event for speculative executed instruction

event for speculative executed instruction

[Marina Moran]

Hi All,

We need to measure over two Intel computers the instruction executed
in a speculative manner, but not commited. We need to measure how many
instructions are discarded (over a period of time), to see how the
speculative execution is working. We check the manual with the
Performance Monitoring Events (from Intel) but cant figure out which
event to monitor. If you could please know where to look for it, or
with which name we shoudl look for it.

The intels are:
Intel Xeon CPU E5-2630 0 @ 2.30GHz
Intel Core2 Quad CPU    Q6600  @ 2.40GHz

Thanks so much in advance.
regards
Marina

Re: event for speculative executed instruction

[Andi Kleen]

Marina Moran <esperandoelmilagro@gmail.com> writes:
>
> The intels are:
> Intel Xeon CPU E5-2630 0 @ 2.30GHz
> Intel Core2 Quad CPU    Q6600  @ 2.40GHz

What you can measure on the E5 is cycles stalled due to recovery
from mis-speculation. That is not quite the same, but somewhat related.
The toplev tool in pmu-tools (http://github.com/andikleen/pmu-tools) can
do this on top of perf for the E5. No support for the Core2.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only