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[Xamarin.Android.Build.Tasks] should Dispose AssemblyDefinition - #2148
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Reviewing our codebase, we found a place where the `BuildApk` task was
calling an overload for `MonoAndroidHelper.IsReferenceAssembly`.
This presented two problems:
1. It was using the `InMemory` option
2. We were not calling `Dispose()`!
Case No.1 was bad, since we basically load every assembly into memory!
foreach (ITaskItem assembly in ResolvedUserAssemblies) {
if (MonoAndroidHelper.IsReferenceAssembly (assembly.ItemSpec)) {
//...
foreach (ITaskItem assembly in ResolvedFrameworkAssemblies) {
if (MonoAndroidHelper.IsReferenceAssembly (assembly.ItemSpec)) {
Likewise, we need to call `Dispose` here, since a lock could be held
on the file here on Windows.
The changes here made `BuildApk` slower (and more correct!), but the
overall build time better.
Before:
5890 ms BuildApk 1 calls
Time Elapsed 00:01:02.59
After:
6377 ms BuildApk 1 calls
Time Elapsed 00:00:59.37
I think the `AssemblyDefinition` instances must have been getting
cleaned up later in the build by the GC (if we were lucky), and also
used *a lot* more memory. This would contribute to overall build time.
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|
Logs here: AssemblyDefinitionDispose.zip |
StephaneDelcroix
approved these changes
Sep 6, 2018
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Reviewing our codebase, we found a place where the
BuildApktask wascalling an overload for
MonoAndroidHelper.IsReferenceAssembly.This presented two problems:
InMemoryoptionDispose()!Case No.1 was bad, since we basically load every assembly into memory!
Likewise, we need to call
Disposehere, since a lock could be heldon the file here on Windows.
The changes here made
BuildApkslower (and more correct!), but theoverall build time better.
Before:
After:
I think the
AssemblyDefinitioninstances must have been gettingcleaned up later in the build by the GC (if we were lucky), and also
used a lot more memory. This would contribute to overall build time.