Kotlin: Experimental. Benchmark for coroutines (decoding with parallel tasks)

[ignaciotcrespo]

Using coroutines to generate parts of the image in parallel shows a good performance but only for images >= 48x24, specially with 3 tasks.

Here the benchmark in my Galaxy A5. The performance increases 50% with 3 parallel tasks.

The result for 1 task is not using any coroutine.

To compare a benchmark result code without coroutines, you can use the branch https://github.com/ignaciotcrespo/blurhash/tree/benchmark-array-cacheEnabled

Galaxy A5, current version array + cache

-----------------------------------
Device: samsung - SM-A500FU
OS: Android REL - API 23
-----------------------------------
Array: true, cache: true
-----------------------------------
width: 20, height: 12
-> 10 bitmaps
<- 30 ms, Avg: 3.0 ms
-> 100 bitmaps
<- 186 ms, Avg: 1.86 ms


width: 40, height: 24
-> 10 bitmaps
<- 83 ms, Avg: 8.3 ms
-> 100 bitmaps
<- 731 ms, Avg: 7.31 ms


width: 80, height: 48
-> 10 bitmaps
<- 335 ms, Avg: 33.5 ms
-> 100 bitmaps
<- 2924 ms, Avg: 29.24 ms

Galaxy A5, using coroutines

-----------------------------------
Device: samsung - SM-A500FU
OS: Android REL - API 23
-----------------------------------

-----------------------------------
Parallel tasks: 1
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 5.00 ms, Avg: 5.00 ms, Max: 5.00, Min: 5.00
-> 10 bitmaps
<- 25.06 ms, Avg: 2.51 ms, Max: 7.14, Min: 1.81
-> 100 bitmaps
<- 196.96 ms, Avg: 1.97 ms, Max: 5.24, Min: 1.77


width: 40, height: 24
-> 1 bitmaps
<- 20.28 ms, Avg: 20.28 ms, Max: 20.28, Min: 20.28
-> 10 bitmaps
<- 85.42 ms, Avg: 8.54 ms, Max: 20.03, Min: 6.97
-> 100 bitmaps
<- 737.50 ms, Avg: 7.37 ms, Max: 20.15, Min: 6.86


width: 80, height: 48
-> 1 bitmaps
<- 79.84 ms, Avg: 79.84 ms, Max: 79.84, Min: 79.84
-> 10 bitmaps
<- 337.62 ms, Avg: 33.76 ms, Max: 81.32, Min: 28.03
-> 100 bitmaps
<- 2921.94 ms, Avg: 29.22 ms, Max: 79.32, Min: 28.01



-----------------------------------
Parallel tasks: 2
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 3.94 ms, Avg: 3.94 ms, Max: 3.94, Min: 3.94
-> 10 bitmaps
<- 26.48 ms, Avg: 2.65 ms, Max: 4.30, Min: 2.05
-> 100 bitmaps
<- 222.35 ms, Avg: 2.22 ms, Max: 5.54, Min: 1.62


width: 40, height: 24
-> 1 bitmaps
<- 12.43 ms, Avg: 12.43 ms, Max: 12.43, Min: 12.43
-> 10 bitmaps
<- 63.46 ms, Avg: 6.35 ms, Max: 15.74, Min: 4.81
-> 100 bitmaps
<- 566.36 ms, Avg: 5.66 ms, Max: 12.67, Min: 4.30


width: 80, height: 48
-> 1 bitmaps
<- 43.52 ms, Avg: 43.52 ms, Max: 43.52, Min: 43.52
-> 10 bitmaps
<- 192.24 ms, Avg: 19.22 ms, Max: 40.43, Min: 15.52
-> 100 bitmaps
<- 1725.76 ms, Avg: 17.26 ms, Max: 42.17, Min: 15.24



-----------------------------------
Parallel tasks: 3
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 5.10 ms, Avg: 5.10 ms, Max: 5.10, Min: 5.10
-> 10 bitmaps
<- 32.44 ms, Avg: 3.24 ms, Max: 6.40, Min: 1.94
-> 100 bitmaps
<- 241.19 ms, Avg: 2.41 ms, Max: 6.21, Min: 1.72


width: 40, height: 24
-> 1 bitmaps
<- 7.58 ms, Avg: 7.58 ms, Max: 7.58, Min: 7.58
-> 10 bitmaps
<- 47.92 ms, Avg: 4.79 ms, Max: 9.27, Min: 3.54
-> 100 bitmaps
<- 425.90 ms, Avg: 4.26 ms, Max: 7.73, Min: 3.14


width: 80, height: 48
-> 1 bitmaps
<- 38.00 ms, Avg: 38.00 ms, Max: 38.00, Min: 38.00
-> 10 bitmaps
<- 148.51 ms, Avg: 14.85 ms, Max: 36.44, Min: 11.12
-> 100 bitmaps
<- 1327.79 ms, Avg: 13.28 ms, Max: 30.85, Min: 10.78

[ignaciotcrespo]

@hangduykhiem @connyduck here the PR to play with coroutines

[ignaciotcrespo]

Benchmark in Pixel 4, improvement ~40%, again only for big images

Pixel 4, array + cache

-----------------------------------
Device: Google - Pixel 4
OS: Android REL - API 29
-----------------------------------
Array: true, cache: true
-----------------------------------
width: 20, height: 12
-> 10 bitmaps
<- 2 ms, Avg: 0.2 ms
-> 100 bitmaps
<- 13 ms, Avg: 0.13 ms


width: 40, height: 24
-> 10 bitmaps
<- 3 ms, Avg: 0.3 ms
-> 100 bitmaps
<- 29 ms, Avg: 0.29 ms


width: 80, height: 48
-> 10 bitmaps
<- 12 ms, Avg: 1.2 ms
-> 100 bitmaps
<- 107 ms, Avg: 1.07 ms

Pixel 4, coroutines

-----------------------------------
Device: Google - Pixel 4
OS: Android REL - API 29
-----------------------------------

-----------------------------------
Parallel tasks: 1
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 0,28 ms, Avg: 0,28 ms, Max: 0,28, Min: 0,28
-> 10 bitmaps
<- 1,29 ms, Avg: 0,13 ms, Max: 0,25, Min: 0,08
-> 100 bitmaps
<- 9,54 ms, Avg: 0,10 ms, Max: 0,26, Min: 0,08


width: 40, height: 24
-> 1 bitmaps
<- 0,78 ms, Avg: 0,78 ms, Max: 0,78, Min: 0,78
-> 10 bitmaps
<- 3,66 ms, Avg: 0,37 ms, Max: 0,72, Min: 0,31
-> 100 bitmaps
<- 32,03 ms, Avg: 0,32 ms, Max: 0,70, Min: 0,31


width: 80, height: 48
-> 1 bitmaps
<- 2,65 ms, Avg: 2,65 ms, Max: 2,65, Min: 2,65
-> 10 bitmaps
<- 13,89 ms, Avg: 1,39 ms, Max: 2,68, Min: 1,22
-> 100 bitmaps
<- 111,27 ms, Avg: 1,11 ms, Max: 2,66, Min: 1,02



-----------------------------------
Parallel tasks: 2
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 0,65 ms, Avg: 0,65 ms, Max: 0,65, Min: 0,65
-> 10 bitmaps
<- 2,00 ms, Avg: 0,20 ms, Max: 0,33, Min: 0,15
-> 100 bitmaps
<- 17,42 ms, Avg: 0,17 ms, Max: 1,88, Min: 0,11


width: 40, height: 24
-> 1 bitmaps
<- 0,62 ms, Avg: 0,62 ms, Max: 0,62, Min: 0,62
-> 10 bitmaps
<- 2,92 ms, Avg: 0,29 ms, Max: 0,61, Min: 0,24
-> 100 bitmaps
<- 32,25 ms, Avg: 0,32 ms, Max: 1,07, Min: 0,23


width: 80, height: 48
-> 1 bitmaps
<- 3,36 ms, Avg: 3,36 ms, Max: 3,36, Min: 3,36
-> 10 bitmaps
<- 10,33 ms, Avg: 1,03 ms, Max: 3,85, Min: 0,69
-> 100 bitmaps
<- 78,82 ms, Avg: 0,79 ms, Max: 1,84, Min: 0,68



-----------------------------------
Parallel tasks: 3
-----------------------------------
width: 20, height: 12
-> 1 bitmaps
<- 0,30 ms, Avg: 0,30 ms, Max: 0,30, Min: 0,30
-> 10 bitmaps
<- 5,04 ms, Avg: 0,50 ms, Max: 3,20, Min: 0,12
-> 100 bitmaps
<- 21,17 ms, Avg: 0,21 ms, Max: 2,86, Min: 0,11


width: 40, height: 24
-> 1 bitmaps
<- 0,84 ms, Avg: 0,84 ms, Max: 0,84, Min: 0,84
-> 10 bitmaps
<- 3,45 ms, Avg: 0,34 ms, Max: 0,71, Min: 0,24
-> 100 bitmaps
<- 28,81 ms, Avg: 0,29 ms, Max: 0,99, Min: 0,19


width: 80, height: 48
-> 1 bitmaps
<- 1,13 ms, Avg: 1,13 ms, Max: 1,13, Min: 1,13
-> 10 bitmaps
<- 8,11 ms, Avg: 0,81 ms, Max: 1,62, Min: 0,50
-> 100 bitmaps
<- 61,50 ms, Avg: 0,61 ms, Max: 2,54, Min: 0,49