Hi, who can tell me how big is the address space of a linux program?
2GB? 4GB? If, in my case, I have 512MB RAM, and 1.9GB swap space,
how big can my program be? If, at the same time, I use mmap instead of
malloc (which doesn't use swap space), then what's up-limit? What if I
have 1GB RAM? Besides, is there a way to get rid of the 2GB swap space