[petsc-users] Pipelined solvers PIPECG etc fail

Matthew Knepley knepley at gmail.com
Thu Nov 20 07:17:33 CST 2014

On Thu, Nov 20, 2014 at 4:05 AM, Håkon Strandenes <haakon at hakostra.net>

> Hi,
> First: thanks to the list and Barry for solving my previous problem on
> loading vectors from HDF5 files. It works great!
> Now a second problem: I want to try the pipelined KSP solvers, PIPECG in
> particular. However, my program fails on the first KSPSolve() with the
> message below. The same happens if I try PIPECR.

These are very new, so there could be bugs lurking. It would help our
testing if this is
reproducuble on a standard example. Does this happen if you try to solve
KSP ex2
or SNES ex5 with PIPECG?



> I have tried this on three MPI implementations, on and two of them fully
> support MPI 3 (I have read http://www.mcs.anl.gov/petsc/
> documentation/faq.html#pipelined). I am using latest PETSc from Git repo.
> I have tried to turn off the preconditioner without any effect.
> The equation system is the result of a finite-volume discretization of a
> Poisson-like equation if that helps anything. A normal CG solver works like
> a charm, converging fast and effective.
> Are there any tricks to get this working? Anything special I have to set
> and/or define to get this solver running?
> Thanks in advance.
> Best regards,
> Håkon Strandenes
> Error message:
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Object is in wrong state
> [0]PETSC ERROR: Use KSPConvergedSkip() with KSPNormType of KSP_NORM_NONE
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.5.2, unknown
> [0]PETSC ERROR: madns on a arch-linux2-c-debug named hakostra-kontor by
> hakostra Thu Nov 20 11:04:28 2014
> [0]PETSC ERROR: Configure options --prefix=/opt/petsc/git-debug/install
> --with-shared-libraries --download-hypre --with-64-bit-indices --with-hdf5
> --with-hdf5-dir=/opt/HDF5/1.8.13/install --with-debugging
> --with-debugger=gdb
> [0]PETSC ERROR: #1 KSPConvergedDefault() line 710 in
> /opt/petsc/git-debug/source/src/ksp/ksp/interface/iterativ.c
> [0]PETSC ERROR: #2 KSPSolve_PIPECG() line 99 in
> /opt/petsc/git-debug/source/src/ksp/ksp/impls/cg/pipecg/pipecg.c
> [0]PETSC ERROR: #3 KSPSolve() line 459 in /opt/petsc/git-debug/source/
> src/ksp/ksp/interface/itfunc.c
> [0]PETSC ERROR: #4 findPressure() line 53 in /opt/MaDNS/source/src/FVM2.cpp

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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