[petsc-users] Direct linear solver in Petsc

[Qin Lu]

Hello,
I plan to solve a small sparse linear equation system using the direct solver, since the number of unknowns is small (less than 1000). Here I got a few questions:
1. Is there a general guide line on the size of the system that direct solver is more efficient than iterative solver?2. Is the native Petsc direct solver (using KSPPREONLY and PCLU) designed to solve dense system or sparse system?3. Is the native Petsc direct solver comparable to SuperLU and MUMPS in performance? Do they use different algorithms?
Thanks in advance for your help.
Best Regards,Qin
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