<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div>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.</div><div><br></div><div>That said, you can experiment with FETI-DP only after having setup a BDDC preconditioner with the options and customization you prefer.</div><div>Use <a href="http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/KSP/index.html">http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/KSP/index.html</a> for manual pages.</div><div> </div><div>For an 'how to' with FETIDP, please see src/ksp/ksp/examples/tutorials/ex.59.c as Jed told you, specifically look at <span style="background-color: rgb(255, 255, 255); line-height: 1.4;">C</span><span style="background-color: rgb(255, 255, 255);"><span style="line-height: 1.4;">omputeKSPFETIDP for obtaining the FETIDP matrix F (implemented Matrix-free) and the optimal FETIDP dirichlet preconditioner. Once you have F, y</span></span><span style="line-height: 1.4; background-color: rgb(255, 255, 255);">ou 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.</span></div><div><span style="background-color: rgb(255, 255, 255);"><span style="line-height: 1.4;"><br></span></span></div><div><span style="background-color: rgb(255, 255, 255);"><span style="line-height: 1.4;">I would recommend </span><span style="line-height: 1.4;">you to use the development version of the library and either use the </span><span style="line-height: 16px;">‘</span><span style="line-height: 1.4;">next</span><span style="line-height: 16px;">’</span><span style="line-height: 1.4;"> branch or the </span><span style="line-height: 16px;">‘</span><span style="line-height: 1.4;">master' branch after having merged in the branch stefano_zampini/pcbddc-primalfixes. </span></span><span style="line-height: 1.4;">Note that </span><span style="line-height: 16px;">‘</span><span style="line-height: 1.4;">next</span><span style="line-height: 16px;">’</span><span style="line-height: 1.4;"> also contains the </span><span style="line-height: 16px;">new</span><span style="line-height: 1.4;"> deluxe scaling operator for BDDC which is not available to use with FETI-DP.</span></div><div><br></div><div>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.</div><div><br></div><div>Stefano</div><div><div><div><br></div><div><br></div><div>On Sep 3, 2014, at 5:19 PM, Jed Brown <<a href="mailto:jed@jedbrown.org">jed@jedbrown.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> writes:<br><blockquote type="cite"><blockquote type="cite">1- Is it possible to complete a FETI-DP solution with the provided<br>functions in current PetSc release?<br><br></blockquote><br>There is no FETI-DP in PETSc. <br></blockquote><br>Wrong. There is PCBDDC, which has the same eigenvalues as FETI-DP. You<br>can enable it by configuring --with-pcbddc. This will be turned on by<br>default soon. It is fairly new, so you should use the branch 'master'<br>instead of the release. It has an option to do FETI-DP instead of BDDC.<br>See src/ksp/ksp/examples/tutorials/ex59.c.<br><br>For either of these methods, you have to assemble a MATIS. If you use<br>MatSetValuesLocal, most of your assembly code can stay the same.<br><br>Hopefully we can get better examples before the next release. Stefano<br>(the author of PCBDDC, Cc'd) tests mostly with external packages, but we<br>really need more complete tests within PETSc.<br></blockquote></div><br></div></body></html>