Skip Montanaro wrote: ...
....If I mmap() a file, it's not slurped into main memory immediately, though as you pointed out, it's charged to my process's virtual memory. As I access bits of the file's contents, it will page in only what's necessary. If I mmap() a huge file, then print out a few bytes from the middle, only the page containing the interesting bytes is actually copied into physical memory.
my simple rather stupid experiment indicates that windows mmap at least will reserve 25Mb of paged file for a linear scan through a 25Mb file. I probably only need 4096b to scan. That's a lot less than even the page table requirement. This isn't rocket science just an old style observation.
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Robin Becker
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