Aztec Version 2.0 Release Notes * We have added several new features: 1) ilut preconditioner 2) ilu(k), bilu(k), icc(k) for k > 0. 2) arbitrary overlap in domain decomposition 3) equation reordering for incomplete factorization based on RCM algorithm 4) Matrix-free & user-supplied preconditioning interface 5) Improved flexability. Solvers can be used as preconditioners. ***************** IMPORTANT for Aztec 1.1 USERS **************** ***************** IMPORTANT for Aztec 1.1 USERS **************** ***************** IMPORTANT for Aztec 1.1 USERS **************** The following changes must be made to use Aztec 2.0: 1) references to "params[AZ_fill]" need to be changed to "params[AZ_ilut_fill]". 2) references such as "option[AZ_precond] = xxx;" where xxx is AZ_ilu, AZ_ilut, AZ_bilu must be changed to option[AZ_precond] = AZ_dom_decomp; options[AZ_subdomain_solve] = xxx; 3) options[AZ_keep_info] must be set to '1' if previous solver information is to be reused. Finally, Aztec 2.0 may give a somewhat different convergence history than Aztec 1.1. The main difference between the two is that RCM reordering is now the default when using incomplete factorizations. If you don't want this set options[AZ_reorder] = 0; ******************************************************************* ******************************************************************* ******************************************************************* * Several new machines have been added to the Makefile including: Cray T3E and Linux boxes. * A new matrix-free sample program has been included with the distribution. * We have fixed a bug in the MPI communication associated with AZ_transform(). * We have fixed a couple of memory bugs in the domain decomposition. * Other minor bug fixes. * IMPORTANT: a few Aztec function parameters have changed. Mostly things like using unsigned integers instead of signed integers. This may generate warnings on some compilers unless you explicitly cast the parameters. * The User's Guide has been updated to reflect these changes. -------------------------------------------------------------------------------