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 <[email protected]> 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 <[email protected]> wrote: > > Matthew Knepley <[email protected]> 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. > > >
