How to moniter SLEPcEigenSolver?

Linear Algebra
1

Hi everyone

I am new to eigenvalue problem and eigenvalue solver. I want to use the library SLEPc properly such as convergence messages, the number of iterations, etc. I found a command in SLEPc user manual, i.e.

EPSMonitorSet() (page 31),

but I do not know how to call it with Fenics.

If you have any ideas about this problem, please let me know.

Best regards

2

You could try changing the LogLevel, see

3

Hi dokken

Thank you for your reply. I have tried your suggestion set_log_level(LogLevel.TRACE). However, what I need is message at each iteration, like what we have with Newton Solver:

“Newton iteration 88: r (abs) = 2.193e-03 (tol = 1.000e-10) r (rel) = 1.081e-04 (tol = 1.000e-04)
Newton iteration 89: r (abs) = 2.013e-03 (tol = 1.000e-10) r (rel) = 9.926e-05 (tol = 1.000e-04)”

My actual code:
eigensolver = SLEPcEigenSolver(K, M)

pmr = eigensolver.parameters
pmr[‘problem_type’] = ‘gen_hermitian’ # needed
pmr[‘spectral_transform’] = ‘shift-and-invert’ # needed
pmr[‘spectral_shift’] = 0.0
pmr[“tolerance”] = 1e-12
pmr[“solver”] = “krylov-schur”

eigensolver.solve(10)

Best regards