On Sat, Sep 29, 2012 at 10:35 AM, Ankita (Garg) Goel
<[email protected]>wrote:
> Hi,
>
> I was interesting in collecting per-cycle statistics. While doing, I found
> that the total number of instructions being dispatched suddenly got reset
> to zero:
>
> W64 total_insns = 0;
> for (W32 i = 0; i < OPCLASS_COUNT; i++) {
> total_insns += CORE_STATS(dispatch.opclass)[i];
> }
>
> So total_insns would typically increase from 0 to a 1000+ value and then
> somehow in some random cycle in between, it seems to be getting a value of
> zero. Am I gathering the above data incorrectly ? I did look at the source
> for the core_stats, but could not find a place where the stats are being
> reset. Any thoughts ?
>
> If these values starts from 0 only once it must be change of phase from
user level to kernel or vise versa. Because we store separate stats for
user level and kernel level, when core switches to other level, it uses
separate counter storage.
what is your aim to collect the total_insns count. If you are looking into
periodic counter value then checkout time-stats options which dump specific
stats counter's value after fix interval in to csv file.
- Avadh
> Appreciate your help!
>
> --
> Regards,
> Ankita
> Graduate Student
> Department of Computer Science
> University of Texas at Austin
>
>
>
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