Allocating more memory than there exists using malloc

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It is called memory overcommit. You can disable it by running as root:

 echo 2 > /proc/sys/vm/overcommit_memory

and it is not a kernel feature that I like (so I always disable it). See malloc(3) and mmap(2) and proc(5)

NB: echo 0 instead of echo 2 often -but not always- works also. Read the docs (in particular proc man page that I just linked to).

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