CoreMark
The initial code was developed in 2009 by EEMBC. Since 2018 it is additionally licenced with the Apache licence.
In 2019 Paul Stoffregen from PJRC with the Teensy project ported it to Arduino. It runs out of the box on an ESP32. Multicore optimisation is not enabled yet. In ubuntu it works with
make XCFLAGS="-g -DMULTITHREAD=4 -DUSE_FORK=1"
Some of my results from Arduino IDE and Ubuntu:
| Board | CoreMark | LED | MHz | Mark/MHz |
|---|---|---|---|---|
| Arduino MEGA 2560 | 7 | 13 | 16 | 0.44 |
| STM32F103C8T6 128k | 81 | 17 | 72 | 1.13 |
| STM32F401CCU6 256k | 150 | 31 | 84 | 1.79 |
| STM32F411CEU6 512k | 172 | 31 | 100 | 1.72 |
| T-Koala ESP32 | 351 | 5 | 160 | 2.19 |
| Raspberry Pi Model B v2 | 1574 | 700 | 2.25 | |
| Raspberry Pi 3 Model B | 3800 | 1200 | 3.17 | |
| Amlogic S905W tanix tx3 | 3913 | 1200 | 3.26 | |
| Raspberry Pi 4 v1.1 4GB | 8257 | 1500 | 5.50 | |
| Xeon X5550 | 13643 | 3060 | 4.46 | |
| i5-3320M | 21245 | 3300 | 6.44 | |
| i7-4960HQ | 21326 | 3800 | 5.61 | |
| i7-6820HQ | 23779 | 3660 | 6.61 | |
| i3-10100 | 30532 | 4220 | 7.23 |
Multithread results
| Board | CoreMark | MHz | Mark/Mhz |
|---|---|---|---|
| RPi3 Model B 4 threads | 15194 | 1200 | 3.16 |
| Amlogic S905W 4 threads | 15393 | 1200 | 3.21 |
| Raspberry 4 with 4 threads | 32880 | 1500 | 5.48 |
| i5-3320M 4 threads | 53450 | 3300 | 4.05 |
| i7-4960HQ 4 threads | 74944 | 3800 | 4.93 |
| i7-4960HQ 8 threads | 95261 | 3800 | 3.13 |
| i7-6820HQ 4 threads | 96420 | 3660 | 6.70 |
| i3-10100 4 threads | 103808 | 4070 | 6.38 |
| i7-6820HQ 8 threads | 118862 | 3660 | 4.13 |
| Xeon X5550 16 threads | 124634 | 3060 | 2.55 |
| i3-10100 8 threads | 167829 | 4070 | 4.95 |
Bluepill STM32F103C8T6 only with ST-Link V2 programmer.
Blackpill STM32F401CCU6 and STM32F411CEU6 working with:
- Correct board and board part number
- U(S)ART support: “Enabled (generic ‘Serial’)”
- USB support (if available): “CDC (generic ‘Serial’ supersede U(S)ART)” to have COM port serial after reboot
- Upload method: “STM32CubeProgrammer (DFU)”
Programming mode activated by press and hold Boot0 and hit NRST. You have a new USB devices “STM32 BOOTLOADER”.
Most interesting is the ratio CoreMark/MHz:
ESP IDF crosscompiling toolchain
The Arduino port from Paul Stoffregen does not run on ESP8266 yet. But ochrin used the esp8266 toolchain and got some results in March 2020. I tried to replicate his results:
| Board | CoreMark | Ochrin |
|---|---|---|
| ESP8266 80 MHz | 155 | 191 |
| ESP8266 160 MHz | 262 | |
| ESP32 80 MHz | 166 | |
| ESP32 160 MHz | 332 | |
| ESP32 240 MHz | 498 | |
| ESP32 2C 160 MHz | 661 | |
| ESP32 2C 240 MHz | 991 |
Still no match for the 2314 coremark score of the Teensy 4.0 (Cortex-M7 at 600 MHz compared to LX6 with 240 MHz). I can’t make the ESP32 toolchain running.