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Re: [PATCH] x86: Add --enable-rdtscp-in-benchtests
On 23/10/18 4:28 PM, H.J. Lu wrote:
On 10/23/18, Siddhesh Poyarekar <firstname.lastname@example.org> wrote:
On 23/10/18 2:34 PM, Florian Weimer wrote:
Shouldn't the benchtests use clock_gettime anyway, to avoid issues in
case the TSC is not synchronized across cores?
There's an option USE_CLOCK_GETTIME to make benchtests do that, but
otherwise it uses the hp_timing bits by default.
I want something better that rdtsc and very low overhead since some bench
tests only last a few cycles. Adding lfence may make timing data look like
Is the configure option necessary? You could just add a Makefile option
in benchtests similar to USE_CLOCK_GETTIME and then document it in