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Fix CUDA block-sparse matrix-vector product contribution routing #2813

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Fix CUDA block-sparse matrix-vector product contribution routing #2813

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7 changes: 2 additions & 5 deletions Common/src/linear_algebra/CSysMatrixGPU.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -43,16 +43,13 @@ __global__ void GPUMatrixVectorProductAdd(matrixType* matrix, vectorType* vec, v

if(row<nPointDomain && threadNo<activeThreads)
{
vectorType res = 0.0;

for(int index = d_row_ptr[row] * nVar * nEqn + threadNo; index < d_row_ptr[row+1] * nVar * nEqn; index+=activeThreads)
{
int blockCol = index%nEqn;
int blockNo = index/(nVar * nEqn);
res += matrix[index] * vec[(d_col_ind[blockNo])*nVar + blockCol];
int trueBlockRow = (index % (nVar * nEqn)) / nEqn;
atomicAdd(&prod[row * nVar + trueBlockRow], matrix[index] * vec[(d_col_ind[blockNo])*nVar + blockCol]);
}

atomicAdd(&prod[row * nVar + blockRow], res);
}
}

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