Messages in this thread | | | Date | Thu, 10 Apr 2008 15:40:59 +0100 | From | "Jack Harvard" <> | Subject | gettimeofday() resolution in Linux? |
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Hi,
I would like to ask a few questions about how Linux keeps time.
As far as I understand, 1. Linux's time resolution is 10ms, as defined by HZ=100. 2. gettimeofday() can get time in microseconds, but I'm not sure about the accuracy of the time finer than 10ms. Sometimes gettimeofday( ) can even give me microseconds results rolled backwards in time, which I suspect could be caused by its accuracy. My question here is "how accurate is the time from gettimeofday()" 3. If I want to increase the time resolution to 1ms, I can possibly change HZ=1000, but if I want 1usec resolution, how can I do that? It would be too busy for the processor to handle so frequent timer interrupts if I just increase HZ=1000000.
Many thanks/muchas gracias/Danke vielmals!
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