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It turns out the fix is really easy. Here is a patch.<br>
<br>
Apply it with <br>
<br>
patch -p1 < barry-vtk.patch<br>
<br>
then do <br>
<br>
make gnumake<br>
<br>
all in $PETSC_DIR<br>
<br>
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> On Feb 28, 2018, at 9:07 AM, Danyang Su <danyang.su@gmail.com> wrote:<br>
> <br>
> Hi Matt，<br>
> <br>
> Thanks for your suggestion and I will use xmf instead. <br>
> <br>
> Regards,<br>
> <br>
> Danyang<br>
> <br>
> On February 28, 2018 3:58:08 AM PST, Matthew Knepley <knepley@gmail.com> wrote:<br>
> On Wed, Feb 28, 2018 at 12:39 AM, Smith, Barry F. <bsmith@mcs.anl.gov> wrote:<br>
> <br>
> Matt,<br>
> <br>
> I have confirmed this is reproducible and a bug. The problem arises because<br>
> <br>
> frame #0: 0x000000010140625a libpetsc.3.8.dylib`PetscViewerVTKAddField_VTK(viewer=0x00007fe66760c750, dm=0x00007fe668810820, PetscViewerVTKWriteFunction=(libpetsc.3.8.dylib`DMPlexVTKWriteAll at plexvtk.c:633), fieldtype=PETSC_VTK_POINT_FIELD, vec=0x00007fe66880ee20)
at vtkv.c:140<br>
> frame #1: 0x0000000101404e6e libpetsc.3.8.dylib`PetscViewerVTKAddField(viewer=0x00007fe66760c750, dm=0x00007fe668810820, PetscViewerVTKWriteFunction=(libpetsc.3.8.dylib`DMPlexVTKWriteAll at plexvtk.c:633), fieldtype=PETSC_VTK_POINT_FIELD, vec=0x00007fe66880ee20)
at vtkv.c:46<br>
> frame #2: 0x0000000101e0b7c3 libpetsc.3.8.dylib`VecView_Plex_Local(v=0x00007fe66880ee20, viewer=0x00007fe66760c750) at plex.c:301<br>
> frame #3: 0x0000000101e0ead7 libpetsc.3.8.dylib`VecView_Plex(v=0x00007fe66880e820, viewer=0x00007fe66760c750) at plex.c:348<br>
> <br>
> keeps a linked list of vectors that are to be viewed and the vectors are the same Vec because they are obtained with DMGetLocalVector().<br>
> <br>
> The safest fix is to have PetscViewerVTKAddField_VTK() do a VecDuplicate() on the vector passed in and store that in the linked list instead of just storing a pointer to the passed in vector (which might and can be overwritten before all the linked vectors
are actually stored).<br>
> <br>
> Danyang,<br>
> <br>
> Barry is right, and the bug can be fixed the way he says. However, this points out why VTK is bad format. I think a better choice is<br>
> to use HDF5 and XDMF. For example, in my code now I always use<br>
> <br>
> DMVIewFromOptions(dm, NULL, "-dm_view");<br>
> <br>
> and then later (perhaps several times)<br>
> <br>
> VecViewFromOptions(u, NULL, "-u_vec_view")<br>
> VecViewFromOptions(v, NULL, "-v_vec_view")<br>
> <br>
> and then on the command line<br>
> <br>
> -dm_view hdf5:test.h5 -u_vec_view hdf5:test.h5::append -v_vec_view hdf5:test.h5::append<br>
> <br>
> which produces a file<br>
> <br>
> test.h5<br>
> <br>
> Then I run<br>
> <br>
> $PETSC_DIR/bin/petsc_gen_xdmf.py test.h5<br>
> <br>
> which produces another file<br>
> <br>
> test.xmf<br>
> <br>
> This can be loaded by Paraview for visualization.<br>
> <br>
> Thanks,<br>
> <br>
> Matt<br>
> <br>
> <br>
> <br>
> Barry<br>
> <br>
> <br>
> <br>
> > On Feb 27, 2018, at 10:44 PM, Danyang Su <danyang.su@gmail.com> wrote:<br>
> ><br>
> > Hi All,<br>
> ><br>
> > How to set different object names when using multiple VecView? I try to use PetscObjectSetName with multiple output, but the object name is overwritten by the last one.<br>
> ><br>
> > As shown below, as well as the enclosed files as example, the vector name in sol.vtk is vec_v for both vector u and v.<br>
> ><br>
> > call PetscViewerCreate(PETSC_COMM_WORLD, viewer, ierr);CHKERRA(ierr)<br>
> > call PetscViewerSetType(viewer, PETSCVIEWERVTK, ierr);CHKERRA(ierr)<br>
> > call PetscViewerPushFormat(viewer, PETSC_VIEWER_ASCII_VTK, ierr);CHKERRA(ierr)<br>
> > call PetscViewerFileSetName(viewer, 'sol.vtk', ierr);CHKERRA(ierr)<br>
> ><br>
> > call PetscObjectSetName(u, 'vec_u', ierr);CHKERRA(ierr)<br>
> > call VecView(u, viewer, ierr);CHKERRA(ierr)<br>
> ><br>
> > call PetscObjectSetName(v, 'vec_v', ierr);CHKERRA(ierr)<br>
> > call VecView(v, viewer, ierr);CHKERRA(ierr)<br>
> ><br>
> > call PetscViewerDestroy(viewer, ierr);CHKERRA(ierr)<br>
> ><br>
> > call DMRestoreGlobalVector(dm, u, ierr);CHKERRA(ierr)<br>
> > call DMRestoreGlobalVector(dm, v, ierr);CHKERRA(ierr)<br>
> ><br>
> > Thanks,<br>
> ><br>
> > Danyang<br>
> ><br>
> > <ex1f90.F90><makefile.txt><sol.vtk><br>
> <br>
> <br>
> <br>
> <br>
> -- <br>
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
> -- Norbert Wiener<br>
> <br>
> <a href="https://www.cse.buffalo.edu/~knepley/">https://www.cse.buffalo.edu/~knepley/</a><br>
> <br>
> -- <br>
> Sent from my Android device with K-9 Mail. Please excuse my brevity.<br>
<br>
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