[petsc-users] about linear solver convergence

[behzad baghapour]

Dear all,

I set my Jacobian matrix in petsc and test it to ensure for correctness for
Jacobian and RHS function. ( also precondition = jacobian )
I have solved my problem before with some other solvers (gmers/ILU(2)) and
the convergence has been achieved within 15 - 16 iterations.

But in petsc the linear solver (ksp=GMRES) is not converged within this
number ( or may be converged in more than 700 iterations!!! ). I know that I
should have a mistake but I can't predict it?

Please help me what parts of petsc solver I should check?

Regards,
Behzad

-- 
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Behzad Baghapour
Ph.D. Candidate, Mechecanical Engineering
University of Tehran, Tehran, Iran
https://sites.google.com/site/behzadbaghapour
Fax: 0098-21-88020741
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