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Can the input file be read from the file systems buffer cache in main memory?

April 26, 2017buffer cache file input main memory read system

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Can the input file be read from the file systems buffer cache in main memory?

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We want the entire input file to be read from disk. If you are not using direct (unbuffered) IO, before you run the sort program you must first insure that the input file is not in the file system buffer cache (e.g. by reading a large, unrelated file as large as your system’s main memory).