Scott: > We have been using Yousef Saad's PGMRES with the ILUT pre-conditioner with > drop tolerance of 0.01 and lfil of 100. > > What specific settings/calls are needed in PETSc to achieve the equivalent > of this previous solution scheme?
Your can use superlu's ILUT through PETSc, for example, src/ksp/ksp/examples/tutorials>./ex2 -pc_type ilu -pc_factor_mat_solver_package superlu -mat_superlu_ilu_droptol 0.01 Norm of error 0.000544426 iterations 2 Running an example with '-help |grep superlu' lists all available options -mat_superlu_ilu_droptol <0.0001>: ILU_DropTol (None) -mat_superlu_ilu_filltol <0.01>: ILU_FillTol (None) -mat_superlu_ilu_fillfactor <10>: ILU_FillFactor (None) -mat_superlu_ilu_droprull <9>: ILU_DropRule (None) -mat_superlu_ilu_norm <2>: ILU_Norm (None) -mat_superlu_ilu_milu <0>: ILU_MILU (None) Note: you must configure petsc with superlu. See http://www.mcs.anl.gov/petsc/petsc-as/miscellaneous/external.html Hong > > Scott Ormiston >
