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change the number of processors in CESM2.1.2

I made changes in "env_mach_pes.xml" about the nodes I needed for my CESM2 run, and then ran the command:

./case.setup --reset

I found that all my changes made on "env_mach_pes.xml" return to its default value. So what is the right step here to make changes for the nodes/processors for CESM2?