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Why is there sometimes a significant difference between elapsed time and CPU time for the calculation?

April 26, 2017calculation CPU difference elapsed SIGNIFICANT time

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Why is there sometimes a significant difference between elapsed time and CPU time for the calculation?

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It runs on a machine that’s serving many people’s web sites simultaneously. To not be greedy, the factorization program runs at a low priority. Also, bear in mind that in the worst case, the program reads over 150 million bytes from a disk file.