On Wed, Jan 21, 2015 at 2:36 PM, Matthew Knepley <[email protected]> wrote:
> On Wed, Jan 21, 2015 at 2:29 PM, Chung-Kan Huang <[email protected]> > wrote: > >> >> On Wed, Jan 21, 2015 at 2:15 PM, Matthew Knepley <[email protected]> >> wrote: >> >>> On Wed, Jan 21, 2015 at 2:07 PM, Chung-Kan Huang <[email protected]> >>> wrote: >>> >>>> >>>> On Wed, Jan 21, 2015 at 2:01 PM, Matthew Knepley <[email protected]> >>>> wrote: >>>> >>>>> On Wed, Jan 21, 2015 at 1:55 PM, Chung-Kan Huang <[email protected]> >>>>> wrote: >>>>> >>>>>> >>>>>> On Wed, Jan 21, 2015 at 1:44 PM, Matthew Knepley <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> On Wed, Jan 21, 2015 at 1:40 PM, Chung-Kan Huang <[email protected] >>>>>>> > wrote: >>>>>>> >>>>>>>> Then A & AB are not longer the same matrix. They become complete >>>>>>>> two individuals aren't they? >>>>>>>> If I do whatever to AB after AB is created the A is still the same >>>>>>>> old A and not going to be affected by the operations I do to AB. >>>>>>>> >>>>>>> >>>>>>> Yes. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> What I am really looking for is a way to create two interfaces (one >>>>>>>> as AIJ and one as BAIJ) but they both refer to the same matrix. >>>>>>>> >>>>>>> >>>>>>> Why would you ever want this? Why not just using BAIJ? >>>>>>> >>>>>> As I mentioned in the beginning. There are parts of the code gets >>>>>> benifit when AIJ is used and the other part gets benifit if BAIJ is >>>>>> used. >>>>>> >>>>>> For instance, >>>>>> >>>>>> I'd like to use MatSetValuesBlocked but I also want to use ilu >>>>>> constructed by AIJ instead of BAIJ (our experience found ilu from BAIJ >>>>>> behaves funny sometimes. >>>>>> >>>>> >>>>> If the blocks truly are dense, then ILU(0) is identical on both. >>>>> >>>> >>>> Unfortunately the life is not that easy. The blocks are spares and we >>>> found ILU(1) works better for our case. >>>> And besides that is not the only reason I want to have AIJ & BAIJ >>>> interfaces, we have some code management issue and I am looking for short >>>> cut to unite them. >>>> >>>> So go back to the original question the short answer is no way? >>>> >>> >>> Yes, it would not make sense. >>> >>> What problem are you using ILU(1) for? >>> >> >> I am using it for flow simulation for reservoir problems. >> > > Have you considered trying algebraic multigrid? > I am solving PDE fully implicitly and as far as I know algebraic multigrid only good for pressure equations I will need 2 stages PC while AMG is for pressure stage but I will still need something like ILU for second stage. > > >> Some issues we found is that >> 1) for a * x = 0 it doesn't return x = 0 >> > > This is impossible. There must be a bug in the code. > > Thanks, > > Matt > > >> 2) After compared ILU(1) with BAIJ against with ILU(1) with AIJ I found >> latter one is better. I could not find anything wrong with my BAIJ version >> though. However, experiences suggested that BAIJ's ILU(1) should be better. >> >> >> Thanks, >> >> Kan >> >>> >>> Thanks, >>> >>> Matt >>> >>> >>>> Thanks, >>>> >>>> Kan >>>> >>>>> >>>>> Matt >>>>> >>>>> >>>>>> Thanks, >>>>>> >>>>>> Kan >>>>>> >>>>>>> >>>>>>> Thanks, >>>>>>> >>>>>>> Matt >>>>>>> >>>>>>> >>>>>>>> Thanks, >>>>>>>> >>>>>>>> Kan >>>>>>>> On Wed, Jan 21, 2015 at 1:20 PM, Matthew Knepley <[email protected] >>>>>>>> > wrote: >>>>>>>> >>>>>>>>> On Wed, Jan 21, 2015 at 12:56 PM, Chung-Kan Huang < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> Hi, >>>>>>>>>> >>>>>>>>>> So if I do >>>>>>>>>> >>>>>>>>>> Mat A, AB; >>>>>>>>>> MatCreateAIJ(comm,m,n,M,N,d_nz, d_nnz,o_nz, o_nnz, &A); >>>>>>>>>> MatConvert(A, MATBAIJ, MAT_INITAL_MATRIX, &AB); >>>>>>>>>> MatSetBlockSize(AB, bs) >>>>>>>>>> I can create AB as a BAIJ with block size of bs from A which is a >>>>>>>>>> AIJ matrix. >>>>>>>>>> >>>>>>>>>> So from this point I can use both A and AB and they will mean the >>>>>>>>>> same matrix. Am I right? >>>>>>>>>> >>>>>>>>> >>>>>>>>> Yes >>>>>>>>> >>>>>>>>> >>>>>>>>>> At the end of the program do I only destory one of them or both? >>>>>>>>>> >>>>>>>>> >>>>>>>>> Both >>>>>>>>> >>>>>>>>> >>>>>>>>>> Do I need to worry about anything in terms of memory penalty? >>>>>>>>>> >>>>>>>>> >>>>>>>>> It is twice the memory. Its another matrix. >>>>>>>>> >>>>>>>>> Did you catch when Jed said you could jsut create the BAIJ up >>>>>>>>> front? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> >>>>>>>>> Matt >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Thanks, >>>>>>>>>> >>>>>>>>>> Kan >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Tue, Jan 20, 2015 at 4:39 PM, Barry Smith <[email protected]> >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> You can do a MatConvert() (requires another copy of the >>>>>>>>>>> matrix) for the parts that benefit from BAIJ. >>>>>>>>>>> >>>>>>>>>>> Barry >>>>>>>>>>> >>>>>>>>>>> > On Jan 20, 2015, at 4:33 PM, Chung-Kan Huang < >>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>> > >>>>>>>>>>> > Hi, >>>>>>>>>>> > >>>>>>>>>>> > Does PETSc provide means for conversion between AIJ & BAIJ. >>>>>>>>>>> > >>>>>>>>>>> > My matrix is created as AIJ because it makes life easy for >>>>>>>>>>> most part of the applications but some part of applications >>>>>>>>>>> actually get >>>>>>>>>>> some benefits with BAIJ. So I wonder if a matrix can exist as two >>>>>>>>>>> idenfities and I can use either format depend on which one is more >>>>>>>>>>> convenient at run time. >>>>>>>>>>> > >>>>>>>>>>> > So in my case the block size is fixed and identical for all >>>>>>>>>>> blocks. >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> > Thanks, >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> > Kan >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> >>>>>>>>>> *Cheers* >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> What most experimenters take for granted before they begin their >>>>>>>>> experiments is infinitely more interesting than any results to which >>>>>>>>> their >>>>>>>>> experiments lead. >>>>>>>>> -- Norbert Wiener >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> >>>>>>>> *Cheers* >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> What most experimenters take for granted before they begin their >>>>>>> experiments is infinitely more interesting than any results to which >>>>>>> their >>>>>>> experiments lead. >>>>>>> -- Norbert Wiener >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> *Cheers* >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> What most experimenters take for granted before they begin their >>>>> experiments is infinitely more interesting than any results to which their >>>>> experiments lead. >>>>> -- Norbert Wiener >>>>> >>>> >>>> >>>> >>>> -- >>>> >>>> *Cheers* >>>> >>> >>> >>> >>> -- >>> What most experimenters take for granted before they begin their >>> experiments is infinitely more interesting than any results to which their >>> experiments lead. >>> -- Norbert Wiener >>> >> >> >> >> -- >> >> *Cheers* >> > > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > -- *Cheers*
