Do you ever get a problem with 'aij` ? Can you run in a loop with 'aij' to confirm it doesn't fail then?
Barry > On Jan 17, 2024, at 4:51 PM, Yesypenko, Anna <[email protected]> wrote: > > Dear Petsc users/developers, > > I'm experiencing a bug when using petsc4py with GPU support. It may be my > mistake in how I set up a AIJCUSPARSE matrix. > For larger matrices, I sometimes encounter a error in assigning matrix > values; the error is thrown in PetscHMapIJVQuerySet(). > Here is a minimum snippet that populates a sparse tridiagonal matrix. > > ``` > from petsc4py import PETSc > from scipy.sparse import diags > import numpy as np > > n = int(5e5); > > nnz = 3 * np.ones(n, dtype=np.int32); nnz[0] = nnz[-1] = 2 > A = PETSc.Mat(comm=PETSc.COMM_WORLD) > A.createAIJ(size=[n,n],comm=PETSc.COMM_WORLD,nnz=nnz) > A.setType('aijcusparse') > tmp = diags([-1,2,-1],[-1,0,+1],shape=(n,n)).tocsr() > A.setValuesCSR(tmp.indptr,tmp.indices,tmp.data) > ####### this is the line where the error is thrown. > A.assemble() > ``` > > The error trace is below: > ``` > File "petsc4py/PETSc/Mat.pyx", line 2603, in petsc4py.PETSc.Mat.setValuesCSR > File "petsc4py/PETSc/petscmat.pxi", line 1039, in > petsc4py.PETSc.matsetvalues_csr > File "petsc4py/PETSc/petscmat.pxi", line 1032, in > petsc4py.PETSc.matsetvalues_ijv > petsc4py.PETSc.Error: error code 76 > [0] MatSetValues() at > /work/06368/annayesy/ls6/petsc/src/mat/interface/matrix.c:1497 > [0] MatSetValues_Seq_Hash() at > /work/06368/annayesy/ls6/petsc/include/../src/mat/impls/aij/seq/seqhashmatsetvalues.h:52 > [0] PetscHMapIJVQuerySet() at > /work/06368/annayesy/ls6/petsc/include/petsc/private/hashmapijv.h:10 > [0] Error in external library > [0] [khash] Assertion: `ret >= 0' failed. > ``` > > If I run the same script a handful of times, it will run without errors > eventually. > Does anyone have insight on why it is behaving this way? I'm running on a > node with 3x NVIDIA A100 PCIE 40GB. > > Thank you! > Anna
