[petsc-users] Norm of RHS in BCGS

[Norihiro Watanabe]

Hi,

Is it correct that a norm of a preconditioned RHS vector is used to
compute a relative error in BCGS?

I'm testing BCGS + BoomerAMG. With "-info", PETSc says "initial right
hand side norm" is 2.223619476717e+10 (see below) but an actual norm
of the RHS I passed is 4.059007e-02. If yes, is there any way to get a
norm of a preconditioned RHS?


[0] KSPConvergedDefault(): Linear solver has converged. Residual norm
2.036064453512e-02 is less than relative tolerance 9.999999960042e-13
times initial right hand side norm 2.223619476717e+10 at iteration 6


Regards,
Nori

-- 
Norihiro Watanabe