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? > 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
