Hi all. The problem was that when running fds_mpi there was only one process on PC inspite of the parameter -np 8. The same project of mpi and FDS files on Windows gave 8 processes (amd 8-core PC). The program does not see the file /src/pm/hydra/utils/launch/launch.c and some other files ( running with the option -binding). The file exists, the folder is "shared". May be some environmental variables are needed? The file "Using the Hydra Process Manager" does not point to the variables for such directory. Please help. Thanks.