This directory contains the MLD2P4 set of preconditioners. developed by Salvatore Filippone Pasqua D'Ambra Daniela di Serafino To compile: 0. Unpack the tar file in a directory of your choice; it can be inside the main PSBLAS directory, or somewhere else. 1. Edit Makefile and point PSBLASDIR to the main PSBLAS directory 2. Edit the Makefile in the main PSBLAS dir modifying the PREC variable to make it point to this directory, e.g. PREC=./mld2p4 3. Run make from the main PSBLAS directory.