[petsc-dev] PCApplyTranspose in BiCG

Fri Apr 6 19:46:46 CDT 2012

   A change in tfqmr that broke it? A change in some underlying thing that tfqmr that broke it.

   The "correct" way to track down the "bad" change is to us bisection with mecurial http://www.selenic.com/mercurial/hg.1.html#bisect it lets you quickly zoom into the change set that causes the change.

    Barry

On Mar 23, 2012, at 3:35 AM, Alexander Grayver wrote:

> Barry,
> 
> gmres produces the same result.
> What does that mean?
> 
> On 22.03.2012 21:10, Barry Smith wrote:
>>    Ok, first thing to confirm is if other KSP also produce different results. Run both exactly the same but use -ksp_type gmres on both; does it produce different results or the same?
>> 
>>    Barry
>> 
>> On Mar 22, 2012, at 12:30 PM, Alexander Grayver wrote:
>> 
>>> Jed,
>>> 
>>> Ok, I see. Initially I've changed solver because I observed one thing. I have two petsc-dev (one is older than the other) versions compiled.
>>> Running the same program with both gives different results:
>>> 
>>> ./solveTest -ksp_view -ksp_converged_reason -ksp_monitor_true_residual -log_summary -mat_type aij -ksp_rtol 1.0e-7 -ksp_type tfqmr -pc_type sor -ksp_max_it 750
>>>   0 KSP preconditioned resid norm 9.760858225033e-10 true resid norm 4.108026443997e-08 ||r(i)||/||b|| 1.000000000000e+00
>>>   1 KSP preconditioned resid norm 9.497939702484e-10 true resid norm 3.591828545356e-08 ||r(i)||/||b|| 8.743440662618e-01
>>>   1 KSP preconditioned resid norm 1.341212527158e-09 true resid norm 3.754099340764e-08 ||r(i)||/||b|| 9.138449793207e-01
>>>   2 KSP preconditioned resid norm 9.481744679086e-10 true resid norm 3.710424003325e-08 ||r(i)||/||b|| 9.032132713620e-01
>>>   2 KSP preconditioned resid norm 1.340878639500e-09 true resid norm 3.730261027312e-08 ||r(i)||/||b|| 9.080421166135e-01
>>>   3 KSP preconditioned resid norm 9.481415577317e-10 true resid norm 3.725585425324e-08 ||r(i)||/||b|| 9.069039540306e-01
>>>  ...
>>> 750 KSP preconditioned resid norm 1.340874209607e-09 true resid norm 3.726506102951e-08 ||r(i)||/||b|| 9.071280708031e-01
>>> Linear solve did not converge due to DIVERGED_ITS iterations 750
>>> KSP Object: 1 MPI processes
>>>   type: tfqmr
>>>   maximum iterations=750, initial guess is zero
>>>   tolerances:  relative=1e-07, absolute=1e-50, divergence=10000
>>>   left preconditioning
>>>   using PRECONDITIONED norm type for convergence test
>>> PC Object: 1 MPI processes
>>>   type: sor
>>>     SOR: type = local_symmetric, iterations = 1, local iterations = 1, omega = 1
>>>   linear system matrix = precond matrix:
>>>   Matrix Object:   1 MPI processes
>>>     type: seqaij
>>>     rows=1375920, cols=1375920
>>>     total: nonzeros=17671714, allocated nonzeros=17671714
>>>     total number of mallocs used during MatSetValues calls =0
>>>       not using I-node routines
>>> 
>>> Using Petsc Development HG revision: 59ca71b85d784abbe22f12c34ffcb2ccc6dc68b0  HG Date: Tue Mar 20 01:05:13 2012 -0500
>>> Configure options: --with-petsc-arch=openmpi-intel-complex-release-c --with-mpi-dir=/opt/mpi/intel/openmpi-1.4.2 --with-scalar-type=complex --with-precision=double --with-blas-lapack-dir=/usr/local/lib --with-x=0 --with-debugging=0
>>> 
>>> #######################################
>>> And now second one:
>>> ./solveTest -ksp_view -ksp_converged_reason -ksp_monitor_true_residual -log_summary -mat_type aij -ksp_rtol 1.0e-7 -ksp_type tfqmr -pc_type sor -ksp_max_it 750
>>>   0 KSP preconditioned resid norm 9.760858225034e-10 true resid norm 4.108026443997e-08 ||r(i)||/||b|| 1.000000000000e+00
>>>   1 KSP preconditioned resid norm 9.497930576113e-10 true resid norm 3.591633653854e-08 ||r(i)||/||b|| 8.742966246242e-01
>>>   1 KSP preconditioned resid norm 1.341211098002e-09 true resid norm 3.754049143693e-08 ||r(i)||/||b|| 9.138327600539e-01
>>>   2 KSP preconditioned resid norm 9.481662292281e-10 true resid norm 3.709648505700e-08 ||r(i)||/||b|| 9.030244951612e-01
>>>   2 KSP preconditioned resid norm 1.340863953080e-09 true resid norm 3.730358317575e-08 ||r(i)||/||b|| 9.080657995827e-01
>>>   3 KSP preconditioned resid norm 9.481308142928e-10 true resid norm 3.725036905334e-08 ||r(i)||/||b|| 9.067704300630e-01
>>> ...
>>> 230 KSP preconditioned resid norm 8.875661094394e-17 true resid norm 1.062030983067e-14 ||r(i)||/||b|| 2.585258389996e-07
>>> Linear solve converged due to CONVERGED_RTOL iterations 230
>>> KSP Object: 1 MPI processes
>>>   type: tfqmr
>>>   maximum iterations=750, initial guess is zero
>>>   tolerances:  relative=1e-07, absolute=1e-50, divergence=10000
>>>   left preconditioning
>>>   using PRECONDITIONED norm type for convergence test
>>> PC Object: 1 MPI processes
>>>   type: sor
>>>     SOR: type = local_symmetric, iterations = 1, local iterations = 1, omega = 1
>>>   linear system matrix = precond matrix:
>>>   Matrix Object:   1 MPI processes
>>>     type: seqaij
>>>     rows=1375920, cols=1375920
>>>     total: nonzeros=17671714, allocated nonzeros=17671714
>>>     total number of mallocs used during MatSetValues calls =0
>>>       not using I-node routines
>>> 
>>> Using Petsc Development HG revision: a4dae06b4d05ef5b78a9a9aa2cbc31b2b158834f  HG Date: Wed Feb 08 11:29:52 2012 -0600
>>> Configure options: --with-petsc-arch=openmpi-intel-complex-release-f-mkl --with-fortran-interfaces=1 --download-superlu --download-superlu_dist --download-mumps --download-parmetis --download-ptscotch --download-metis --with-scalapack-lib=/opt/intel/Compiler/11.1/072/mkl/lib/em64t/libmkl_scalapack_lp64.a --with-scalapack-include=/opt/intel/Compiler/11.1/072/mkl/include --with-blacs-lib=/opt/intel/Compiler/11.1/072/mkl/lib/em64t/libmkl_blacs_openmpi_lp64.a --with-blacs-include=/opt/intel/Compiler/11.1/072/mkl/include --with-mpi-dir=/opt/mpi/intel/openmpi-1.4.2 --with-scalar-type=complex --with-blas-lapack-lib="[/opt/intel/Compiler/11.1/072/mkl/lib/em64t/libmkl_intel_lp64.a,/opt/intel/Compiler/11.1/072/mkl/lib/em64t/libmkl_intel_thread.a,/opt/intel/Compiler/11.1/072/mkl/lib/em64t/libmkl_core.a,/opt/intel/Compiler/11.1/072/lib/intel64/libiomp5.a]" --with-precision=double --with-x=0 --with-debugging=0
>>> 
>>> 
>>> Well, two version compiled with different lines, but still I don't think this is the reason...
>>> Where actually to look at?
>>> 
>>> Thanks.
>>> 
>>> On 22.03.2012 15:42, Jed Brown wrote:
>>>> On Thu, Mar 22, 2012 at 04:23, Alexander Grayver<agrayver at gfz-potsdam.de>  wrote:
>>>> I've got the following error when applying bicg+sor to my problem:
>>>> 
>>>> mt-soft/solveTest>  ./solveTest -ksp_view -ksp_converged_reason -ksp_monitor_true_residual -log_summary -mat_type aij -ksp_rtol 1.0e-7 -ksp_type bicg -pc_type sor -ksp_max_it 750
>>>> [0]PETSC ERROR: --------------------- Error Message ------------------------------------
>>>> [0]PETSC ERROR: No support for this operation for this object type!
>>>> [0]PETSC ERROR: PC does not have apply transpose!
>>>> [0]PETSC ERROR: ------------------------------------------------------------------------
>>>> [0]PETSC ERROR: Petsc Development HG revision: 59ca71b85d784abbe22f12c34ffcb2ccc6dc68b0  HG Date: Tue Mar 20 01:05:13 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: Configure options --with-petsc-arch=openmpi-intel-complex-release-c --with-mpi-dir=/opt/mpi/intel/openmpi-1.4.2 --with-scalar-type=complex --with-precision=double --with-blas-lapack-dir=/usr/local/lib --with-x=0 --with-debugging=0
>>>> [0]PETSC ERROR: ------------------------------------------------------------------------
>>>> [0]PETSC ERROR: PCApplyTranspose() line 515 in /home/mt/agrayver/lib/petsc-dev/src/ksp/pc/interface/precon.c
>>>> [0]PETSC ERROR: KSPSolve_BiCG() line 55 in /home/mt/agrayver/lib/petsc-dev/src/ksp/ksp/impls/bicg/bicg.c
>>>> [0]PETSC ERROR: KSPSolve() line 434 in /home/mt/agrayver/lib/petsc-dev/src/ksp/ksp/interface/itfunc.c
>>>> [0]PETSC ERROR: main() line 114 in /home/solveTest.c
>>>> 
>>>> Any ideas?
>>>> 
>>>> PCApplyTranspose_SOR is not implemented. It is unfortunately not an operation that is efficient to implement in-place like SOR.
>>> 
>>> -- 
>>> Regards,
>>> Alexander
>>> 
> 
> 
> -- 
> Regards,
> Alexander
> 
> 