[cuSolver] Avoid repeated ctxCreate/Destroy for all Lapack API calls. #298
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* Apply the same logic as cuBlas to cuSolver at placedContext_. Avoid calling cuCtxCreate every time when using multiple lapck APIs. * Fix deprecation warnings from cuda.hpp for cuSolver (uxlfoundation#295). * Fix the bug in dft (mklgpu => mklcpu).
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Description
Mainly improve the performance of Lapack for CUDA backend by avoiding repeated cuCtxCreate/Destroy calls.
Apply the same logic as cuBlas to cuSolver at placedContext_.
This could avoid calling cuCtxCreate & cuCtxDestroy every time when using multiple lapck APIs.
For example, when solving Ax=b with Cholesky factorization, one needs to use both lapack::potrf & lapack::potrs APIs.
cuCtxCreate/Destroy takes much longer than most GPU lapack kernels, see the below images from nvvp diagnostics:
Before modification:
After modification:
Fix deprecation warnings from cuda.hpp for cuSolver ([BLAS] fix deprecation warnings from cuda.hpp #295).
Fix the bug in dft (mklgpu => mklcpu).
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Do all unit tests pass locally? Attach a log.
unit_test_lapack.txt
unit_test_rand.txt
unit_test_blas.txt
Have you formatted the code using clang-format?