIV>
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<BR CLEAR="ALL">
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<P></P>
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where:
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<DL>
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<DT><STRONG><IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img70.png"
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ALT="$glob\_x$"></STRONG></DT>
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<DD>is the global submatrix <!-- MATH
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$glob\_x_{1:m,1:n}$
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-->
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<IMG
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WIDTH="91" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img71.png"
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ALT="$glob\_x_{1:m,1:n}$">
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</DD>
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<DT><STRONG><IMG
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WIDTH="43" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img72.png"
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ALT="$loc\_x_i$"></STRONG></DT>
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<DD>is the local portion of global dense matrix on
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process <IMG
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WIDTH="9" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
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SRC="img4.png"
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ALT="$i$">.
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</DD>
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<DT><STRONG><IMG
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WIDTH="49" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
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SRC="img73.png"
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ALT="$collect$"></STRONG></DT>
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<DD>is the collect function.
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</DD>
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</DL>
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER"><A NAME="3341"></A>
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<TABLE>
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<CAPTION><STRONG>Table 16:</STRONG>
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Data types</CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
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<TR><TD ALIGN="LEFT"><IMG
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WIDTH="33" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img74.png"
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ALT="$x_i, y$"></TD>
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<TD ALIGN="LEFT"><B>Subroutine</B></TD>
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</TR>
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<TR><TD ALIGN="LEFT">Integer</TD>
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<TD ALIGN="LEFT">psb_gather</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Short Precision Real</TD>
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<TD ALIGN="LEFT">psb_gather</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Long Precision Real</TD>
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<TD ALIGN="LEFT">psb_gather</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Short Precision Complex</TD>
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<TD ALIGN="LEFT">psb_gather</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Long Precision Complex</TD>
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<TD ALIGN="LEFT">psb_gather</TD>
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</TR>
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</TABLE>
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</DIV>
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</TD></TR>
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</TABLE>
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</DIV><P></P>
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<BR>
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<P>
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<BR>
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<IMG
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WIDTH="472" HEIGHT="35" ALIGN="BOTTOM" BORDER="0"
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SRC="img75.png"
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ALT="\begin{lstlisting}
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call psb_gather(glob_x, loc_x, desc_a, info, root)
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call psb_gather(glob_x, loc_x, desc_a, info, root)
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\end{lstlisting}">
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<BR>
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>loc_x</STRONG></DT>
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<DD>the local portion of global dense matrix
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<IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img70.png"
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ALT="$glob\_x$">.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a rank one or two array or an object of type vdata<TT>psb_T_vect_type</TT>
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indicated in Table <A HREF="#tab:gather">16</A>.
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</DD>
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<DT><STRONG>desc_a</STRONG></DT>
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<DD>contains data structures for communications.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>root</STRONG></DT>
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<DD>The process that holds the global copy. If <IMG
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WIDTH="74" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img76.png"
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ALT="$root=-1$"> all
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the processes will have a copy of the global vector.
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<BR>
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Scope: <B>global</B>
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<BR>
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Type: <B>optional</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer variable <!-- MATH
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$-1\le root\le np-1$
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-->
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<IMG
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WIDTH="141" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img77.png"
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ALT="$-1\le root\le np-1$">, default <IMG
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WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img78.png"
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ALT="$-1$">.
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</DD>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>glob_x</STRONG></DT>
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<DD>The array where the local parts must be gathered.
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<BR>
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Scope: <B>global</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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Specified as: a rank one or two array with the <code>ALLOCATABLE</code> attribute.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Error code.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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<P>
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<HR>
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HREF="node65.html">Communication routines</A>
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<B> Previous:</B> <A NAME="tex2html1078"
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HREF="node67.html">psb_ovrl Overlap</A>
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HREF="node1.html">Contents</A></B>
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