On Fri 2008-03-21 19:31, Lisandro Dalcin wrote:

Mmm... I believe this is a configuration issue... if ML_MPI were defined, then ML_USR_COMM should be MPI_Comm. But the problem is perhaps on the ML side, not the PETSc side.

"ml_common.h" #define ML_MPI if macro HAVE_MPI is defined. In turn HAVE_MPI is at "ml_config.h", and that file is surelly generated by ML configure script. For some reason ML's configure failed to found MPI with the command line stuff PETSc pass to it. Look at the 'config.log' file inside the "ml-5.0" dir to find what happened.

From the ML docs, it looks like ML's configure expects --with-mpi-compilers if it is building with MPI. I modified config/PETSc/packages/ml.py to include this option and I'll let you know if it fixes the problem. Jed