CoreMark and Dhrystone benchmark numbers for the nRF52840

[nabil]

Hi,

I am trying to replicate the benchmark numbers stated by Nordic for the nRF52840 to verify I have setup the chip correctly for maximum performance. I have caching turned on and I followed the setup specified by ARM for running the benchmarks here.

Here are the official numbers by Nordic and ARM:

CoreMark
Nordic: 3.3
ARM: 3.42 

Dhrystone
Nordic: None in the datasheet
ARM: 1.25-1.95

My numbers are significantly smaller so I'm wondering if I missed something critical.

CoreMark

Keil MDK (--no_inline, -O3, optimized for time): 140/64mhz = 2.2

Dhrystone (Formula used is DMIPS/1757/MHz)

Keil MDK (--no_inline, -O3, optimized for time): 99823/1757/64 = 0.89

GCC (--no-inline, -O3, -funroll-loops -fomit-frame-pointer) 82052.71/1757/64 = 0.73

Is it possible to share the CoreMark project that was used to generate a score of 3.3? If not, is there anything other than turning on the cache that needs to be done?

Thanks

[Håkon Alseth]

Hi,

 

IAR is normally the toolchain that generates the most efficient output for coremark, when given no size or memory constraints. Please see this blog post for more info:

https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/comparing-compilersides-for-development-with-nrf5x

 

Could you try with the flags mentioned in the above post and see if they are comparable to yours?

 

Kind regards,

Håkon