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sidewaysintpr(). This increases the accuracy of the per-interval counts when they are interpreted as rates. Repeated calls to alarm(n) give an average interval that is about 2 ticks larger than n and has a large variance. Periodic itimers normally get the average almost right but have similarly large variance (due to scheduling delays). Statistics utilities should use clock_gettime() to determine the actual interval, but it is still useful to maximize the accuracy of the interval, especially for cases like netstat -w where counts are displayed so the program cannot hide the inaccuracy in a rate conversion.
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