[petsc-dev] Errors with DM & PCSHELL

[Mark Adams]

On Fri, May 29, 2015 at 2:03 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> > On May 29, 2015, at 10:32 AM, Mark Adams <mfadams at lbl.gov> wrote:
> >
> > I am getting errors in code that I thought was working ...
> >
> > I create a PC shell like so:
> >
> >   ! set shell PC
> >   call SNESGetKSP(solver%snes,innerksp,ierr)
> >   call KSPGetPC(innerksp,spc,ierr)
> >   call PCSetType(spc,PCSHELL,ierr) ! overriding opions !!!
> >   call PCShellSetApply(spc,PCShermanMorrisonApply,ierr)
> >   call PCSetApplicationContext(spc,solver,ierr)
> >
> > and in PCShermanMorrisonApply I have:
> >
> >   call PCGetApplicationContext(pc,solver,ierr)
> >   call
> DMCompositeGetAccessArray(solver%da,xin,itwo,PETSC_NULL_INTEGER,Xsub,ierr)
> >   call
> DMCompositeGetAccessArray(solver%da,yout,itwo,PETSC_NULL_INTEGER,Ysub,ierr)
> >   call PCFieldSplitGetSubKSP(solver%pc,PETSC_NULL_INTEGER,subksp,ierr)
> >   call KSPSolve(subksp(1),Xsub(1),Ysub(1),ierr)
> >   call MatMult(solver%Cmat,Ysub(1),Xsub(2),ierr) ! ignoring <> input
> >
> > I get an error on this last statement about a vector being locked.
>
>    What vector? the Xsub(2) vector?
>

Yes, arg #3


>    Based on the names of the variable I am guessing that xin is the input
> vector to your Apply() hence it is read only. Thus Xsub is read only, but
> you are trying to put the results of a MatMult() int Xsub(2) which is
> completely wrong. You cannot use Xsub for work space because it will
> corrupt the outer solver.
>
> >  There does not seem to be:
> >
> > call DMCompositeGetAccessArrayRead( ...
>
>    There doesn't need to be. Internally the DMCompositeGetAccessArray()
> will make the subvectors read only if the large vector is read only.
>

OK, but I am getting an error.  This is it. Line 2218 here is (not clear
what is going on here, a macro?):

  VecLocked(y,3);

[8]PETSC ERROR:  Vec is locked read only, argument # 3
[8]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
trouble shooting.
[8]PETSC ERROR: Petsc Development GIT revision: v3.5.4-3050-g7d7ead0  GIT
Date: 2015-05-28 23:28:47 -0500
[8]PETSC ERROR: /global/homes/m/madams/epsi/XGC1_3/xgc-es on a
arch-xc30-dbg-intel named nid05966 by madams Fri May 29 12:56:27 2015
[8]PETSC ERROR: Configure options --COPTFLAGS="-no-ipo -g -O0"
--CXXOPTFLAGS="-no-ipo -g -O0" --FOPTFLAGS="-no-ipo -g -O0"
--download-parmetis --download-metis --with-cc=cc --with-clib-autodetect=0
--with-cxx=CC --with-cxxlib-autodetect=0 --with-debugging=1 --with-fc=ftn
--with-fortranlib-autodetect=0
--with-hdf5-dir=/opt/cray/hdf5-parallel/1.8.13/intel/140/
--with-shared-libraries=0 --with-x=0 --with-mpiexec=aprun LIBS=-lstdc++
PETSC_ARCH=arch-xc30-dbg-intel
[8]PETSC ERROR: #1 MatMult() line 2218 in
/global/u2/m/madams/petsc/src/mat/interface/matrix.c



>
> >
> > I thought I fixed this problem ... or at least one like it.
> >
> > Mark
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20150529/82031bb7/attachment.html>