Jose Now that we have the PCMatApply interface, you could switch to use that inside SLEPc. I guess you are using MatSolve, right? If not, the alternative is to have a PCFactorGetMatrix with creates on the fly an object that behaves like it. The problem is that we do not have a matching restore, and the new object created will be leaked. What do you think?
> On Nov 19, 2021, at 12:41 PM, Jose E. Roman <[email protected]> wrote: > > It is trying to call PCFactorGetMatrix() on your PC, but this operation is > not supported by PCSHELL and it is not possible to set it via > PetscObjectComposeFunction(). PCSHELL uses the PCShellSet* interface, that is > restricted to a limited number of operations. > > Jose > > >> El 19 nov 2021, a las 6:30, Sam Guo <[email protected]> escribió: >> >> Dear PETSc dev team, >> I am implementing SLEPc interval option using shell matrix as follows: >> >> EPSGetST(eps, &st); >> STSetType(st, STSINVERT); >> STGetKSP(st, &ksp); >> KSPSetOperators(ksp, A, A); >> KSPSetType(ksp, KSPPREONLY); >> KSPGetPC(ksp, &pc); >> KSPGetPC(ksp, &pc) >> MatSetOption(A, MAT_SPD, PETSC_TRUE); >> PCSetType(pc, PCSHELL); >> PCShellSetContext(pc, &appCtx); >> PCShellSetApply(pc, applyPreconditioner); >> PetscObjectComposeFunction((PetscObject)pc,"PCFactorGetZeroPivot_C",PCFactorGetZeroPivot_C); >> >> When I run it, I get the following error. Any idea what I did wrong? Thanks >> a lot for your help. >> >> [0]PETSC ERROR: No support for this operation for this object type >> [0]PETSC ERROR: PC type does not support getting factor matrix >> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for >> trouble shooting. >> [0]PETSC ERROR: Petsc Release Version 3.11.3, Jun, 26, 2019 >> [0]PETSC ERROR: Unknown Name on a arch-starccmplus_serial_real named >> pl2usbvu0037pc.net.plm.eds.com by cd4hhv Thu Nov 18 21:11:45 2021 >> Number of iterations of the method: 0 >> [0]PETSC ERROR: Configure options --with-x=0 --with-fc=0 --with-debugging=1 >> --with-blaslapack-dir=/u/cd4hhv/dev2/mkl/2017.2-cda-001/linux/lib/intel64/../.. >> --with-mpi=0 -CFLAGS=-g -CXXFLAGS=-g --with-clean=1 --force >> --with-scalar-type=real >> [0]PETSC ERROR: #1 PCFactorGetMatrix() line 1332 in >> ../../../petsc/src/ksp/pc/interface/precon.c >> [0]PETSC ERROR: #2 EPSSliceGetInertia() line 340 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c >> [0]PETSC ERROR: #3 EPSSetUp_KrylovSchur_Slice() line 467 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c >> [0]PETSC ERROR: #4 EPSSetUp_KrylovSchur() line 146 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/krylovschur.c >> [0]PETSC ERROR: #5 EPSSetUp() line 173 in >> ../../../slepc/src/eps/interface/epssetup.c >> Solution method: krylovschur >> [0]PETSC ERROR: #6 EPSSliceGetEPS() line 306 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c >> [0]PETSC ERROR: #7 EPSSetUp_KrylovSchur_Slice() line 416 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/ks-slice.c >> [0]PETSC ERROR: #8 EPSSetUp_KrylovSchur() line 146 in >> ../../../slepc/src/eps/impls/krylov/krylovschur/krylovschur.c >> [0]PETSC ERROR: #9 EPSSetUp() line 173 in >> ../../../slepc/src/eps/interface/epssetup.c >
