PerlIO::mmap - Memory mapped IO
#SYNOPSISopen 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;.
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