How to test performance?

[xtuzy]

I always worry SharpConstraintLayout can't be used in real word, because i don't know the performance, test in core is fast, but in ui, it need calculate more things, i don't know how to test it. I only know, when i resize Windows app, flow test like slow.

Goolgle use androidx.constraintlayout , i believe it meet needs. I try to add a framerate label and a androidx.constraintlayout
flow test to compare with sharpconstraintlayout at a5ec59b, get result:

sharex-20230303104301.mp4

We can see when resize window of app that run in Windows subsystem for Android, androidx.constraintlayout and sharpconstraintlayout all get low framerate. But when change child, framerate is ok.

[xtuzy]

Maui framerate < 60 when there are 200 controls:

sharex-20230304111633.mp4

[xtuzy]

SharpConstraintLayout.Native is ok when there are 200 controls:

sharex-20230304120657.mp4

[xtuzy]

when use net6, i see log show measure many times, tonight i try use net7, measure little times, tomorrow i will test it.
another i find i can directly load measure method to calculate time of measure, maybe i can use it to compare other layout

[xtuzy]

200个控件在flow里慢的原因主要是重复布局了, 可能导致重复布局的因素是文本输入控件的重复布局

1. 我因为Entry在iOS上输入时显示省略号, 在TextChange里刷新了View, log中更改文本时显示两次布局过程
2. Editor控件输入时导致多次布局, 暂且不知道为什么

[xtuzy]

v2.2.0

• remove entry in flow performance test, when entry/editor is wrapcontent, will generate many bug. when we use entry or editor, usually will constrain it.
• i also obsolete baseline api, not calculate it will save time

[xtuzy]

I see log always have some bug about measure order, breakpoint sometimes not work, I feel best way test it is use a complex collectionview, see fps when fast scroll.

[xtuzy]

When i use ConstraintLayout in https://github.com/xtuzy/MauiUICollectionView, I know a way to test performance, use IView.Measure can get time fo measure.

Now test code see 49a27fe , it use a CollectonView, use Official Layout and ConstraintLayout to layout item, record time of measure.
Result: Official Layout faster than SharpConstraintLayout

I run it on android old phone, it scroll well:
https://twitter.com/H_N_B_D_D/status/1676483931967979520?t=8Qk2XL0iefq5Ka31NvL1Ng&s=19

One bug is it is slow on start, use official layout also.