[petsc-users] Preconditioner for LSQR

Lucas Banting bantingl at myumanitoba.ca
Mon Feb 28 17:54:09 CST 2022


I have an MPIDENSE matrix of size about 200,000 x 200, using KSPLSQR on my machine a solution takes about 15 s. I typically run with six to eight processors.
I have to solve the system several times, typically 4-30, and was looking for recommendations on reusable preconditioners to use with KSPLSQR to increase speed.

Would it make the most sense to use PCCHOLESKY on the smaller system A^T * A?

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