I’m trying to measure getrusage resolution via simple program: And when I run it, I usually get output similar to the following: ema@scv:~/tmp/getrusage$ ./gt u:0.000562 uz:0.000563 cnt:1 ema@scv:~/tmp/getrusage$ ./gt u:0.000553 uz:0.000554 cnt:1 ema@scv:~/tmp/getrusage$ ./gt u:0.000496 uz:0.000497 cnt:1 ema@scv:~/tmp/getrusage$ ./gt u:0.000475 uz:0.000476 cnt:1 Which seems to hint that the resolution of getrusage is around 1 microsecond. I thought it should be