[petsc-users] KrylovSchur solver diverges when setting EPS_GHEP

[Jose E. Roman]

El 07/11/2014, a las 15:10, Denis Davydov escribió:

> Dear all, 
> 
> I was trying to set the problem type to EPS_GHEP as 
> the matrices in the considered generalised eigenvalue problem are real and symmetric. 
> However, this breaks the solver's convergence as compared to the default, non-symmetric case. 
> The residual is quite small (~1e-9). I am puzzled why this happens.
> 
> The output with -eps_view -esp_monitor_all flags is below.
> 
> Thank you in advance for any advices on the issue.
> 
> Kind regards,
> Denis 
> 

What do you mean by 'breaks convergence'? Are you sure your matrices are symmetric?
Jose