Investigate size increase for Android libmonosgen-2.0.so between net6.0 and 7.0 #68330
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Tagging subscribers to 'arch-android': @steveisok, @akoeplinger Issue DetailsAs noticed in dotnet/android#6598 (comment) we're seeing about a 1.5MB size increase for libmonosgen-2.0.so for 7.0. According to bloaty most of the size increase is from the $ bloaty Microsoft.NETCore.App.Runtime.Mono.android-arm64.7.0.0-preview.5.22220.8/runtimes/android-arm64/native/libmonosgen-2.0.so -- Microsoft.NETCore.App.Runtime.Mono.android-arm64.6.0.4/runtimes/android-arm64/native/libmonosgen-2.0.so
FILE SIZE VM SIZE
-------------- --------------
+57% +1.28Mi +57% +1.28Mi .text
+55% +115Ki +55% +115Ki .eh_frame
+71% +35.9Ki +71% +35.9Ki .eh_frame_hdr
[NEW] +6.98Ki [NEW] +6.92Ki .got.plt
+18% +2.86Ki +18% +2.86Ki .data
+19% +2.00Ki +20% +2.00Ki .hash
+3.6% +744 +3.6% +744 .rela.pltOne theory is that the NDK version is the culprit, we used r21b in 6.0 and in 7.0 we use r23b. @grendello is taking a look at that.
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This turned out to be the cmake version, the current cmake version 3.17 we use prints this warning: After updating to the latest cmake 3.23.1 the size is back to the expected one and the warning is gone. |
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cmake 3.17 doesn't work well with newer Android NDK and results in increased binary size, see dotnet/runtime#68330
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cmake 3.17 doesn't work well with newer Android NDK and results in increased binary size, see dotnet/runtime#68330
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Context: dotnet/runtime#56989 Context: dotnet/runtime#68734 Context: dotnet/runtime#68914 Context: dotnet/runtime#68701 Changes: dotnet/installer@04e40fa...c7afae6 % git diff --shortstat 04e40fa9...c7afae69 98 files changed, 1788 insertions(+), 1191 deletions(-) Changes: dotnet/runtime@a21b9a2...c5d40c9 % git diff --shortstat a21b9a2d...c5d40c9e 28347 files changed, 1609359 insertions(+), 1066473 deletions(-) Changes: dotnet/linker@01c4f59...04c49c9 % git diff --shortstat 01c4f590...04c49c9d 577 files changed, 28039 insertions(+), 10835 deletions(-) Updates to build with the .NET 7 SDK and use the runtime specified by the SDK. We no longer use different SDK & runtime versions. This produces a 7.0.100 Android workload. After this is merged we should be able to enable Maestro to consume future .NET 7 builds from dotnet/installer/main. ~~ Known Issues ~~ AOT+LLVM crashes on startup: * dotnet/runtime#68914 Xamarin.Build.Download hits a breaking change with `ZipEntry`: * dotnet/runtime#68734 * xamarin/XamarinComponents#1368 illink outputs different MVIDs per architecture: * dotnet/linker#2203 * dotnet/runtime#67660 Size of `libmonosgen-2.0.so` regressed: * dotnet/runtime#68330 * dotnet/runtime#68354 Newer .NET 7 builds crash on startup: * dotnet/runtime#68701 * This is worked around by *disabling* lazy loading of AOT'd assemblies 6dc426f. * TODO: re-enable once we get a fixed .NET 7 runtime. TODO: We can't yet push to the `dotnet7` feed. Working on this. Co-authored-by: Jonathan Peppers <[email protected]> Co-authored-by: Peter Collins <[email protected]>
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Brings in new cmake 2.23.1 and Android NDK 23c. Set the optimization level to O2 to fix size/perf regression. Fixes dotnet#68330
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Brings in new cmake 2.23.1 and Android NDK23c which fixes an issue with the binary size and perf of libmonosgen-2.0.so In NDK23b they decided to no longer pass -O2 compiler optimization flag (for arm64, armv7 used -Oz) as part of the Android toolchain but delegate to upstream CMake behavior: https://github.com/android/ndk/wiki/Changelog-r23 and android/ndk#1536 CMake defaults to -O3 for Release builds but unfortunately this causes quite a noticable binary size increase and perf regression. The Xamarin Android team measured startup time on an average of 10 runs of `dotnet new maui` on a Pixel 5: ``` -O3: 893.7ms -O2: 600.2ms -Oz: 649.1ms ``` We now explicitly pass in -O2 for Android builds. Fixes #68330
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As noticed in dotnet/android#6598 (comment) we're seeing about a 1.5MB size increase for libmonosgen-2.0.so for 7.0.
According to bloaty most of the size increase is from the
.textsection:$ bloaty Microsoft.NETCore.App.Runtime.Mono.android-arm64.7.0.0-preview.5.22220.8/runtimes/android-arm64/native/libmonosgen-2.0.so -- Microsoft.NETCore.App.Runtime.Mono.android-arm64.6.0.4/runtimes/android-arm64/native/libmonosgen-2.0.so FILE SIZE VM SIZE -------------- -------------- +57% +1.28Mi +57% +1.28Mi .text +55% +115Ki +55% +115Ki .eh_frame +71% +35.9Ki +71% +35.9Ki .eh_frame_hdr [NEW] +6.98Ki [NEW] +6.92Ki .got.plt +18% +2.86Ki +18% +2.86Ki .data +19% +2.00Ki +20% +2.00Ki .hash +3.6% +744 +3.6% +744 .rela.pltOne theory is that the NDK version is the culprit, we used r21b in 6.0 and in 7.0 we use r23b. @grendello is taking a look at that.
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