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psblas3:
Documentation changes. We have barely begun.....
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Salvatore Filippone
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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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<HTML>
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<HEAD>
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<TITLE>psb_rcv -- Receive data</TITLE>
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<META NAME="description" CONTENT="psb_rcv -- Receive data">
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<TITLE>Error handling</TITLE>
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@@ -18,172 +18,174 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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HREF="node90.html">Error handling</A>
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HREF="node73.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1292"
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HREF="node88.html">psb_snd Send</A>
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<B> <A NAME="tex2html1298"
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<B> Next:</B> <A NAME="tex2html1298"
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HREF="node90.html">psb_errpush Pushes</A>
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<B> Up:</B> <A NAME="tex2html1294"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1288"
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HREF="node88.html">psb_rcv Receive</A>
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<B> <A NAME="tex2html1296"
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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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<H2><A NAME="SECTION000816000000000000000">
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psb_rcv -- Receive data</A>
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</H2>
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<H1><A NAME="SECTION00090000000000000000">
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Error handling</A>
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</H1>
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<P>
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<PRE>
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call psb_rcv(icontxt, dat, src, m)
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</PRE>
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The PSBLAS library error handling policy has been completely rewritten
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in version 2.0. The idea behind the design of this new error handling
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strategy is to keep error messages on a stack allowing the user to
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trace back up to the point where the first error message has been
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generated. Every routine in the PSBLAS-2.0 library has, as last
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non-optional argument, an integer <code>info</code> variable; whenever,
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inside the routine, an error is detected, this variable is set to a
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value corresponding to a specific error code. Then this error code is
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also pushed on the error stack and then either control is returned to
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the caller routine or the execution is aborted, depending on the users
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choice. At the time when the execution is aborted, an error message is
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printed on standard output with a level of verbosity than can be
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chosen by the user. If the execution is not aborted, then, the caller
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routine checks the value returned in the <code>info</code> variable and, if
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not zero, an error condition is raised. This process continues on all the
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levels of nested calls until the level where the user decides to abort
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the program execution.
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<P>
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This subroutine receives a packet of data to a destination.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous: see usage notes.
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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>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine.
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Figure <A HREF="#fig:routerr">8</A> shows the layout of a generic <code>psb_foo</code>
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routine with respect to the PSBLAS-2.0 error handling policy. It is
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possible to see how, whenever an error condition is detected, the
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<code>info</code> variable is set to the corresponding error code which is,
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then, pushed on top of the stack by means of the
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<code>psb_errpush</code>. An error condition may be directly detected inside
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a routine or indirectly checking the error code returned returned by a
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called routine. Whenever an error is encountered, after it has been
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pushed on stack, the program execution skips to a point where the
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error condition is handled; the error condition is handled either by
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returning control to the caller routine or by calling the
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<code>psb\_error</code> routine which prints the content of the error stack
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and aborts the program execution, according to the choice made by the
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user with <code>psb_set_erraction</code>. The default is to print the error
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and terminate the program, but the user may choose to handle the error
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explicitly.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:routerr"></A><A NAME="6409"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 8:</STRONG>
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The layout of a generic <TT>psb_foo</TT>
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routine with respect to PSBLAS-2.0 error handling policy.</CAPTION>
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<TR><TD>
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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>in</B>.
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<BR>
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Specified as: an integer variable.
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</DD>
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<DT><STRONG>src</STRONG></DT>
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<DD>Source process.
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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>in</B>.
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<BR>
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Specified as: an integer value <!-- MATH
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$0<= src <= np-1$
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<IMG
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WIDTH="147" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img137.png"
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ALT="$0<= src <= np-1$">.
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<BR></DD>
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<DT><STRONG>m</STRONG></DT>
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<DD>Number of rows.
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WIDTH="535" HEIGHT="218" ALIGN="MIDDLE" BORDER="0"
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SRC="img20.png"
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ALT="\fbox{\TheSbox}">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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Figure <A HREF="#fig:errormsg">9</A> reports a sample error message generated by
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the PSBLAS-2.0 library. This error has been generated by the fact that
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the user has chosen the invalid ``FOO'' storage format to represent
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the sparse matrix. From this error message it is possible to see that
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the error has been detected inside the <code>psb_cest</code> subroutine
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called by <code>psb_spasb</code> ... by process 0 (i.e. the root process).
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:errormsg"></A><A NAME="6410"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 9:</STRONG>
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A sample PSBLAS-2.0 error
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message. Process 0 detected an error condition inside the psb_cest subroutine</CAPTION>
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<TR><TD>
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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 value <!-- MATH
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$0<= m <= size(dat,1)$
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<IMG
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WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img133.png"
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ALT="$0<= m <= size(dat,1)$">.
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<BR>
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When <IMG
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WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
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SRC="img134.png"
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ALT="$dat$"> is a rank 2 array, specifies the number of rows to be sent
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independently of the leading dimension <IMG
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WIDTH="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img135.png"
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ALT="$size(dat,1)$">; must have the
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same value on sending and receiving processes.
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</DD>
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</DL>
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WIDTH="535" HEIGHT="218" ALIGN="MIDDLE" BORDER="0"
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SRC="img20.png"
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ALT="\fbox{\TheSbox}">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<DL>
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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>dat</STRONG></DT>
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<DD>The data to be received.
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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>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array, or a character or logical scalar. Type, kind and rank must agree on sender and receiver process; if <IMG
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WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img131.png"
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ALT="$m$"> is
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not specified, size must agree as well.
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</DD>
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</DL>
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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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<P>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>This subroutine implies a synchronization, but only between the
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calling process and the source process <IMG
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WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img138.png"
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ALT="$src$">.
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</LI>
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</OL>
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<P>
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<UL>
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<LI><A NAME="tex2html1299"
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HREF="node90.html">psb_errpush -- Pushes an error code onto the error
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stack</A>
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<LI><A NAME="tex2html1300"
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HREF="node91.html">psb_error -- Prints the error stack content and aborts
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execution</A>
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<LI><A NAME="tex2html1301"
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HREF="node92.html">psb_set_errverbosity -- Sets the verbosity of error
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messages.</A>
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<LI><A NAME="tex2html1302"
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HREF="node93.html">psb_set_erraction -- Set the type of action to be
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taken upon error condition.</A>
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</UL>
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<B> Next:</B> <A NAME="tex2html1300"
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HREF="node90.html">Error handling</A>
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<B> Up:</B> <A NAME="tex2html1296"
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HREF="node73.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1292"
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HREF="node88.html">psb_snd Send</A>
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<B> <A NAME="tex2html1298"
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<B> Next:</B> <A NAME="tex2html1298"
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HREF="node90.html">psb_errpush Pushes</A>
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<B> Up:</B> <A NAME="tex2html1294"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1288"
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HREF="node88.html">psb_rcv Receive</A>
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<B> <A NAME="tex2html1296"
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HREF="node1.html">Contents</A></B>
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