On Fri, 12 Feb 2010, heechul Yun wrote:
> I'm experimenting performance counter to find deterministic events.
>
> I originally thought that the number of retired instructions will be the
> same for every run of the program with the same input. However, it was not.
>
> ///
>
> What is the reason of this unexpected non-determinism?
You can find an entire paper about the non-determinism of the retired
instruction performance counter here:
http://www.csl.cornell.edu/~vince/papers/iiswc08/
There's a lot of reasons for this, though the one that causes the most
trouble is address space randomization, which can be turned off under
Linux.
Vince
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