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Bonato__Tommaso

Beginner

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05-28-2020
02:42 PM

137 Views

Theoretical Scalar Integer Performance KabyLake

I was doing some experiments with Intel Advisor 2020 and in particular with the roofline model. Something I can't quite understand is why the peak scalar integer performance (intop/cycle) is different than the theoretical one that I would expect especially since all other metrics match more or less (vector integer performance, floating point..)

In particular according to Intel Advisor the max peak performance (for add/mul) is around 2.3 integer operations per cycle while the theoretical value I would expect to find is 4 intop/cycle since we have 4 INT ALU in 4 different ports.

Am I missing something?

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Roman_B_Intel

Employee

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06-02-2020
05:11 AM

137 Views

Thanks for noticing this problem! We will investigate the issue - there are no obvious extra hardware limits for scalar integer ops, so our benchmark may provide suboptimal value.

Regards, Roman

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