Manpages - PerlIO_mmap.3perl

PerlIO::mmap - Memory mapped IO

open my $fh, <:mmap, $filename;

This layer does read and write operations by *mmap()*ing the file if possible, but falls back to the default behavior if not.

PerlIO::mmap only exists to use XSLoader to load C code that provides support for using memory mapped IO. One does not need to explicitly use PerlIO::mmap;.