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    Why don't you make a small test and see? Anyways, there're a lot of variables like portability, distribution, actual problem to solve and so on. Commented Nov 29, 2015 at 15:37
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    What kind of data? What size? What computer? Commented Nov 29, 2015 at 15:46
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    This is basically covered in stackoverflow.com/questions/5588605/mmap-vs-read although iostreams introduce additional overhead to read. Commented Nov 29, 2015 at 15:58