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psblas3:

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Updated docs.
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Salvatore Filippone
2014-03-25 11:24:42 +00:00
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>psb_scatter -- Scatter Global Dense Matrix</TITLE>
<META NAME="description" CONTENT="psb_scatter -- Scatter Global Dense Matrix">
<TITLE>psb_gather -- Gather Global Dense Matrix</TITLE>
<META NAME="description" CONTENT="psb_gather -- Gather Global Dense Matrix">
<META NAME="keywords" CONTENT="userhtml">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
@@ -18,59 +18,61 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<H2><A NAME="SECTION00064000000000000000">
psb_scatter -- Scatter Global Dense Matrix</A>
<H2><A NAME="SECTION00063000000000000000">
psb_gather -- Gather Global Dense Matrix</A>
</H2>
<P>
These subroutines scatters the portions of global dense matrix owned
by a process to all the processes in the processes grid.
These subroutines collect the portions of global dense matrix
distributed over all process into one single array stored on one
process.
<P>
<BR><P></P>
<DIV ALIGN="CENTER">
<!-- MATH
\begin{displaymath}
loc\_x_i \leftarrow scatter(glob\_x)
glob\_x \leftarrow collect(loc\_x_i)
\end{displaymath}
-->
<IMG
WIDTH="167" HEIGHT="28" BORDER="0"
SRC="img80.png"
ALT="\begin{displaymath}loc\_x_i \leftarrow scatter(glob\_x) \end{displaymath}">
WIDTH="162" HEIGHT="28" BORDER="0"
SRC="img70.png"
ALT="\begin{displaymath}glob\_x \leftarrow collect(loc\_x_i) \end{displaymath}">
</DIV>
<BR CLEAR="ALL">
<P></P>
@@ -80,7 +82,7 @@ where:
WIDTH="47" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img71.png"
ALT="$glob\_x$"></STRONG></DT>
<DD>is the global matrix <!-- MATH
<DD>is the global submatrix <!-- MATH
$glob\_x_{1:m,1:n}$
-->
<IMG
@@ -99,18 +101,18 @@ process <IMG
ALT="$i$">.
</DD>
<DT><STRONG><IMG
WIDTH="54" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
SRC="img81.png"
ALT="$scatter$"></STRONG></DT>
<DD>is the scatter function.
WIDTH="48" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
SRC="img74.png"
ALT="$collect$"></STRONG></DT>
<DD>is the collect function.
</DD>
</DL>
<P>
<BR><P></P>
<DIV ALIGN="CENTER"><A NAME="3192"></A>
<DIV ALIGN="CENTER"><A NAME="3212"></A>
<TABLE>
<CAPTION><STRONG>Table 17:</STRONG>
<CAPTION><STRONG>Table 16:</STRONG>
Data types</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">
@@ -122,19 +124,19 @@ Data types</CAPTION>
<TD ALIGN="LEFT"><B>Subroutine</B></TD>
</TR>
<TR><TD ALIGN="LEFT">Integer</TD>
<TD ALIGN="LEFT">psb_scatter</TD>
<TD ALIGN="LEFT">psb_gather</TD>
</TR>
<TR><TD ALIGN="LEFT">Short Precision Real</TD>
<TD ALIGN="LEFT">psb_scatter</TD>
<TD ALIGN="LEFT">psb_gather</TD>
</TR>
<TR><TD ALIGN="LEFT">Long Precision Real</TD>
<TD ALIGN="LEFT">psb_scatter</TD>
<TD ALIGN="LEFT">psb_gather</TD>
</TR>
<TR><TD ALIGN="LEFT">Short Precision Complex</TD>
<TD ALIGN="LEFT">psb_scatter</TD>
<TD ALIGN="LEFT">psb_gather</TD>
</TR>
<TR><TD ALIGN="LEFT">Long Precision Complex</TD>
<TD ALIGN="LEFT">psb_scatter</TD>
<TD ALIGN="LEFT">psb_gather</TD>
</TR>
</TABLE>
</DIV>
@@ -146,11 +148,11 @@ Data types</CAPTION>
<P>
<BR>
<IMG
WIDTH="480" HEIGHT="35" ALIGN="BOTTOM" BORDER="0"
SRC="img82.png"
WIDTH="471" HEIGHT="35" ALIGN="BOTTOM" BORDER="0"
SRC="img76.png"
ALT="\begin{lstlisting}
call psb_scatter(glob_x, loc_x, desc_a, info, root)
call psb_scatter(glob_x, loc_x, desc_a, info, root)
call psb_gather(glob_x, loc_x, desc_a, info, root)
call psb_gather(glob_x, loc_x, desc_a, info, root)
\end{lstlisting}">
<BR>
@@ -162,16 +164,21 @@ call psb_scatter(glob_x, loc_x, desc_a, info, root)
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>glob_x</STRONG></DT>
<DD>The array that must be scattered into local pieces.
<DT><STRONG>loc_x</STRONG></DT>
<DD>the local portion of global dense matrix
<IMG
WIDTH="47" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img71.png"
ALT="$glob\_x$">.
<BR>
Scope: <B>global</B>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: a rank one or two array.
Specified as: a rank one or two array or an object of type vdata<TT>psb_T_vect_type</TT>
indicated in Table&nbsp;<A HREF="#tab:gather">16</A>.
</DD>
<DT><STRONG>desc_a</STRONG></DT>
<DD>contains data structures for communications.
@@ -189,7 +196,7 @@ Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
WIDTH="75" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img77.png"
ALT="$root=-1$"> all
the processes have a copy of the global vector.
the processes will have a copy of the global vector.
<BR>
Scope: <B>global</B>
<BR>
@@ -211,21 +218,16 @@ Specified as: an integer variable <!-- MATH
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>loc_x</STRONG></DT>
<DD>the local portion of global dense matrix
<IMG
WIDTH="47" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img71.png"
ALT="$glob\_x$">.
<DT><STRONG>glob_x</STRONG></DT>
<DD>The array where the local parts must be gathered.
<BR>
Scope: <B>local</B>
Scope: <B>global</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>out</B>.
<BR>
Specified as: a rank one or two array containing numbers of the type
indicated in Table&nbsp;<A HREF="#tab:scatter">17</A>.
Specified as: a rank one or two array with the <code>ALLOCATABLE</code> attribute.
</DD>
<DT><STRONG>info</STRONG></DT>
<DD>Error code.
@@ -243,26 +245,26 @@ An integer value; 0 means no error has been detected.
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