[LLVMdev] Use perf tool for more accurate time measuring on Linux

[Yi Kong]

I've been running Hal Finkel's benchmarking mode patch along with perf
tool patch, and posted the results on http://146.169.44.158:55080/.

For the results I've collected until now, by defaulting to use median
instead of minimum, there isn't any same-run comparison false positive
result.

Cheers,
Yi Kong

On 22 May 2014 11:34, Yi Kong <kongy.dev at gmail.com> wrote:
> Updated.
>
> On 22 May 2014 07:54, Chandler Carruth <chandlerc at google.com> wrote:
>> I should have mentioned this idea previously, but what about making the
>> script gracefully degrade in the absence of these tools? That way builders
>> won't regress but ones with the tools will just get better timing.