So, if I'm understanding this correctly, SIZE indicates how
much memory has been reserved for the application (and therefor
not available to other applications),
Nope. By default at least, Linux will overcommit memory. So, you
can run 40 different programs all with a 1GB size.
brk just basically means that if the program accesses below the
boundry, ok. If it accesses above the boundry (and there is
nothing else there, e.g., through mmap) then a segfault will
occur.
/me thinks mmap also counts towards SIZE.
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