* Neil Horman <[email protected]> wrote:
> Prefetch and simluated adcx/adox from above:
> Performance counter stats for './test.sh' (20 runs):
>
> 35,704,331 L1-dcache-load-misses
> ( +- 0.07% ) [75.00%]
> 0 L1-dcache-prefetches
> [75.00%]
> 19,751,409,264 cycles # 0.000 GHz
> ( +- 0.59% ) [75.00%]
> 34,850,056 branch-misses
> ( +- 1.29% ) [75.00%]
>
> 7.768602160 seconds time elapsed
> ( +- 1.38% )
btw., you might also want to try measuring only the basics:
-e cycles -e instructions -e branches -e branch-misses
that should give you 100% in the last column and should also allow
you to double check whether all the PMU counts are correct: is it
the expected number of instructions, expected number of branches,
expected number of branch-misses, etc.
Then you can remove branch stats and add just L1-dcache stats - and
still be 100% covered:
-e cycles -e instructions -e L1-dcache-loads -e L1-dcache-load-misses
etc.
Just so that you can trust what the PMU tells you. Prefetch counts
are sometimes off, they might include speculative activities, etc.
Thanks,
Ingo
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