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psblas3:
base/internals/psi_idx_ins_cnv.f90 base/modules/psb_base_tools_mod.f90 base/modules/psb_gen_block_map_mod.f90 base/modules/psb_hash_map_mod.f90 base/modules/psb_indx_map_mod.f90 base/modules/psb_list_map_mod.f90 base/modules/psb_repl_map_mod.f90 base/modules/psi_i_mod.f90 base/tools/psb_cdins.f90 docs/html/footnode.html docs/html/index.html docs/html/node1.html docs/html/node10.html docs/html/node100.html docs/html/node101.html docs/html/node102.html docs/html/node103.html docs/html/node104.html docs/html/node105.html docs/html/node106.html docs/html/node107.html docs/html/node108.html docs/html/node109.html docs/html/node11.html docs/html/node110.html docs/html/node111.html docs/html/node112.html docs/html/node113.html docs/html/node114.html docs/html/node115.html docs/html/node116.html docs/html/node117.html docs/html/node118.html docs/html/node119.html docs/html/node12.html docs/html/node120.html docs/html/node13.html docs/html/node14.html docs/html/node15.html docs/html/node16.html docs/html/node17.html docs/html/node18.html docs/html/node19.html docs/html/node2.html docs/html/node20.html docs/html/node21.html docs/html/node22.html docs/html/node23.html docs/html/node24.html docs/html/node25.html docs/html/node26.html docs/html/node27.html docs/html/node28.html docs/html/node29.html docs/html/node3.html docs/html/node30.html docs/html/node31.html docs/html/node32.html docs/html/node33.html docs/html/node34.html docs/html/node35.html docs/html/node36.html docs/html/node37.html docs/html/node38.html docs/html/node39.html docs/html/node4.html docs/html/node40.html docs/html/node41.html docs/html/node42.html docs/html/node43.html docs/html/node44.html docs/html/node45.html docs/html/node46.html docs/html/node47.html docs/html/node48.html docs/html/node49.html docs/html/node5.html docs/html/node50.html docs/html/node51.html docs/html/node52.html docs/html/node53.html docs/html/node54.html docs/html/node55.html docs/html/node56.html docs/html/node57.html docs/html/node58.html docs/html/node59.html docs/html/node6.html docs/html/node60.html docs/html/node61.html docs/html/node62.html docs/html/node63.html docs/html/node64.html docs/html/node65.html docs/html/node66.html docs/html/node67.html docs/html/node68.html docs/html/node69.html docs/html/node7.html docs/html/node70.html docs/html/node71.html docs/html/node72.html docs/html/node73.html docs/html/node74.html docs/html/node75.html docs/html/node76.html docs/html/node77.html docs/html/node78.html docs/html/node79.html docs/html/node8.html docs/html/node80.html docs/html/node81.html docs/html/node82.html docs/html/node83.html docs/html/node84.html docs/html/node85.html docs/html/node86.html docs/html/node87.html docs/html/node88.html docs/html/node89.html docs/html/node9.html docs/html/node90.html docs/html/node91.html docs/html/node92.html docs/html/node93.html docs/html/node94.html docs/html/node95.html docs/html/node96.html docs/html/node97.html docs/html/node98.html docs/html/node99.html docs/html/userhtml.html docs/psblas-3.0.pdf docs/src/intro.tex New docs for LIDX. New LIDX parm in idx_cnv_ins.
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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>Error handling</TITLE>
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<META NAME="description" CONTENT="Error handling">
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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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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -18,174 +18,172 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BODY >
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1464"
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HREF="node101.html">psb_errpush Pushes</A>
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<B> Up:</B> <A NAME="tex2html1460"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1454"
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HREF="node99.html">psb_rcv Receive</A>
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<B> <A NAME="tex2html1462"
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<B> Next:</B> <A NAME="tex2html1465"
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HREF="node101.html">Error handling</A>
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<B> Up:</B> <A NAME="tex2html1461"
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HREF="node84.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1457"
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HREF="node99.html">psb_snd Send</A>
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<B> <A NAME="tex2html1463"
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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="SECTION00090000000000000000">
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Error handling</A>
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</H1>
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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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<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,
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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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<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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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,
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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="6753"></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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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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<BR>
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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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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-->
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<IMG
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WIDTH="508" HEIGHT="142" ALIGN="MIDDLE" BORDER="0"
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SRC="img134.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">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="6754"></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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WIDTH="147" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img131.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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<BR>
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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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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-->
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<IMG
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WIDTH="508" HEIGHT="142" ALIGN="MIDDLE" BORDER="0"
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SRC="img134.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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WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img127.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="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img128.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="img129.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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<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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<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="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img125.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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<UL>
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<LI><A NAME="tex2html1465"
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HREF="node101.html">psb_errpush -- Pushes an error code onto the error
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stack</A>
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<LI><A NAME="tex2html1466"
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HREF="node102.html">psb_error -- Prints the error stack content and aborts
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execution</A>
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<LI><A NAME="tex2html1467"
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HREF="node103.html">psb_set_errverbosity -- Sets the verbosity of error
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messages.</A>
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<LI><A NAME="tex2html1468"
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HREF="node104.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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<!--End of Table of Child-Links-->
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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="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img132.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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<HR>
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HREF="node101.html">Error handling</A>
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<B> Up:</B> <A NAME="tex2html1461"
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HREF="node84.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1457"
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HREF="node99.html">psb_snd Send</A>
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