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Expurt is a kind of experts, who always asserts he/she knows everything.
The software expurt always prefer memory mapping file to a direct disk read:

A: Do you think we should read the file directly from disk?
B: You should never read a file directly from the disk. Instead mapping it to a memory mapping file. Operating system will take care of the reads and writes, and you pay little cost except for the first access.
by mkaysir April 07, 2015
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