[petsc-users] FETI-DP implementation and call sequence

[Alp Kalpalp]

ok, so it is clear now, thank you


On Thu, Sep 4, 2014 at 3:07 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>    If you are referring to https://bitbucket.org/petsc/petsc-dev please
> ignore it; that it is an outdated item that should have been removed a long
> time ago. Sorry for the confusion.
>
>    You should start with the git repository
> https://bitbucket.org/petsc/petsc that should have all the branches you
> need.
>
>   Barry
>
>
> On Sep 4, 2014, at 6:42 AM, Alp Kalpalp <alpkalpalp at gmail.com> wrote:
>
> > Hi,
> >
> > Although I am experienced on C++ development on windows by using SVN, I
> need to learn too much things to use this algorithm I think.(petsc,
> debugging in linux, git, hg etc.)
> > So, sorry for the rookie questions in advance.
> >
> > You suggested me to use development version ----> petsc-dev (I believe I
> will compile and use it similar to petsc version of it), however it seems
> it has no branch named as "master", "next" or
> "stefano_zampini/pcbddc-primalfixes"
> >
> > These branches exist in "petsc" repo. Is it possible to merge petsc-dev
> and "stefano_zampini/pcbddc-primalfixes"
> > petsc-dev is hg, petsc is git !
> >
> > or am I get it totaly wrong! I am confused.
> >
> > Could someone explain me the development hierarchy in petsc? what is
> petsc-dev and why it has no branches?
> >
> >
> > On Wed, Sep 3, 2014 at 6:18 PM, Stefano Zampini <
> stefano.zampini at gmail.com> wrote:
> > FETIDP is in PETSc as a byproduct of the BDDC preconditioner (one is the
> dual of the other) and it does not have its own classes so far.
> >
> > That said, you can experiment with FETI-DP only after having setup a
> BDDC preconditioner with the options and customization you prefer.
> > Use
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/KSP/index.html
> for manual pages.
> >
> > For an 'how to' with FETIDP, please see
> src/ksp/ksp/examples/tutorials/ex.59.c as Jed told you, specifically look
> at ComputeKSPFETIDP for obtaining the FETIDP matrix F (implemented
> Matrix-free) and the optimal FETIDP dirichlet preconditioner. Once you have
> F, you can use PCBDDCMatFETIDPGetRHS and PCBDDCMatFetiDPGetSolution to
> obtain a right-hand side for the FETIDP system and a physical solution from
> the solution of the FETIDP system.
> >
> > I would recommend you to use the development version of the library and
> either use the ‘next’ branch or the ‘master' branch after having merged in
> the branch stefano_zampini/pcbddc-primalfixes. Note that ‘next’ also
> contains the new deluxe scaling operator for BDDC which is not available to
> use with FETI-DP.
> >
> > If you have any other questions which can be useful for other PETSc
> users, please use the mailing list; otherwise you can contact me personally.
> >
> > Stefano
> >
> >
> > On Sep 3, 2014, at 5:19 PM, Jed Brown <jed at jedbrown.org> wrote:
> >
> >> Matthew Knepley <knepley at gmail.com> writes:
> >>>> 1- Is it possible to complete a FETI-DP solution with the provided
> >>>> functions in current PetSc release?
> >>>>
> >>>
> >>> There is no FETI-DP in PETSc.
> >>
> >> Wrong.  There is PCBDDC, which has the same eigenvalues as FETI-DP.  You
> >> can enable it by configuring --with-pcbddc.  This will be turned on by
> >> default soon.  It is fairly new, so you should use the branch 'master'
> >> instead of the release.  It has an option to do FETI-DP instead of BDDC.
> >> See src/ksp/ksp/examples/tutorials/ex59.c.
> >>
> >> For either of these methods, you have to assemble a MATIS.  If you use
> >> MatSetValuesLocal, most of your assembly code can stay the same.
> >>
> >> Hopefully we can get better examples before the next release.  Stefano
> >> (the author of PCBDDC, Cc'd) tests mostly with external packages, but we
> >> really need more complete tests within PETSc.
> >
> >
>
>
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