This commit enables some significant optimisations for esp32:
- move the VM to iRAM
- move hot parts of the runtime to iRAM (map lookup, load global/name,
mp_obj_get_type)
- enable MICROPY_OPT_LOAD_ATTR_FAST_PATH
- enable MICROPY_OPT_MAP_LOOKUP_CACHE
- disable assertions
- change from -Os to -O2 for compilation
It's hard to measure performance on esp32 due to external flash and
hardware caching. But this set of changes improves performance compared to
master by (on a TinyPICO with the GENERIC build, using IDF 4.2.2, running
at 160MHz):
diff of scores (higher is better)
N=100 M=100 esp32-master -> esp32-perf diff diff% (error%)
bm_chaos.py 71.28 -> 268.08 : +196.80 = +276.094% (+/-0.04%)
bm_fannkuch.py 44.10 -> 69.31 : +25.21 = +57.166% (+/-0.01%)
bm_fft.py 1385.27 -> 2538.23 : +1152.96 = +83.230% (+/-0.01%)
bm_float.py 1060.94 -> 3900.62 : +2839.68 = +267.657% (+/-0.03%)
bm_hexiom.py 10.90 -> 32.79 : +21.89 = +200.826% (+/-0.02%)
bm_nqueens.py 1000.83 -> 2372.87 : +1372.04 = +137.090% (+/-0.01%)
bm_pidigits.py 288.13 -> 664.40 : +376.27 = +130.590% (+/-0.46%)
misc_aes.py 102.45 -> 345.69 : +243.24 = +237.423% (+/-0.01%)
misc_mandel.py 1016.58 -> 2121.92 : +1105.34 = +108.731% (+/-0.01%)
misc_pystone.py 632.91 -> 1801.87 : +1168.96 = +184.696% (+/-0.08%)
misc_raytrace.py 76.66 -> 281.78 : +205.12 = +267.571% (+/-0.05%)
viper_call0.py 210.63 -> 273.17 : +62.54 = +29.692% (+/-0.01%)
viper_call1a.py 208.45 -> 269.51 : +61.06 = +29.292% (+/-0.00%)
viper_call1b.py 185.44 -> 228.25 : +42.81 = +23.086% (+/-0.01%)
viper_call1c.py 185.86 -> 228.90 : +43.04 = +23.157% (+/-0.01%)
viper_call2a.py 207.10 -> 267.25 : +60.15 = +29.044% (+/-0.00%)
viper_call2b.py 173.76 -> 209.42 : +35.66 = +20.523% (+/-0.00%)
Five tests have more than 3x speed up (200%+).
The performance of the tests bm_fft, bm_pidigits and misc_aes now scale
with CPU frequency (eg changing frequency to 240MHz boosts the performance
of these by 50%), which means they are no longer influenced by timing of
external flash access. (The viper_call* tests did previously scale with
CPU frequency, and they still do.)
Turning off assertions reduces code size by about 80k, and going from -Os
to -O2 costs about 100k, so the net change in code size (for the GENERIC
board) is about +20k.
If a board wants to enable assertions, or use -Os instead of -O2, that's
still possible by overriding the sdkconfig parameters.
Signed-off-by: Damien George <damien@micropython.org>
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