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Not sure what you mean by where is your matrix? I am simply running
ex6 in the ksp/examples/tests directory.<br>
<br>
The reason I ran this test is because I was seeing the same behavior
with my finite element code (on perfectly benign problems).<br>
<br>
Is there a built-in test that you use to check that superlu_dist is
working properly with petsc?<br>
i.e. something you know that works with with petsc 3.3-p5?<br>
<br>
-sanjay<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/23/12 4:56 PM, Jed Brown wrote:<br>
</div>
<blockquote
cite="mid:CAM9tzSnY9o6EckTmo_GkD6QxHjj3o54ragfJotbacPkr8fKfmw@mail.gmail.com"
type="cite">
<div dir="ltr">Where is your matrix? It might be ending up with a
very bad pivot. If the problem can be reproduced, it should be
reported to the SuperLU_DIST developers to fix. (Note that we do
not see this with other matrices.) You can also try MUMPS.</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Sun, Dec 23, 2012 at 6:48 PM, Sanjay
Govindjee <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:s_g@berkeley.edu" target="_blank">s_g@berkeley.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> I wanted to use
SuperLU Dist to perform a direct solve but seem to be
encountering<br>
a problem. I was wonder if this is a know issue and if
there is a solution for it.<br>
<br>
The problem is easily observed using ex6.c in
src/ksp/ksp/examples/tests.<br>
<br>
Out of the box: make runex6 produces a residual error of
O(1e-11), all is well.<br>
<br>
I then changed the run to run on two processors and add
the flag<br>
-pc_factor_mat_solver_package spooles this produces a
residual error of O(1e-11), all is still well.<br>
<br>
I then switch over to -pc_factor_mat_solver_package
superlu_dist and the<br>
residual error comes back as 22.6637! Something seems
very wrong.<br>
<br>
My build is perfectly vanilla:<br>
<br>
export PETSC_DIR=/Users/sg/petsc-3.3-p5/<br>
export PETSC_ARCH=intel<br>
<br>
./configure --with-cc=icc --with-fc=ifort \
-download-{spooles,parmetis,superlu_dist,prometheus,mpich,ml,hypre,metis}<br>
<br>
make PETSC_DIR=/Users/sg/petsc-3.3-p5/ PETSC_ARCH=intel
all<br>
make PETSC_DIR=/Users/sg/petsc-3.3-p5/ PETSC_ARCH=intel
test<span class="HOEnZb"><font color="#888888"><br>
<br>
-sanjay<br>
</font></span></div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
-----------------------------------------------
Sanjay Govindjee, PhD, PE
Professor of Civil Engineering
Vice Chair for Academic Affairs
779 Davis Hall
Structural Engineering, Mechanics and Materials
Department of Civil Engineering
University of California
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Voice: +1 510 642 6060
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