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. Some issues we found is that 1) for a * x = 0 it doesn't return x = 0 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*
