[essentials] use Lazy<T> for Android application-wide values by jonathanpeppers · Pull Request #7996 · dotnet/maui

jonathanpeppers · 2022-06-13T15:48:15Z

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui

I was reviewing a benchmark/sample that puts lots of labels on the
screen that say "dope" and measures how many per second. Personally, I
would have chosen some other word like LOL, so you could have a
LOLs/s average. LOL?

Reviewing dotnet trace output, I saw:

1.06s (6.3%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedLayoutDirection()
4.46ms (0.03%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedTheme()

So approximately 6.3% of the time was spent querying if layouts are
RTL or not? And 0.03% checking dark mode?

I went through AppInfoImplementation on Android, and simply used
Lazy<T> for every value that queries Application.Context. These
values cannot change after the app launches, so they don't need to be
computed on every call.

If these values ever need to match a Context for multiple
activities, we should re-evaluate this caching. A dictionary using a
key of Context.Handle might work for that case.

We can also remove places with #if __ANDROID_24__ as they are always
true in .NET 6. Runtime checks using OperatingSystem should be used
going forward.

Results

A Release build on a Pixel 5 device, I was getting:

Before: 55.42 Dopes/s
After:  64.23 Dopes/s

This should help the performance of Label in any .NET MAUI
application running on Android.

Context: dotnet#7996 Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon my changes in dotnet#7996 (sample sample), I noticed: 7.60s (14%) mono.android!Android.Views.View.get_Context() 14% of the time is literally spent calling `View.Context`! We did a little investigation on the underlying Java interop, this is basically doing: 1. Call into JNI, get an `IntPtr`. 2. See if that `IntPtr` maps to a C# object that is already alive. 3. Return the C# object, or create a new one if needed. We can actually avoid all this work, in this case. For example: 5.48s (10%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorX(Android.Views.View,Microsoft.Maui.IView) 4.28s (8.2%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorY(Android.Views.View,Microsoft.Maui.IView) These extension methods call `View.Context` twice: public static void UpdateTranslationY(this AView platformView, IView view) { if (platformView.Context == null) return; platformView.TranslationY = platformView.Context.ToPixels(view.TranslationY); } We can actually, make an overload for `ToPixels()` to where `View.Context` wouldn't be called *at all*: internal static float ToPixels (this View view, double dp) { if (s_displayDensity != float.MinValue) return (float)Math.Ceiling(dp * s_displayDensity); return view.Context.ToPixels(dp); } I used this everywhere I saw it appearing in `dotnet trace` output. Next, I saw `View.Context` being called a lot from `LayoutViewGroup` and `ContentViewGroup`. I could simply store the value in the constructor for these types, make it non-nullable, and remove null checks. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 64.23 Dopes/s After: 81.70 Dopes/s

src/Essentials/src/AppInfo/AppInfo.android.cs

mattleibow · 2022-06-14T18:05:21Z

Can we retarget to net6.0 and these changes will flow up to main and net7

mattleibow

Retarget

jonathanpeppers · 2022-06-14T19:58:14Z

@mattleibow I think I want this in .NET 7-only.

Context: dotnet#7996 Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon my changes in dotnet#7996 (sample sample), I noticed: 7.60s (14%) mono.android!Android.Views.View.get_Context() 14% of the time is literally spent calling `View.Context`! We did a little investigation on the underlying Java interop, this is basically doing: 1. Call into JNI, get an `IntPtr`. 2. See if that `IntPtr` maps to a C# object that is already alive. 3. Return the C# object, or create a new one if needed. We can actually avoid all this work, in this case. For example: 5.48s (10%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorX(Android.Views.View,Microsoft.Maui.IView) 4.28s (8.2%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorY(Android.Views.View,Microsoft.Maui.IView) These extension methods call `View.Context` twice: public static void UpdateTranslationY(this AView platformView, IView view) { if (platformView.Context == null) return; platformView.TranslationY = platformView.Context.ToPixels(view.TranslationY); } We can actually, make an overload for `ToPixels()` to where `View.Context` wouldn't be called *at all*: internal static float ToPixels (this View view, double dp) { if (s_displayDensity != float.MinValue) return (float)Math.Ceiling(dp * s_displayDensity); return view.Context.ToPixels(dp); } I used this everywhere I saw it appearing in `dotnet trace` output. Next, I saw `View.Context` being called a lot from `LayoutViewGroup` and `ContentViewGroup`. I could simply store the value in the constructor for these types, make it non-nullable, and remove null checks. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 64.23 Dopes/s After: 81.70 Dopes/s

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui I was reviewing a benchmark/sample that puts lots of labels on the screen that say "dope" and measures how many per second. Personally, I would have chosen some other word like `LOL`, so you could have a `LOLs/s` average. LOL? Reviewing `dotnet trace` output, I saw: 1.06s (6.3%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedLayoutDirection() 4.46ms (0.03%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedTheme() So approximately 6.3% of the time was spent querying if layouts are RTL or not? And 0.03% checking dark mode? I went through `AppInfoImplementation` on Android, and simply used `Lazy<T>` for every value that queries `Application.Context`. These values cannot change after the app launches, so they don't need to be computed on every call. If these values ever need to match a `Context` for multiple activities, we should re-evaluate this caching. A dictionary using a key of `Context.Handle` might work for that case. We can also remove places with `#if __ANDROID_24__` as they are always true in .NET 6. Runtime checks using `OperatingSystem` should be used going forward. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 55.42 Dopes/s After: 64.23 Dopes/s This should help the performance of `Label` in any .NET MAUI application running on Android.

Minimum API level is 21 in .NET 6

jonathanpeppers · 2022-06-14T21:27:05Z

@mattleibow ok, I understand now after asking in Teams. This can go to main.

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon dotnet#7996 and dotnet#8001, I noticed while profiling the sample app putting N `Label` on the screen: 405.02ms (2.3%) microsoft.maui!Microsoft.Maui.MauiContext.get_Context() 77.90ms (0.44%) microsoft.maui!Microsoft.Maui.MauiContext.get_Handlers() Meaning that around ~2.74% of the time was spent just calling these two properties. These properties hit Microsoft.Extensions each time to locate the service: public Android.Content.Context? Context => _services.GetService<Android.Content.Context>(); These are core-services that wouldn't change after startup, so should we just use `Lazy<T>` instead of doing a call like this each time? I also made use of `ANDROID`, as that is the preferred define to use in .NET 6+ instead of `__ANDROID__`: https://github.com/dotnet/designs/blob/a447d77bb53d189746ccd80c2d814064c2b6c606/accepted/2020/net5/net5.md#vary-implementation ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 81.70 Dopes/s After: 91.94 Dopes/s

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon dotnet#7996, dotnet#8001, and dotnet#8033, I noticed while profiling the sample app putting N Label on the screen: 783.92ms (6.2%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler(Microsoft.Maui.IViewHandler,double,double) So around %6 of the time spend just measuring. Looking through the call stack, I can see 3 JNI calls happening: 932.51ms (7.4%) mono.android!Android.Views.View.Measure(int,int) 115.53ms (0.91%) mono.android!Android.Views.View.get_MeasuredWidth() 96.97ms (0.77%) mono.android!Android.Views.View.get_MeasuredHeight() So, we could write a Java method that calls all three of these and somehow returns the `MeasuredWidth` and `MeasuredHeight`. After a little research, it seemed the best approach here was to "pack" two integers into a `long`. If we tried to return some Java object instead, then we'd have the same number of JNI calls to get the integers out. I found a couple links describing how to "pack" an `int` into a `long`: * Java: https://stackoverflow.com/a/12772968 * C#: https://stackoverflow.com/a/827267 Which after some testing, arrives at: public static long measureAndGetWidthAndHeight(View view, int widthMeasureSpec, int heightMeasureSpec) { view.measure(widthMeasureSpec, heightMeasureSpec); int width = view.getMeasuredWidth(); int height = view.getMeasuredHeight(); return ((long)width << 32) | (height & 0xffffffffL); } Unpacked in C# such as: var packed = PlatformInterop.MeasureAndGetWidthAndHeight(platformView, widthSpec, heightSpec); var measuredWidth = (int)(packed >> 32); var measuredHeight = (int)(packed & 0xffffffffL); Reducing 3 JNI calls in every `View`'s layout to 1. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 91.94 Dopes/s After: 102.45 Dopes/s After profiling again, it drops the % time spent in `GetDesiredSizeFromHandler`: 528.96ms (4.5%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler So the added math is negligible compared to reduced JNI calls.

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon #7996, #8001, and #8033, I noticed while profiling the sample app putting N Label on the screen: 783.92ms (6.2%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler(Microsoft.Maui.IViewHandler,double,double) So around %6 of the time spend just measuring. Looking through the call stack, I can see 3 JNI calls happening: 932.51ms (7.4%) mono.android!Android.Views.View.Measure(int,int) 115.53ms (0.91%) mono.android!Android.Views.View.get_MeasuredWidth() 96.97ms (0.77%) mono.android!Android.Views.View.get_MeasuredHeight() So, we could write a Java method that calls all three of these and somehow returns the `MeasuredWidth` and `MeasuredHeight`. After a little research, it seemed the best approach here was to "pack" two integers into a `long`. If we tried to return some Java object instead, then we'd have the same number of JNI calls to get the integers out. I found a couple links describing how to "pack" an `int` into a `long`: * Java: https://stackoverflow.com/a/12772968 * C#: https://stackoverflow.com/a/827267 Which after some testing, arrives at: public static long measureAndGetWidthAndHeight(View view, int widthMeasureSpec, int heightMeasureSpec) { view.measure(widthMeasureSpec, heightMeasureSpec); int width = view.getMeasuredWidth(); int height = view.getMeasuredHeight(); return ((long)width << 32) | (height & 0xffffffffL); } Unpacked in C# such as: var packed = PlatformInterop.MeasureAndGetWidthAndHeight(platformView, widthSpec, heightSpec); var measuredWidth = (int)(packed >> 32); var measuredHeight = (int)(packed & 0xffffffffL); Reducing 3 JNI calls in every `View`'s layout to 1. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 91.94 Dopes/s After: 102.45 Dopes/s After profiling again, it drops the % time spent in `GetDesiredSizeFromHandler`: 528.96ms (4.5%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler So the added math is negligible compared to reduced JNI calls.

Context: #7996 Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon my changes in #7996 (sample sample), I noticed: 7.60s (14%) mono.android!Android.Views.View.get_Context() 14% of the time is literally spent calling `View.Context`! We did a little investigation on the underlying Java interop, this is basically doing: 1. Call into JNI, get an `IntPtr`. 2. See if that `IntPtr` maps to a C# object that is already alive. 3. Return the C# object, or create a new one if needed. We can actually avoid all this work, in this case. For example: 5.48s (10%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorX(Android.Views.View,Microsoft.Maui.IView) 4.28s (8.2%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorY(Android.Views.View,Microsoft.Maui.IView) These extension methods call `View.Context` twice: public static void UpdateTranslationY(this AView platformView, IView view) { if (platformView.Context == null) return; platformView.TranslationY = platformView.Context.ToPixels(view.TranslationY); } We can actually, make an overload for `ToPixels()` to where `View.Context` wouldn't be called *at all*: internal static float ToPixels (this View view, double dp) { if (s_displayDensity != float.MinValue) return (float)Math.Ceiling(dp * s_displayDensity); return view.Context.ToPixels(dp); } I used this everywhere I saw it appearing in `dotnet trace` output. Next, I saw `View.Context` being called a lot from `LayoutViewGroup` and `ContentViewGroup`. I could simply store the value in the constructor for these types, make it non-nullable, and remove null checks. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 64.23 Dopes/s After: 81.70 Dopes/s

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon #7996 and #8001, I noticed while profiling the sample app putting N `Label` on the screen: 405.02ms (2.3%) microsoft.maui!Microsoft.Maui.MauiContext.get_Context() 77.90ms (0.44%) microsoft.maui!Microsoft.Maui.MauiContext.get_Handlers() Meaning that around ~2.74% of the time was spent just calling these two properties. These properties hit Microsoft.Extensions each time to locate the service: public Android.Content.Context? Context => _services.GetService<Android.Content.Context>(); These are core-services that wouldn't change after startup, so should we just use `Lazy<T>` instead of doing a call like this each time? I also made use of `ANDROID`, as that is the preferred define to use in .NET 6+ instead of `__ANDROID__`: https://github.com/dotnet/designs/blob/a447d77bb53d189746ccd80c2d814064c2b6c606/accepted/2020/net5/net5.md#vary-implementation ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 81.70 Dopes/s After: 91.94 Dopes/s

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon #7996, #8001, and #8033, I noticed while profiling the sample app putting N Label on the screen: 783.92ms (6.2%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler(Microsoft.Maui.IViewHandler,double,double) So around %6 of the time spend just measuring. Looking through the call stack, I can see 3 JNI calls happening: 932.51ms (7.4%) mono.android!Android.Views.View.Measure(int,int) 115.53ms (0.91%) mono.android!Android.Views.View.get_MeasuredWidth() 96.97ms (0.77%) mono.android!Android.Views.View.get_MeasuredHeight() So, we could write a Java method that calls all three of these and somehow returns the `MeasuredWidth` and `MeasuredHeight`. After a little research, it seemed the best approach here was to "pack" two integers into a `long`. If we tried to return some Java object instead, then we'd have the same number of JNI calls to get the integers out. I found a couple links describing how to "pack" an `int` into a `long`: * Java: https://stackoverflow.com/a/12772968 * C#: https://stackoverflow.com/a/827267 Which after some testing, arrives at: public static long measureAndGetWidthAndHeight(View view, int widthMeasureSpec, int heightMeasureSpec) { view.measure(widthMeasureSpec, heightMeasureSpec); int width = view.getMeasuredWidth(); int height = view.getMeasuredHeight(); return ((long)width << 32) | (height & 0xffffffffL); } Unpacked in C# such as: var packed = PlatformInterop.MeasureAndGetWidthAndHeight(platformView, widthSpec, heightSpec); var measuredWidth = (int)(packed >> 32); var measuredHeight = (int)(packed & 0xffffffffL); Reducing 3 JNI calls in every `View`'s layout to 1. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 91.94 Dopes/s After: 102.45 Dopes/s After profiling again, it drops the % time spent in `GetDesiredSizeFromHandler`: 528.96ms (4.5%) microsoft.maui!Microsoft.Maui.ViewHandlerExtensions.GetDesiredSizeFromHandler So the added math is negligible compared to reduced JNI calls.

* [essentials] use Lazy<T> for Android application-wide values Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui I was reviewing a benchmark/sample that puts lots of labels on the screen that say "dope" and measures how many per second. Personally, I would have chosen some other word like `LOL`, so you could have a `LOLs/s` average. LOL? Reviewing `dotnet trace` output, I saw: 1.06s (6.3%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedLayoutDirection() 4.46ms (0.03%) Microsoft.Maui.Essentials!Microsoft.Maui.ApplicationModel.AppInfoImplementation.get_RequestedTheme() So approximately 6.3% of the time was spent querying if layouts are RTL or not? And 0.03% checking dark mode? I went through `AppInfoImplementation` on Android, and simply used `Lazy<T>` for every value that queries `Application.Context`. These values cannot change after the app launches, so they don't need to be computed on every call. If these values ever need to match a `Context` for multiple activities, we should re-evaluate this caching. A dictionary using a key of `Context.Handle` might work for that case. We can also remove places with `#if __ANDROID_24__` as they are always true in .NET 6. Runtime checks using `OperatingSystem` should be used going forward. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 55.42 Dopes/s After: 64.23 Dopes/s This should help the performance of `Label` in any .NET MAUI application running on Android. * Remove IsAndroidVersionAtLeast(17) check Minimum API level is 21 in .NET 6

Context: #7996 Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon my changes in #7996 (sample sample), I noticed: 7.60s (14%) mono.android!Android.Views.View.get_Context() 14% of the time is literally spent calling `View.Context`! We did a little investigation on the underlying Java interop, this is basically doing: 1. Call into JNI, get an `IntPtr`. 2. See if that `IntPtr` maps to a C# object that is already alive. 3. Return the C# object, or create a new one if needed. We can actually avoid all this work, in this case. For example: 5.48s (10%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorX(Android.Views.View,Microsoft.Maui.IView) 4.28s (8.2%) microsoft.maui!Microsoft.Maui.Platform.TransformationExtensions.UpdateAnchorY(Android.Views.View,Microsoft.Maui.IView) These extension methods call `View.Context` twice: public static void UpdateTranslationY(this AView platformView, IView view) { if (platformView.Context == null) return; platformView.TranslationY = platformView.Context.ToPixels(view.TranslationY); } We can actually, make an overload for `ToPixels()` to where `View.Context` wouldn't be called *at all*: internal static float ToPixels (this View view, double dp) { if (s_displayDensity != float.MinValue) return (float)Math.Ceiling(dp * s_displayDensity); return view.Context.ToPixels(dp); } I used this everywhere I saw it appearing in `dotnet trace` output. Next, I saw `View.Context` being called a lot from `LayoutViewGroup` and `ContentViewGroup`. I could simply store the value in the constructor for these types, make it non-nullable, and remove null checks. ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 64.23 Dopes/s After: 81.70 Dopes/s

Context: https://github.com/unoplatform/performance/tree/master/src/dopes/DopeTestMaui Building upon #7996 and #8001, I noticed while profiling the sample app putting N `Label` on the screen: 405.02ms (2.3%) microsoft.maui!Microsoft.Maui.MauiContext.get_Context() 77.90ms (0.44%) microsoft.maui!Microsoft.Maui.MauiContext.get_Handlers() Meaning that around ~2.74% of the time was spent just calling these two properties. These properties hit Microsoft.Extensions each time to locate the service: public Android.Content.Context? Context => _services.GetService<Android.Content.Context>(); These are core-services that wouldn't change after startup, so should we just use `Lazy<T>` instead of doing a call like this each time? I also made use of `ANDROID`, as that is the preferred define to use in .NET 6+ instead of `__ANDROID__`: https://github.com/dotnet/designs/blob/a447d77bb53d189746ccd80c2d814064c2b6c606/accepted/2020/net5/net5.md#vary-implementation ~~ Results ~~ A `Release` build on a Pixel 5 device, I was getting: Before: 81.70 Dopes/s After: 91.94 Dopes/s

mattleibow · 2023-03-15T13:56:56Z

Some of the APIs should not have been cached - theme and layout direction. These have been reverted in #11200

That PR was not a plain revert and instead cache the values in Controls where we get events when the theme changes.

jonathanpeppers requested review from PureWeen and mattleibow June 13, 2022 15:48

Eilon added the area-essentials Essentials: Device, Display, Connectivity, Secure Storage, Sensors, App Info label Jun 13, 2022

hartez added this to the 6.0-servicing milestone Jun 13, 2022

jonathanpeppers mentioned this pull request Jun 13, 2022

[android] avoid View.Context where unecessary #8001

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akoeplinger reviewed Jun 13, 2022

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mattleibow approved these changes Jun 14, 2022

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jonathanpeppers added 2 commits June 14, 2022 16:26

Remove IsAndroidVersionAtLeast(17) check

a698ac7

Minimum API level is 21 in .NET 6

jonathanpeppers changed the base branch from net7.0 to main June 14, 2022 21:26

jonathanpeppers requested a review from a team as a code owner June 14, 2022 21:26

jonathanpeppers force-pushed the AppInfo.android branch from 1c63a3c to a698ac7 Compare June 14, 2022 21:26

jonathanpeppers mentioned this pull request Jun 15, 2022

[core] use Lazy<T> for MauiContext properties #8033

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[android] reduce JNI calls during layout measurement #8034

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jonathanpeppers requested a review from mattleibow June 15, 2022 19:04

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mattleibow merged commit 4e29fd2 into dotnet:main Jun 16, 2022

mattleibow modified the milestones: 6.0-servicing, 6.0-sr2 Jun 16, 2022

mattleibow self-assigned this Jun 16, 2022

jonathanpeppers deleted the AppInfo.android branch June 16, 2022 02:43

jonathanpeppers mentioned this pull request Jun 21, 2022

CollectionView - slow scrolling, laggy performance #8012

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mattleibow mentioned this pull request Mar 15, 2023

Cache the dynamic AppTheme value in Controls (and not Essentials) #11200

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[essentials] use Lazy<T> for Android application-wide values#7996

[essentials] use Lazy<T> for Android application-wide values#7996
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