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Updated description of DOT and friends to account for optional GLOBAL
var.
This commit is contained in:
Salvatore Filippone
+116
-269
@@ -3,8 +3,8 @@
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<TITLE>psb_rcv -- Receive data</TITLE>
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HREF="node115.html">psb_rcv Receive</A>
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HREF="node99.html">Parallel environment routines</A>
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HREF="node115.html">psb_snd Send</A>
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HREF="node1.html">Contents</A></B>
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<BR></DIV>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION00090000000000000000">
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Error handling</A>
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</H1>
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<H2><A NAME="SECTION000817000000000000000">
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psb_rcv -- Receive data</A>
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</H2>
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<P>
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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,
|
||||
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
|
||||
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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Figure <A HREF="#fig:routerr">9</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,
|
||||
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
|
||||
pushed on stack, the program execution skips to a point where the
|
||||
error condition is handled; the error condition is handled either by
|
||||
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="7258"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 9:</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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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<SPAN CLASS="MATH"><IMG
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WIDTH="562" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
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SRC="img142.png"
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ALT="\fbox{\TheSbox}"></SPAN>
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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">10</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="7259"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 10:</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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||||
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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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||||
<SPAN CLASS="MATH"><IMG
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WIDTH="562" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
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SRC="img142.png"
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ALT="\fbox{\TheSbox}"></SPAN>
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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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ifstarsubroutinesubroutinepsb_errpushPushes an error code onto the error
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stack
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<P>
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<BR>
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<IMG
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WIDTH="423" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img144.png"
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ALT="\begin{lstlisting}
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call psb_errpush(err_c, r_name, i_err, a_err)
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\end{lstlisting}">
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<BR>
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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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<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>Asynchronous.
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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>err_c</STRONG></DT>
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<DD>the 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>in</B>.
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<BR>
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||||
Specified as: an integer.
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</DD>
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<DT><STRONG>r_name</STRONG></DT>
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<DD>the soutine where the error has been caught.
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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 string.
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<BR></DD>
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<DT><STRONG>i_err</STRONG></DT>
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<DD>addional info for 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>optional</B>
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||||
<BR>
|
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Specified as: an integer array
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<BR></DD>
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<DT><STRONG>a_err</STRONG></DT>
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<DD>addional info for 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>optional</B>
|
||||
<BR>
|
||||
Specified as: a string.
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<BR></DD>
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</DL>
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<P>
|
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ifstarsubroutinesubroutinepsb_errorPrints the error stack content and aborts
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execution
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<P>
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||||
<BR>
|
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<IMG
|
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WIDTH="214" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img145.png"
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ALT="\begin{lstlisting}
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call psb_error(icontxt)
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\end{lstlisting}">
|
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<BR>
|
||||
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||||
<P>
|
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<DL>
|
||||
<DT><STRONG>Type:</STRONG></DT>
|
||||
<DD>Asynchronous.
|
||||
</DD>
|
||||
<DT><STRONG><B>On Entry</B></STRONG></DT>
|
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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.
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<DD>the communication context identifying the virtual
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parallel machine.
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<BR>
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Scope: <B>global</B>
|
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Scope: <B>global</B>.
|
||||
<BR>
|
||||
Type: <B>optional</B>
|
||||
Type: <B>required</B>.
|
||||
<BR>
|
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Intent: <B>in</B>.
|
||||
<BR>
|
||||
Specified as: an integer.
|
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Specified as: an integer variable.
|
||||
</DD>
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<DT><STRONG>src</STRONG></DT>
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<DD>Source process.
|
||||
<BR>
|
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Scope: <B>global</B>.
|
||||
<BR>
|
||||
Type: <B>required</B>.
|
||||
<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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-->
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||||
<SPAN CLASS="MATH"><IMG
|
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WIDTH="147" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
|
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SRC="img145.png"
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ALT="$0<= src <= np-1$"></SPAN>.
|
||||
<BR></DD>
|
||||
<DT><STRONG>m</STRONG></DT>
|
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<DD>Number of rows.
|
||||
<BR>
|
||||
Scope: <B>global</B>.
|
||||
<BR>
|
||||
Type: <B>Optional</B>.
|
||||
<BR>
|
||||
Intent: <B>in</B>.
|
||||
<BR>
|
||||
Specified as: an integer value <!-- MATH
|
||||
$0<= m <= size(dat,1)$
|
||||
-->
|
||||
<SPAN CLASS="MATH"><IMG
|
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WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
|
||||
SRC="img142.png"
|
||||
ALT="$0<= m <= size(dat,1)$"></SPAN>.
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||||
<BR>
|
||||
When <SPAN CLASS="MATH"><IMG
|
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WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img138.png"
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ALT="$dat$"></SPAN> is a rank 2 array, specifies the number of rows to be sent
|
||||
independently of the leading dimension <SPAN CLASS="MATH"><IMG
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WIDTH="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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||||
SRC="img143.png"
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ALT="$size(dat,1)$"></SPAN>; must have the
|
||||
same value on sending and receiving processes.
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</DD>
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</DL>
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<P>
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ifstarsubroutinesubroutinepsb_set_errverbositySets the verbosity of error
|
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messages.
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<DL>
|
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<DT><STRONG><B>On Return</B></STRONG></DT>
|
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<DD>
|
||||
</DD>
|
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<DT><STRONG>dat</STRONG></DT>
|
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<DD>The data to be received.
|
||||
<BR>
|
||||
Scope: <B>local</B>.
|
||||
<BR>
|
||||
Type: <B>required</B>.
|
||||
<BR>
|
||||
Intent: <B>inout</B>.
|
||||
<BR>
|
||||
Specified as: an integer, real or complex variable, which may be a
|
||||
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 <SPAN CLASS="MATH"><IMG
|
||||
WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img140.png"
|
||||
ALT="$m$"></SPAN> is
|
||||
not specified, size must agree as well.
|
||||
</DD>
|
||||
</DL>
|
||||
|
||||
<P>
|
||||
<BR>
|
||||
<IMG
|
||||
WIDTH="261" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
|
||||
<BIG CLASS="LARGE"><B>Notes</B></BIG>
|
||||
|
||||
<OL>
|
||||
<LI>This subroutine implies a synchronization, but only between the
|
||||
calling process and the source process <SPAN CLASS="MATH"><IMG
|
||||
WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img146.png"
|
||||
ALT="\begin{lstlisting}
|
||||
call psb_set_errverbosity(v)
|
||||
\end{lstlisting}">
|
||||
<BR>
|
||||
|
||||
<P>
|
||||
<DL>
|
||||
<DT><STRONG>Type:</STRONG></DT>
|
||||
<DD>Asynchronous.
|
||||
</DD>
|
||||
<DT><STRONG><B>On Entry</B></STRONG></DT>
|
||||
<DD>
|
||||
</DD>
|
||||
<DT><STRONG>v</STRONG></DT>
|
||||
<DD>the verbosity level
|
||||
<BR>
|
||||
Scope: <B>global</B>
|
||||
<BR>
|
||||
Type: <B>required</B>
|
||||
<BR>
|
||||
Intent: <B>in</B>.
|
||||
<BR>
|
||||
Specified as: an integer.
|
||||
</DD>
|
||||
</DL>
|
||||
|
||||
<P>
|
||||
ifstarsubroutinesubroutinepsb_set_erractionSet the type of action to be
|
||||
taken upon error condition.
|
||||
|
||||
<P>
|
||||
<BR>
|
||||
<IMG
|
||||
WIDTH="291" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img147.png"
|
||||
ALT="\begin{lstlisting}
|
||||
call psb_set_erraction(err_act)
|
||||
\end{lstlisting}">
|
||||
<BR>
|
||||
|
||||
<P>
|
||||
<DL>
|
||||
<DT><STRONG>Type:</STRONG></DT>
|
||||
<DD>Asynchronous.
|
||||
</DD>
|
||||
<DT><STRONG><B>On Entry</B></STRONG></DT>
|
||||
<DD>
|
||||
</DD>
|
||||
<DT><STRONG>err_act</STRONG></DT>
|
||||
<DD>the type of action.
|
||||
<BR>
|
||||
Scope: <B>global</B>
|
||||
<BR>
|
||||
Type: <B>required</B>
|
||||
<BR>
|
||||
Intent: <B>in</B>.
|
||||
<BR>
|
||||
Specified as: an integer. Possible values: <code>psb_act_ret</code>,
|
||||
<code>psb_act_abort</code>.
|
||||
</DD>
|
||||
</DL>
|
||||
ALT="$src$"></SPAN>.
|
||||
</LI>
|
||||
</OL>
|
||||
|
||||
<P>
|
||||
|
||||
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|
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1696"
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HREF="node115.html">psb_rcv Receive</A>
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<B> <A NAME="tex2html1704"
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<B> Next:</B> <A NAME="tex2html1708"
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HREF="node117.html">Error handling</A>
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<B> Up:</B> <A NAME="tex2html1704"
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HREF="node99.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1700"
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HREF="node115.html">psb_snd Send</A>
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<B> <A NAME="tex2html1706"
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HREF="node1.html">Contents</A></B> </DIV>
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