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README

@@ -18,11 +18,28 @@ To compile:
 4. Go into the test subdirectory and build the examples of your choice.
 
 Notes:
-The single precision version is  supported only by SuperLU; thus, even
-if you specify at configure to use UMFPACK or SuperLU_Dist, the
-corresponding preconditioner options will be available only from the
-double precision version.
-
 
+- The single precision version is  supported only by SuperLU; thus, even
+  if you specify at configure to use UMFPACK or SuperLU_Dist, the
+  corresponding preconditioner options will be available only from the
+  double precision version.
+
+- The Krylov methods are linked and recompiled from the PSBLAS source
+  directory;  thus we define here two libraries, libmld_krylov.a and
+  libmld_prec.a, and a bunch of modules, including a duplicate of
+  psb_krylov_mod.mod. The directories for the MLD2P4 versions, in both
+  the include and link paths, must come before the PSBLAS ones,
+  because the Krylov interface is superseded by the new one. 
+  Once the CLASS() construct becomes available in Gnu Fortran, this
+  will no longer be necessary, and the duplicate Krylov library and
+  module will go away, leaving only the mld_prec library and module. 
+
+- A program that was using the PSBLAS precoditioners needs no source
+  code changes, but should be recompiled. If the new preconditioner
+  (or preconditioner options, such as ILU(N) factorization) are
+  required, only the type of the preconditioner object and its
+  setup/build/free calls should be updated; the rest of the
+  application continues to make use of the PSBLAS existing
+  interfaces.