just because a processor isn't executing anything useful doesn't mean it isn't executing. The cores aren't shut down when idle, so you'd expect cycles to be the same on all processors (unless you've modified the OS and the system to be otherwise). As for instructions, generally these cpus are executing an idle loop. I'd expect that to be a supervisor instruction as well, but I don't know how solaris handles its idle loops. Personally, I prefer counting instructions by the context that executed them rather than just raw instructions, that way I can also account for how much time is spent in the OS, etc.
Phil
On Jun 9, 2010, at 1:50 PM, lopamudra chatterjee wrote:
> Hi,
>
> I am running 3 processes & binding them to some processors. The other processors are left idle. Therefore when I see the stats I should see less instruction & less cycles executed for the idle processors, right? But I see that both the idle & non idle processors nearly have the same values. The supervisor mode access percentage is also small so can't say that it is running OS processes.
> Does anyone has any idea why this is happening?
>
> Thanks & Regards,
> Lopamudra
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