Re: [deal.II] Re: Conjugate Gradient for Schur complement, serial vs parallel discrepancy in solution and effect of tolerance.

2017-11-28 Thread Dimitris Ntogkas
d the overall behavior of the method, although the difference in the residual is still present. Thanks again for your help! On Monday, November 27, 2017 at 6:57:31 PM UTC-5, Bruno Turcksin wrote: > > Dimitris, > > 2017-11-27 17:10 GMT-05:00 Dimitris Ntogkas >: > >> Thanks for

[deal.II] Re: Conjugate Gradient for Schur complement, serial vs parallel discrepancy in solution and effect of tolerance.

2017-11-27 Thread Dimitris Ntogkas
the L infinity norm. > > Best, > > Bruno > > On Monday, November 27, 2017 at 3:31:07 PM UTC-5, Dimitris Ntogkas wrote: >> >> Dear all, >> >> I have a question with regards to the behavior of the Conjugate Gradient >> method in serial and parall

[deal.II] Conjugate Gradient for Schur complement, serial vs parallel discrepancy in solution and effect of tolerance.

2017-11-27 Thread Dimitris Ntogkas
Dear all, I have a question with regards to the behavior of the Conjugate Gradient method in serial and parallel. I am using version 8.5 of dealii and I have a parallel implementation based on Trilinos. The system matrix is in a block format and sparse, with blocks A, B, B^T and 0. The right h