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how does one get microsecond resolution from the gettimeofday(2) system call?

April 26, 2017microsecond resolution system

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how does one get microsecond resolution from the gettimeofday(2) system call?

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Normally, Digital UNIX updates its internal idea of the current time once per clock tick (1024 Hz, or about once per millisecond). In Digital UNIX V4.0 and later, it is possible to rebuild the kernel to support approximately microsecond resolution from the gettimeofday(2) system call, and from the various library routines that use this system call.