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<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy">Thanks a lot, Jed and Aron.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy">Do you have ideas for this problem?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">But I encounter a new problem, the situation is:<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">1, the matrix is big, and can be partitioned to several blocks;<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">2, started several threads to handle each block of matrix;<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">3, integrated all block matrices together.<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:7.5pt"><o:p> </o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">Again, the program crashed with reporting:
<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><st1:PersonName w:st="on"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">"</span></font></st1:PersonName><span lang="EN-US">[0]PETSC ERROR: Caught
<font color="red"><span style="color:red">signal number 11 SEGV</span></font>: Segmentation Violation, probably memory access out of range<st1:PersonName w:st="on">"</st1:PersonName><o:p></o:p></span></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:7.5pt"><o:p> </o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">My libpetsc.a is built with option
<st1:PersonName w:st="on">"</st1:PersonName><font color="red"><span style="color:red">--with-mpi=0</span></font> --with-debugging=0 -with-log=0 -with-info=0<st1:PersonName w:st="on">"</st1:PersonName>.
<o:p></o:p></span></font></p>
<p class="MsoPlainText" style="layout-grid-mode:char"><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">Will it support this type of multiple threads?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;color:navy">Thanks,<o:p></o:p></span></font></p>
<p class="MsoNormal"><st1:PersonName w:st="on"><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;
color:navy">De</span></font></st1:PersonName><font size="1" color="navy" face="Arial"><span lang="EN-US" style="font-size:9.0pt;font-family:Arial;
color:navy">bao<o:p></o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma"> petsc-users-bounces@mcs.anl.gov
[mailto:petsc-users-bounces@mcs.anl.gov] <b><span style="font-weight:bold">On Behalf Of
</span></b>Jed Brown<br>
<b><span style="font-weight:bold">Sent:</span></b> Friday, August 05, 2011 9:26 PM<br>
<b><span style="font-weight:bold">To:</span></b> <st1:PersonName w:st="on">PETSc users list</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [petsc-users] PETSC ERROR: Caught signal number 15 Terminate</span></font><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><font size="3" face="宋体"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="宋体"><span lang="EN-US" style="font-size:12.0pt">On Fri, Aug 5, 2011 at 04:00,
<st1:PersonName w:st="on">De</st1:PersonName>bao Shao <<a href="mailto:Debao.Shao@brion.com">Debao.Shao@brion.com</a>> wrote:<o:p></o:p></span></font></p>
<p><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">1, I put <st1:PersonName w:st="on">
"</st1:PersonName>PetscInitialize<st1:PersonName w:st="on">"</st1:PersonName> at the beginning of main, and
<st1:PersonName w:st="on">"</st1:PersonName>PetscInitialize<st1:PersonName w:st="on">"</st1:PersonName> registers a signal handler to capture
<st1:PersonName w:st="on">"</st1:PersonName>SIGTERM<st1:PersonName w:st="on">"</st1:PersonName>;</span></font><span lang="EN-US"><o:p></o:p></span></p>
<p><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">2, the problem ran in server side will send SIGTERM to kill all of clients after one stage is done.</span></font><span lang="EN-US"><o:p></o:p></span></p>
<p><font size="1" face="宋体"><span lang="EN-US" style="font-size:9.0pt">3, then, unfortunately, the signal
<st1:PersonName w:st="on">"</st1:PersonName>SIGTERM<st1:PersonName w:st="on">"</st1:PersonName> is caught by the signal handler installed by
<st1:PersonName w:st="on">"</st1:PersonName>PetscInitialize<st1:PersonName w:st="on">"</st1:PersonName>, and caused to abort.</span></font><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><font size="3" face="宋体"><span lang="EN-US" style="font-size:12.0pt">You can remove the order dependence by running with -no_signal_handler or setting your own signal handler with:<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="宋体"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="宋体"><span lang="EN-US" style="font-size:12.0pt"><a href="http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-dev/docs/manualpages/Sys/PetscPushSignalHandler.html">http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-dev/docs/manualpages/Sys/PetscPushSignalHandler.html</a>
<o:p></o:p></span></font></p>
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