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[Xamarin.Android.Build.Tasks] Profiled AOT can Full AOT the main asse…
…mbly (#6482) When using the built-in profiles for Profiled AOT, one drawback is the user's code isn't AOT'd. We only AOT types that are called in the BCL, `Java.Interop.dll`, `Mono.Android.dll`, etc. To make this better, we can AOT the "main" assembly. Most code in the users' main assembly would likely get called on startup. This should have a minor impact to `.apk` size, but gain us a better startup boost by default. When testing, I can see more methods AOT'd: 11-11 09:01:01.441 16386 16386 D Mono : AOT: FOUND method foo.MainActivity:OnCreate (Android.OS.Bundle) [0x7c050e8e20f0 - 0x7c050e8e213b 0x7c050e8e2673] ~~ Results ~~ | Test | File Size (Δ) | Activity Displayed (Δ) | | ------------------------------------- | ----------------: | ------------------------: | | `dotnet new android` w/o AOT app | -baseline- | 193ms | | `dotnet new android` *with* AOT app | (0%) | 192ms (99%) | | `dotnet new maui` w/o AOT app | -baseline- | 641ms | | `dotnet new maui` *with* AOT app | +20,480 (0.14%) | 627ms (98%) | The `dotnet new android` app is built with: > dotnet build -c Release -p:AndroidEnableProfiledAot=true -p:RunAOTCompilation=true -r android-arm64 -p:AndroidPackageFormat=apk File size differences: > apkdiff -f before.apk after.apk Size difference in bytes ([*1] apk1 only, [*2] apk2 only): + 5,632 lib/arm64-v8a/libaot-foo.dll.so + 5 assemblies/assemblies.blob Summary: + 5 Other entries 0.00% (of 787,048) + 0 Dalvik executables 0.00% (of 345,340) + 5,632 Shared libraries 0.09% (of 6,008,168) + 0 Package size difference 0.00% (of 3,169,571) 10 runs on a Pixel 5 was an average of 193ms before, and 192ms after (the `Activity Displayed` time). There may not, in fact, be a difference for `dotnet new android`. Next I installed .NET MAUI 6.0.101-preview.11.2149, and tried a `dotnet new maui` app: File size: > apkdiff -f before.apk after.apk Size difference in bytes ([*1] apk1 only, [*2] apk2 only): + 67,144 lib/arm64-v8a/libaot-foo.dll.so Summary: + 0 Other entries 0.00% (of 7,765,174) + 0 Dalvik executables 0.00% (of 6,443,152) + 67,144 Shared libraries 0.50% (of 13,388,688) + 20,480 Package size difference 0.14% (of 14,272,332) Total file size difference: --14,251,852 ++14,272,332 The average over 10 runs on a Pixel 5, before applying this change, is ~641ms. After applying this change, it's ~627ms. I think this might help startup by ~14ms in a `dotnet new maui` app. It would likely improve more depending on the app.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| using System.IO; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.Android.Build.Tasks; | ||
| using Xamarin.Android.Tools; | ||
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| namespace Xamarin.Android.Tasks | ||
| { | ||
| /// <summary> | ||
| /// Called in .NET 6+ to populate %(AotArguments) metadata in the ResolvedAssemblies [Output] property. | ||
| /// </summary> | ||
| public class GetAotAssemblies : GetAotArguments | ||
| { | ||
| public override string TaskPrefix => "GAOT"; | ||
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| public override Task RunTaskAsync () | ||
| { | ||
| NdkTools? ndk = NdkTools.Create (AndroidNdkDirectory, Log); | ||
| if (ndk == null) { | ||
| return Task.CompletedTask; // NdkTools.Create will log appropriate error | ||
| } | ||
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| bool hasValidAotMode = GetAndroidAotMode (AndroidAotMode, out AotMode); | ||
| if (!hasValidAotMode) { | ||
| LogCodedError ("XA3002", Properties.Resources.XA3002, AndroidAotMode); | ||
| return Task.CompletedTask; | ||
| } | ||
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| if (AotMode == AotMode.Interp) { | ||
| LogDebugMessage ("Interpreter AOT mode enabled"); | ||
| return Task.CompletedTask; | ||
| } | ||
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| TryGetSequencePointsMode (AndroidSequencePointsMode, out SequencePointsMode); | ||
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| SdkBinDirectory = MonoAndroidHelper.GetOSBinPath (); | ||
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| var abi = AndroidRidAbiHelper.RuntimeIdentifierToAbi (RuntimeIdentifier); | ||
| if (string.IsNullOrEmpty (abi)) { | ||
| Log.LogCodedError ("XA0035", Properties.Resources.XA0035, RuntimeIdentifier); | ||
| return Task.CompletedTask; | ||
| } | ||
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| (_, string outdir, string mtriple, AndroidTargetArch arch) = GetAbiSettings (abi); | ||
| string toolPrefix = GetToolPrefix (ndk, arch, out int level); | ||
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| var aotOptions = GetAotOptions (ndk, arch, level, outdir, mtriple, toolPrefix); | ||
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| var aotProfiles = new StringBuilder (); | ||
| if (Profiles != null && Profiles.Length > 0) { | ||
| aotProfiles.Append (",profile-only"); | ||
| foreach (var p in Profiles) { | ||
| var fp = Path.GetFullPath (p.ItemSpec); | ||
| aotProfiles.Append (",profile="); | ||
| aotProfiles.Append (fp); | ||
| } | ||
| } | ||
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| var arguments = string.Join (",", aotOptions); | ||
| foreach (var assembly in ResolvedAssemblies) { | ||
| var temp = Path.GetFullPath (Path.Combine (outdir, Path.GetFileNameWithoutExtension (assembly.ItemSpec))); | ||
| Directory.CreateDirectory (temp); | ||
| if (Path.GetFileNameWithoutExtension (assembly.ItemSpec) == TargetName) { | ||
| LogDebugMessage ($"Not using profile(s) for main assembly: {assembly.ItemSpec}"); | ||
| assembly.SetMetadata ("AotArguments", $"{arguments},temp-path={temp}"); | ||
| } else { | ||
| assembly.SetMetadata ("AotArguments", $"{arguments},temp-path={temp}{aotProfiles}"); | ||
| } | ||
| } | ||
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| return Task.CompletedTask; | ||
| } | ||
| } | ||
| } |
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