exegesis | Tools for implementing server-side OpenAPI 300 | REST library
kandi X-RAY | exegesis Summary
kandi X-RAY | exegesis Summary
Exegesis is a library for implementing server-side OpenAPI 3.x The library has been written in such a way that hopefully it will also be used to implement future versions of OpenAPI, or possibly even other API description standards altogether.
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QUESTION
I wanted to benchmark the time needed to do a single addition on my Skylake (i5-6500) CPU. C is low-level enough for me, so I wrote the following code:
...ANSWER
Answered 2020-Jan-18 at 03:49The core frequency and the TSC frequency can be different. Your loop is expected to run at 1 core cycles per iteration. If the core frequency happens to be twice as the TSC frequency for the duration of the loop execution, the throughput would be 0.5 TSC cycles per iteration, which is equivalent to 1 core cycles per iteration.
In your case, it appears that the average core frequency was slightly higher than the TSC frequency. If you don't want to take dynamic frequency scaling into account when doing experiments, it'd be easier to just fix the core frequency to be equal to the TSC frequency so that you don't have to convert the numbers. Otherwise, you'd have to measure the average the core frequency as well.
On processors that support per-core frequency scaling, you have to either fix the frequency on all the cores or pin the experiments to a single core with fixed frequency. Alternatively, instead of measuring in TSC cycles, you can use a tool like perf
to easily measure the time in core cycles or seconds.
See also: How to get the CPU cycle count in x86_64 from C++?.
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