This is required information for some MPI using app that I am working with...
From its Makefile template:
#insert memory per core and uncomment the following line #PREPROC= -D'MB_PER_CORE=750'
Note that said scientific app runs also on NUMA machines, like Cray, where each core has its own memory. I am asking here what to put in above line on Linux on e.g. 12GB machine with 16 cores.