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Hi,
We found the following document on Cortex-A9 performance.
List of ARM microarchitectures - Wikipedia, the free encyclopedia
Which claims 2.5 DMIPS/MHz per core for Cortex-A9 2GHz@2 core. However, our Dhrystone result on Cortex-A9 1.2GHz@2 core only showed roughly 1 DMIPS/MHz per core.
We downloaded the Dhrystone benchmark from the following link and cross-compiled it with gcc version 4.5.2.
dhrystone 2.1 - Download, Browsing & More | Fossies Archive
We realize that Dhrystone measurements will vary due to differences in compilers and OS. And I would like to know whether our result is reasonable or not?
Best,
Ying
I know only one core would be running the test.
Take -O3 as an example.
I got 2898550.8 Dhrystones per Second, and I divided by 1757 to get 1649 DMIPS/core. And then I divided by 1200 to get 1.37 DMIPS/MHz/core.
I thought whole DMIPS with 2 cores would be 1649*2=3298 DMIPS.
Is this calculation correct?
Yes the calculation giving 1.37 DMIPS/MHz/core is correct.
I had a search for problems like this and I found that Phoronix had got similar figures with a Pandaboard a couple of years ago. I can't see any resolution of the problem there though.
ARM Cortex-A9 PandaBoard ES Benchmarks - Page 4
Hello daith
i am also calculating DMIPS for my system with 4 cores. on linux OS.
i am getting 1.67 DMIPS/MHz.
so should i divide it by 4 to make it per Core.