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Message: [QUOTE="James Kanze, post: 2841288"] On all systems, it's CLOCKS_PER_SEC. Other than that, the only "standard" I know is Posix, which requires a value of 1000000 for CLOCKS_PER_SEC, i.e. microseconds. (Linux is also Posix conform in this respect.) Historically, the granularity was the number of ticks. This certainly isn't the case today, and I don't know of any system which really gives microsecond granularity. (Historically, on the first systems I used, CLOCKS_PER_SEC was 50 in Europe, and 60 in America. Which was the granularity.) [/QUOTE]