[petsc-users] Newbie question : iterative solver - algorithm and performance

[lixin chu]

Hello,New to PETSc, appreciate any help - 
I have done some experiment with MUMPS (the direct solver for sparse matrix), and very interested to try out PETSc now. I have a large sparse symmetric matrix (3 millions x 3 millions, complex data type).
Some questions I have:
- I am assuming that I should select one algorithm of "Krylov methods", which algorithm is a good option, GMRES, CG, or others ? (I am not a domain expert, but helping developing a program to test the matrix). - do all the algorithms support distributed architecture (multiple machines, multiple cores)- are there any performance test data ? (total run time for example)
 thank you very much,
LX
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