[petsc-users] DIVERGED_NONLINEAR_SOLVE error

[Jin, Shuangshuang]

Hello,

     My code solves a linear system AX=B using superlu_dist in PETSc, and use some of X's data to solve a DAE problem. I get a very wild error:

     When I use less than 8 processors to run the code, it runs just fine with correct results. When I use greater than 8 processors, such as 16 or 32 processors, I'll get an error and a lot of generated core.##### files.

[0]PETSC ERROR: --------------------- Error Message ------------------------------------
[0]PETSC ERROR:   !
[0]PETSC ERROR: TSStep has failed due to DIVERGED_NONLINEAR_SOLVE, increase -ts_max_snes_failures or make negative to attempt recovery!
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Development GIT revision: a0a914e661bf6402b8edabe0f5a2dad46323f69f  GIT Date: 2013-06-05 14:18:39 -0500
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: dynSim on a arch-complex named node0055.local by d3m956 Fri Aug  2 11:56:10 2013
[0]PETSC ERROR: Libraries linked from /pic/projects/ds/petsc-dev.6.06.13/arch-complex/lib
[0]PETSC ERROR: Configure run at Fri Jul 26 14:32:37 2013
[0]PETSC ERROR: Configure options --with-scalar-type=complex --with-clanguage=C++ PETSC_ARCH=arch-complex --with-fortran-kernels=generic --download-superlu_dist --download-mumps --download-scalapack --download-parmetis --download-metis --download-elemental --with-debugging=0
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: TSStep() line 2515 in /pic/projects/ds/petsc-dev.6.06.13/src/ts/interface/ts.c
[0]PETSC ERROR: TSSolve() line 2632 in /pic/projects/ds/petsc-dev.6.06.13/src/ts/interface/ts.c
[0]PETSC ERROR: simu() line 566 in "unknowndirectory/"simulation.C
[0]PETSC ERROR: runSimulation() line 99 in "unknowndirectory/"dynSim.h
[node0055:32539] *** Process received signal ***
[node0055:32535] *** Process received signal ***
[node0055:32535] Signal: Aborted (6)
[node0055:32535] Signal code:  (24153104)
[node0055:32534] *** Process received signal ***
[node0055:32534] Signal: Aborted (6)
[node0055:32534] Signal code:  (24199552)
[node0055:32539] Signal: Aborted (6)
[node0055:32539] Signal code:  (24157648)
[node0055:32537] *** Process received signal ***
[node0055:32537] Signal: Aborted (6)
[node0055:32537] Signal code:  (24546704)
[node0055:32538] *** Process received signal ***

The Error Message from PETSc pointed out that "TSStep has failed due to DIVERGED_NONLINEAR_SOLVE, increase -ts_max_snes_failures or make negative to attempt recovery!", but I think it's because the superlu_dist computed an all "nan" X as I printed it out.

However, I don't understand why using 8 or 16 processors should make such a difference.

Can anyone give me some help for the trouble shooting?

Thanks,
Shuangshuang

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130802/5710bdf0/attachment.html>