If you do your own partitioning, you need to use VecLoadIntoVector() with a Vec you get from the DA.
Matt On Tue, Mar 9, 2010 at 5:16 PM, (Rebecca) Xuefei YUAN <xy2102 at columbia.edu>wrote: > Hi, > > I ran np=4 for a small (-da_grid_x 6, -da_grid_y 5) problem, with > PETSC_STENCIL_BOX and width=2, dof = 4. > > When I use vecLoad() to load the binary file with the following set: > > PetscViewerBinaryOpen(PETSC_COMM_WORLD,fileName,FILE_MODE_READ,&viewer); > VecLoad(viewer,PETSC_NULL,&FIELD); > ierr = DAVecGetArray(da2_4,FIELD,&field);CHKERRQ(ierr); > > ierr = DAVecRestoreArray(da2_4,FIELD,&field);CHKERRQ(ierr); > ierr = VecDestroy(FIELD);CHKERRQ(ierr); > ierr = DADestroy(da2_4);CHKERRQ(ierr); > ierr = PetscViewerDestroy(viewer);CHKERRQ(ierr); > > However, I got the error messages as below: > > [0]PETSC ERROR: DAVecGetArray() line 53 in src/dm/da/src/dagetarray.c > Vector local size 32 is not compatible with DA local sizes 36 100 > > [1]PETSC ERROR: DAVecGetArray() line 53 in src/dm/da/src/dagetarray.c > Vector local size 32 is not compatible with DA local sizes 36 100 > > [2]PETSC ERROR: DAVecGetArray() line 53 in src/dm/da/src/dagetarray.c > Vector local size 28 is not compatible with DA local sizes 24 80 > > [3]PETSC ERROR: DAVecGetArray() line 53 in src/dm/da/src/dagetarray.c > Vector local size 28 is not compatible with DA local sizes 24 80 > > Then I tracked down and tried to find how this 32,32,28,28 coming from. > > It turns out that my da2_4 has the parameters at each processor: > > > xs xe ys ye x y Xs Xe Ys Ye Nl base nlocal Nlocal > p0: 0 12 0 3 12 3 0 20 0 5 100 0 100 36 > p1: 12 24 0 3 12 3 4 24 0 5 100 36 100 36 > p2: 0 12 3 5 12 2 0 20 1 5 80 72 80 24 > p3: 12 24 3 5 12 2 4 24 1 5 80 96 80 24 > > and deep in > > #0 PetscSplitOwnership (comm=-2080374782, n=0x8a061b4, N=0x8a061b8) > at psplit.c:81 > #1 0x08628384 in PetscLayoutSetUp (map=0x8a061b0) at pmap.c:140 > #2 0x08618320 in VecCreate_MPI_Private (v=0x8a05c50, alloc=PETSC_TRUE, > nghost=0, array=0x0) at pbvec.c:182 > #3 0x08618ba7 in VecCreate_MPI (vv=0x8a05c50) at pbvec.c:232 > #4 0x085f1554 in VecSetType (vec=0x8a05c50, method=0x885dd0b "mpi") > at vecreg.c:54 > #5 0x085ec4f0 in VecSetTypeFromOptions_Private (vec=0x8a05c50) > at vector.c:1335 > #6 0x085ec909 in VecSetFromOptions (vec=0x8a05c50) at vector.c:1370 > #7 0x085d7a7e in VecLoad_Binary (viewer=0x89f70b0, itype=0x885ce3d "mpi", > newvec=0xbfe148e4) at vecio.c:228 > #8 0x085d70e4 in VecLoad (viewer=0x89f70b0, outtype=0x885ce3d "mpi", > newvec=0xbfe148e4) at vecio.c:134 > #9 0x0804f140 in FormInitialGuess_physical (dmmg=0x89a2880, X=0x89b34f0) > at vecviewload_out.c:390 > #10 0x08052ced in DMMGSolve (dmmg=0x89a2720) at damg.c:307 > #11 0x0804d479 in main (argc=-1, argv=0xbfe14cd4) at vecviewload_out.c:186 > > it says that > > *n = *N/size + ((*N % size) > rank); > > where *N = 30; size = 4; rank = 0,1,2,3, in such a case, this gives me > > *n = 32,32,28,28 for pro0,1,2,3, separately. > > Where could be wrong with this mismatch of the local vector size and da > local size(excluding ghost pts or including ghost pts)? > > Thanks so much! > > Rebecca > > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20100309/4bf39343/attachment.htm>
