[petsc-users] SLEPc GEVP for huge systems

[Jose E. Roman]

Are you getting an error from MUMPS or from BV? What is the error message you get? What is the size of the matrix? How many eigenvalues do you need to compute?

In principle you can use any KSP+PC, see section 3.4.1 of the users manual. If you have a good preconditioner, then an alternative to Krylov methods is to use Davidson-type methods https://doi.org/10.1145/2543696 - in some cases these can be competitive.

Jose


> El 19 nov 2019, a las 17:06, Yann Jobic via petsc-users <petsc-users at mcs.anl.gov> escribió:
> 
> Hi all,
> I'm trying to solve a huge generalize (unsymetric) eigen value problem with SLEPc + MUMPS. We actually failed to allocate the requested memory for MUMPS factorization (we tried BVVECS).
> We would like to know if there is an alternate iterative way of solving such problems.
> Thank you,
> Best regards,
> Yann