Hello,

I’ve seen that the functions cusparsennz_compress() and cusparseXpruneCsr2csr() are marked as deprecated. My understanding is that these functions will be removed in the next major release so I thought I should explain why these functions are important for the geophysical problems I’m dealing with.

The most computationally challenging problem in geophysics is to solve a linear equation such as Ax=b to obtain the vector x. In this equation set, b is a dense vector and A is a sparse matrix obtained by numerical methods such as finite differences or finite elements. Especially for finite elements, creating the sparse matrix A could be very time-consuming and for that reason, I use GPUs to create this sparse matrix in addition to solving the equations.

In my algorithm, while building this sparse matrix on a GPU in CSR format, I have to add some zero-valued entries into the sparse matrix (due to my implementation detail). Afterward, I remove those zero entries with using the nnz_compress or pruneCsr2csr functions. So these functions are very crucial for me, if they are not replaced with something else, I believe I cannot build my sparse matrices on GPUs.

In short, I’d like to report that these functions are very useful for my case and I want to be able to use them in the future.

Regards

Deniz