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Alex Rivera
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I know this question may have been commonly asked before, but it seems most of those questions are regarding the elapsed time (based on wall clock) of a piece of code. The elapsed time of a piece of code is unlikely equal to the actual execution time, as other processes may be executing during the elapsed time of the code of interest. I used getrusage() to get the user time and system time of a process, and then calculate the actual execution time by (user time + system time). I am running my program on Ubuntu. Here are my questions: How do I know the precision of getrusage()? Are there other approaches that can provide higher precision than getrusage()?
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