I am using Marss cycle-accurate simulator, which uses QEMU. It is a full system simulator and gives both user and kernel stats.
However, even if I take only user-stats, the statistics vary a lot between different runs. I have asked this question on marss site, but could not get a good answer.
I was wondering if it has something to do with qemu. Or any qemu option/variation, that can make simulation deterministic. I tried using -icount auto and still some variation is there.
With simplescalar eio files, I have never observed any variation.
Can anyone explain why I get different stats for identical runs?