On Sun, Apr 1, 2012 at 2:18 PM, Wen Jiang <span dir="ltr"><<a href="mailto:jiangwen84@gmail.com">jiangwen84@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Sorry for the last incomplete email. Please forget about it. Let me finish it up here.<div class="im"><br><br>Hello Everyone,<br><br>I am using KSPPRECONLY type ksp with SUPERLU
DIST. However, I found my code hangs inside superlu_dist solver and
never finishes. <br><br>The problem I am solving is a time-dependent
nonlinear pde and I use fully Newton-Raphson for each time step. So my
code will look like,<br>
<br></div>For Time STEP = From start to end<br><br> For Newton-Raphson Iterations = From 1 to max iterations<br> <br> Calculate Matrix A; (A is different for each Newton-Raphson iteration)<br> <br> Create KSP<br>
KSPSetOperator(A,A,same_nonzero_pattern)<br> KSPSolve;<br><br> KSPDestroy;<div class="im"><br><br> END Newton-Raphson Iterations<br><br>End Time STEP <br><br></div>
Could you give me any hints what the problem might be? I am using Petsc 3.1 p8 and superlu dist v2.4. And my code works fine with KSP iterative solver like GMRES. <br></blockquote><div><br></div><div>There are a list of things I would try:</div>
<div><br></div><div>1) Upgrading to the latest release</div><div><br></div><div>2) Trying MUMPS instead of SuperLU_dist</div><div><br></div><div>3) Get a stack trace from gdb to determine where it is hanging.</div><div><br>
</div><div>I would do whichever one is easiest.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Regards,<br>Wen<div class="HOEnZb">
<div class="h5"><br><br><div class="gmail_quote">On Sun, Apr 1, 2012 at 3:12 PM, Wen Jiang <span dir="ltr"><<a href="mailto:jiangwen84@gmail.com" target="_blank">jiangwen84@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Everyone,<br><br>I am using KSPPRECONLY type ksp with SUPERLU DIST. However, I found my code hangs inside superlu_dist solver and never finishes. <br>
<br>The problem I am solving is a time-dependent nonlinear pde and I use fully Newton-Raphson for each time step. So my code will look like,<br>
<br>For Time STEP = start to end<br><br> For Newton-Raphson Iterations = 1 to max iterations<br> <br> Calculate Matrix A;<br> <br><br><br> END Newton-Raphson Iterations<br><br>End Time STEP <br><br><br>
Could you give me any hints what the problem might be? I am using Petsc 3.1 p8 and superlu dist v2.4. <br>
</blockquote></div><br>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>