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On 23/10/18 4:28 PM, H.J. Lu wrote:
On 10/23/18, Siddhesh Poyarekar <siddhesh@gotplt.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 noise.
Is the configure option necessary? You could just add a Makefile option in benchtests similar to USE_CLOCK_GETTIME and then document it in benchtests/README.
Siddhesh
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