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* Speed up sum by using reasonable read buffer sizes. Use a 4K read buffer for each of the checksum functions, which seems reasonable. This improves the performance of BSD checksums on odyssey1024.txt from 399ms to 325ms on my laptop, and of SysV checksums from 242ms to 67ms. * Add BENCHMARKING.md for `sum`. * Add comment regarding block sizes. * Improve portability of BENCHMARKING.md * Make `div_ceil` const and enhance comment. |
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