[petsc-users] EPS monitor

[Jose E. Roman]

> El 16 ago 2017, a las 21:36, Kong, Fande <fande.kong at inl.gov> escribió:
> 
> Hi All,
> 
> How to understand the following messages:
> 
>   1 EPS nconv=0 first unconverged value (error) 2.06312 (3.29164033e-01)
>   2 EPS nconv=0 first unconverged value (error) 2.03951 (1.76223074e-01)
>   3 EPS nconv=0 first unconverged value (error) 2.01177 (5.71109559e-02)
>   4 EPS nconv=0 first unconverged value (error) 2.01042 (4.84609300e-02)
>   5 EPS nconv=0 first unconverged value (error) 2.00708 (3.19917457e-02)
>   6 EPS nconv=0 first unconverged value (error) 2.00595 (2.62792109e-02)
>   7 EPS nconv=0 first unconverged value (error) 2.00504 (2.13766150e-02)
>   8 EPS nconv=0 first unconverged value (error) 2.00441 (1.85066774e-02)
>   9 EPS nconv=0 first unconverged value (error) 2.00397 (1.73188449e-02)
>  10 EPS nconv=0 first unconverged value (error) 2.00366 (1.54528517e-02)
>  11 EPS nconv=0 first unconverged value (error) 2.00339 (1.32215899e-02)
>  12 EPS nconv=0 first unconverged value (error) 2.00316 (1.32215899e-02)
>  13 EPS nconv=0 first unconverged value (error) 2.00316 (1.17928920e-02)
>  14 EPS nconv=0 first unconverged value (error) 2.00297 (1.04964387e-02)
>  15 EPS nconv=0 first unconverged value (error) 2.0028 (9.58244972e-03)
>  16 EPS nconv=0 first unconverged value (error) 2.00268 (9.06634973e-03)
>  17 EPS nconv=0 first unconverged value (error) 2.00198 (3.43444441e-04)
>  18 EPS nconv=1 first unconverged value (error) 2.25718 (1.79769313e+308)
>  18 EPS converged value (error) #0 2.00197 (5.69451918e-09)
> 
> 
> When the solver converged, the wrong eigenvalue and the wrong residual are printed out. Do we design like this way? 
> 
> Fande,

Is this the POWER solver? Most solvers in EPS approximate several eigenvalues simultaneously, but this is not the case in POWER - when one eigenvalue converges there is no approximation available for the next one.

I will think about a simple fix.

Jose