[petsc-users] Using GAMG to speed up solving of Poisson eqn
TAY wee-beng
zonexo at gmail.com
Sat Jul 20 08:39:13 CDT 2013
Hi,
I'm trying to use GAMG to speed up solving of Poisson eqn. I used:
call KSPSetOptionsPrefix(ksp,"poisson_",ierr)
-poisson_pc_gamg_agg_nsmooths 1 -poisson_pc_type gamg
I remember it used to work in some problems but now it can't work, with
error:
*/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: Caught signal number 8 FPE: Floating Point
Exception,probably divide by zero/**/
/**/[0]PETSC ERROR: Try option -start_in_debugger or
-on_error_attach_debugger/**/
/**/[0]PETSC ERROR: or see
http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[0]PETSC
ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to
find memory corruption errors/**/
/**/[0]PETSC ERROR: likely location of problem given in stack below/**/
/**/[0]PETSC ERROR: --------------------- Stack Frames
------------------------------------/**/
/**/[0]PETSC ERROR: Note: The EXACT line numbers in the stack are not
available,/**/
/**/[0]PETSC ERROR: INSTEAD the line number of the start of the
function/**/
/**/[0]PETSC ERROR: is given./**/
/**/[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues_GMRES line 24
src/ksp/ksp/impls/gmres/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\impls\gmres\gmreig.c/**/
/**/[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues line 40
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: [0] PCGAMGOptprol_AGG line 1295
src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\agg.c/**/
/**/[0]PETSC ERROR: [0] PCSetUp_GAMG line 564
src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\gamg.c/**/
/**/[0]PETSC ERROR: [0] PCSetUp line 810
src/ksp/pc/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\INTERF~1\precon.c/**/
/**/[0]PETSC ERROR: [0] KSPSetUp line 182
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: [0] KSPSolve line 351
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: --------------------- Error Message
------------------------------------/**/
/**/[0]PETSC ERROR: Signal received!/**/
/**/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: Petsc Development HG revision:
9850aeb5d33f0b33bc931843c4b3b3b4f8df6a3b HG Date: Tue Oct 02 22:18:53
2012 -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:
C:\Obj_tmp\ibm3d_high_Re_staggered_AB2\Debug\ibm3d_high_Re_staggered_AB2.exe
on a petsc-3.3 named USER-PC by User Sat Jul 20 15:37:40 2013/**/
/**/[0]PETSC ERROR: Libraries linked from
/cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008/lib/**/
/**/[0]PETSC ERROR: Configure run at Thu Oct 4 10:01:13 2012/**/
/**/[0]PETSC ERROR: Configure options --with-cc="win32fe cl"
--with-fc="win32fe ifort" --with-cxx="win32fe cl"
--with-mpi-dir=/cygdrive/c/MPICH2/ --download-f-blas-lapack=1
--prefix=/cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008
--with-debugging=1 --useThreads=0/**/
/**/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: User provided function() line 0 in unknown directory
unknown file/**/
/**/application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0/**/
/**/
/**/job aborted:/**/
/**/rank: node: exit code[: error message]/**/
/**/0: User-PC: 59: process 0 exited without calling finalize/*/
/
I read in one of the threads that I can use:
-pc_type gamg -pc_gamg_agg_nsmooths 1 -mg_levels_ksp_type richardson
-mg_levels_pc_type sor
It worked but I got the msg:
WARNING! There are options you set that were not used!
WARNING! could be spelling mistake, etc!
Option left: name:-mg_levels_ksp_type value: richardson
Option left: name:-mg_levels_pc_type value: sor
Option left: name:-pc_gamg_agg_nsmooths value: 1
Option left: name:-pc_type value: gamg
Press any key to continue . . .
If I used this:
-poisson_pc_type gamg -poisson_pc_gamg_agg_nsmooths 1
-poisson_mg_levels_ksp_type richardson -poisson_mg_levels_pc_type sor
It aborts with error:
*/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: Caught signal number 8 FPE: Floating Point
Exception,probably divide by zero/**/
/**/[0]PETSC ERROR: Try option -start_in_debugger or
-on_error_attach_debugger/**/
/**/[0]PETSC ERROR: or see
http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[0]PETSC
ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to
find memory corruption errors/**/
/**/[0]PETSC ERROR: likely location of problem given in stack below/**/
/**/[0]PETSC ERROR: --------------------- Stack Frames
------------------------------------/**/
/**/[0]PETSC ERROR: Note: The EXACT line numbers in the stack are not
available,/**/
/**/[0]PETSC ERROR: INSTEAD the line number of the start of the
function/**/
/**/[0]PETSC ERROR: is given./**/
/**/[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues_GMRES line 24
src/ksp/ksp/impls/gmres/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\impls\gmres\gmreig.c/**/
/**/[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues line 40
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: [0] PCGAMGOptprol_AGG line 1295
src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\agg.c/**/
/**/[0]PETSC ERROR: [0] PCSetUp_GAMG line 564
src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\gamg.c/**/
/**/[0]PETSC ERROR: [0] PCSetUp line 810
src/ksp/pc/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\INTERF~1\precon.c/**/
/**/[0]PETSC ERROR: [0] KSPSetUp line 182
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: [0] KSPSolve line 351
src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c/**/
/**/[0]PETSC ERROR: --------------------- Error Message
------------------------------------/**/
/**/[0]PETSC ERROR: Signal received!/**/
/**/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: Petsc Development HG revision:
9850aeb5d33f0b33bc931843c4b3b3b4f8df6a3b HG Date: Tue Oct 02 22:18:53
2012 -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:
C:\Obj_tmp\ibm3d_high_Re_staggered_AB2\Debug\ibm3d_high_Re_staggered_AB2.exe
on a petsc-3.3 named USER-PC by User Sat Jul 20 15:36:24 2013/**/
/**/[0]PETSC ERROR: Libraries linked from
/cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008/lib/**/
/**/[0]PETSC ERROR: Configure run at Thu Oct 4 10:01:13 2012/**/
/**/[0]PETSC ERROR: Configure options --with-cc="win32fe cl"
--with-fc="win32fe ifort" --with-cxx="win32fe cl"
--with-mpi-dir=/cygdrive/c/MPICH2/ --download-f-blas-lapack=1
--prefix=/cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008
--with-debugging=1 --useThreads=0/**/
/**/[0]PETSC ERROR:
------------------------------------------------------------------------/**/
/**/[0]PETSC ERROR: User provided function() line 0 in unknown directory
unknown file/**/
/**/application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0/**/
/**/
/**/job aborted:/**/
/**/rank: node: exit code[: error message]/**/
/**/0: User-PC: 59: process 0 exited without calling finalize/**/
/*
So is there a recommended test command or method?
Thank!
--
Yours sincerely,
TAY wee-beng
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