Hi folks
I'm just playing around with vTaskGetRunTimeStats, and noticed the mp3 decoder is taking a fair chunk of the cpu usage.
I'm assuming the percentage stats are for both cores combined?
I'm running at 240mhz and I'm getting the following in a release build:
Task Name,Count,Percentage.
DisplayTask 49360006 24
IDLE0 28193852 13
IDLE1 51624214 25
Tmr Svc 108215 <1
esp_periph 673339 <1
tiT 222317 <1
eventTask 19 <1
ipc1 27443 <1
wifi 80810 <1
el-DspProcessor 3382366 1
el-DspInput 2564051 1
ipc0 23721 <1
el-i2s-out 4072345 2
el-i2s-in 4188545 2
el-mp3Decoder 54327737 26
el-PlayFatStream 2369882 1
main 989639 <1
esp_timer 100 <1
el-mp3Decoder 54327737 26% - I guess that's both cores - so mp3 decoder is taking up 50% of 1 core at 240mhz - sounds a little slow - previously I've work on a ARM7 core and mp3 took up around 40mhz - I know you can't compared cpu's and systems e.t.c..
Any ideas where my cpu power is going
Shabby
MP3 Decoder cpu usage
Re: MP3 Decoder cpu usage
Its not off both cores. You can further prove that by pinning it to either core 0 or core 1.
Also, Core 0 (IDLE0 13) is 100%-13% = 87% idle time.
Also, Core 1 (IDLE1 25) is 100%-25% = 75% idle time.
So you can see it's still pretty much spending most of its time twiddling its fingers waiting for something do to.
Also, Core 0 (IDLE0 13) is 100%-13% = 87% idle time.
Also, Core 1 (IDLE1 25) is 100%-25% = 75% idle time.
So you can see it's still pretty much spending most of its time twiddling its fingers waiting for something do to.
- shabtronic
- Posts: 49
- Joined: Sun Nov 03, 2019 1:33 pm
Re: MP3 Decoder cpu usage
sweeeet - I hope that's correct!! I thought 50% of 1 core for mp3 decode - even with float precision would be a little heavy
Thanks a lot for clearing that up!
Thanks a lot for clearing that up!
- shabtronic
- Posts: 49
- Joined: Sun Nov 03, 2019 1:33 pm
Re: MP3 Decoder cpu usage
I've now checked this again, and I think my initial interpretation was correct. I modified vTaskGetRunTimeStats to dump out float percentages and sorted the results in a stl vec list and then
dumped it out via printf. You can see both cores sum to 50%
I'm using ESP Timer as the stats menuconfig setting.
wonder what is going on here?
flac decoder is taking 13.4% overall - which would be 26.8% of core zero
and in this run
mp3 decode is taking 21.6x2 = 43.2% of core zero!
this looks like legit results because my DisplayTask I know is def taking up 90% of core one, because it's a crappy I2C SH1106 - and spends most of its time in the I2C data blit.
dumped it out via printf. You can see both cores sum to 50%
I'm using ESP Timer as the stats menuconfig setting.
wonder what is going on here?
Code: Select all
CoreID CPU % Name Counter
0 0.0 ipc0 23609
0 0.0 esp_timer 165
0 0.0 eventTask 18
0 0.1 Tmr Svc 213415
0 0.4 main 1044498
0 0.4 esp_periph 1148741
0 1.1 el-DspInput 3258728
0 1.7 el-DspProcessor 4853202
0 2.0 el-i2s-out 5938200
0 2.2 el-i2s-in 6306547
0 4.5 el-FatReader 13123428
0 13.4 el-flacDecoder 39281883
0 24.2 IDLE0 70659451
// core zero sums to roughly 50%
1 0.0 ipc1 27399
1 0.0 wifi 80848
1 2.0 IDLE1 5945890
1 47.9 DisplayTask 139905869
// core one sums roughly to 50%
and in this run
Code: Select all
CoreID CPU % Name Counter
0 0.0 ipc0 23621
0 0.0 esp_timer 17
0 0.0 eventTask 18
0 0.1 Tmr Svc 47718
0 0.4 esp_periph 328556
0 1.1 el-FatReader 893900
0 1.2 el-DspInput 937313
0 1.6 main 1257980
0 1.7 el-DspProcessor 1343979
0 2.1 el-i2s-out 1668628
0 2.3 el-i2s-in 1878145
0 16.0 IDLE0 12780879
0 21.6 el-mp3Decoder 17281307
1 0.0 ipc1 27402
1 0.1 wifi 80864
1 4.1 IDLE1 3289757
1 45.7 DisplayTask 36604502
this looks like legit results because my DisplayTask I know is def taking up 90% of core one, because it's a crappy I2C SH1106 - and spends most of its time in the I2C data blit.
- shabtronic
- Posts: 49
- Joined: Sun Nov 03, 2019 1:33 pm
Re: MP3 Decoder cpu usage
And the culprit was - allowing spi-ram/ps-ram to be used recklessly
Turning off spi-ram gets me much more realistic usage:
Since vTaskGetRunTimeStats does actually divide the % by the number of cores - I re modified that function to spit out core % rather than cpu %:
Seems it's best to tightly control spi-ram usage
Turning off spi-ram gets me much more realistic usage:
Since vTaskGetRunTimeStats does actually divide the % by the number of cores - I re modified that function to spit out core % rather than cpu %:
Code: Select all
CoreID Core % Name Counter
0 0.10 Tmr Svc 1002
0 0.52 esp_periph 5318
0 1.22 el-i2s-in 12408
0 1.28 el-FatReader 13047
0 1.32 el-DspInput 13427
0 1.70 el-i2s-out 17397
0 2.15 el-DspOutput 21951
0 25.13 el-mp3Decoder 256455
0 66.59 IDLE0 679564
1 2.33 IDLE1 23782
1 97.67 DisplayTask 996719
Re: MP3 Decoder cpu usage
can you give me the your used music ? and tell me the example you used.
- shabtronic
- Posts: 49
- Joined: Sun Nov 03, 2019 1:33 pm
Re: MP3 Decoder cpu usage
I'm afraid not - the mp3/flac player I wrote only plays random files from the sd-card every time. It's like a "discovery" shuffle system - I wrote it so I could never actually select a track - just Prev/Next from a random list sized 1024 tracks. I wrote it this way because I have some many audio files I've never listened to - and thought a fixed random shuffle player would force me to listen to the stuff I've never heard
I can tell you this tho:
1) 99.9% of my mp3 were 44.1khz
2) 99.9% of my flac files were 48khz 16bit.
Hope that helps!
I can tell you this tho:
1) 99.9% of my mp3 were 44.1khz
2) 99.9% of my flac files were 48khz 16bit.
Hope that helps!
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