Ocean Modeling Discussion

I want to compile ROMS with -O3 optimization, while compiling one particular source file without O3. Does anyone know how to modify the build script or makefile to support this?

I'm trying to make sense of the time profiling output for an MPI run of ROMS, with example output below. Is the elapsed time for message passing included in the elapsed time for the non-linear model? For example, does the time elapsed shown for the Model 2D kernel also include the time for 2D halo ...