[petsc-users] HashMap Error when populating AIJCUSPARSE matrix

[Barry Smith]

   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 <anna at oden.utexas.edu> 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

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