How does posix_memalign with alignment size of 4096 bytes differ from mmap? Does it internally use mmap or some other mechanism?
How does posix_memalign with alignment size of 4096 bytes differ from mmap ? Does
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How does posix_memalign with alignment size of 4096 bytes differ from mmap? Does it internally use mmap or some other mechanism?
posix_memalignis a higher-level API thanmmap, designed to interoperate withmalloc,freeandrealloc.mmapusage is more complicated because it offers more functionality thanposix_memalign(mapping files into a process’s address space). How it is implemented (in terms ofmmapor otherwise) is left unspecified by the POSIX standard.Use
posix_memalignwhere you’d usemallocif you didn’t have alignment restrictions.