I expirence some performance problems related to `...

# compose

[semoro]

I expirence some performance problems related to @Preview in Android Studio 4.1 Canary 4
There is some freezes on typing, which is caused by @Preview annotation discovery, I have thread dumps for it
Also, there is some memory leak happens, as after few hours of work AS consumes 4-5 Gb of RAM, can provide heap analysis dump

[semoro]

1. Memory leaks
There are a lot of some disposal exceptions, which could be related,
thrown every time I hit refresh button in preview

2020-04-01 23:31:32,301 [4536717]  ERROR - ea.rendering.LayoutlibCallback - Error while disposing a RenderSession 
java.lang.IllegalStateException: Node should be attached to an owner
	at androidx.ui.core.ComponentNodesKt.requireOwner(ComponentNodes.kt:1734)
	at androidx.ui.core.AndroidComposeView.requestRelayout(AndroidOwner.kt:289)
	at androidx.ui.core.AndroidComposeView.access$requestRelayout$0(AndroidOwner.kt)
	at androidx.ui.core.AndroidComposeView$onCommitAffectingLayout$1.invoke(AndroidOwner.kt:156)
	at androidx.ui.core.AndroidComposeView$onCommitAffectingLayout$1.invoke(AndroidOwner.kt)
	at androidx.ui.core.ModelObserver$CommitMap.callOnCommit(ModelObserver.kt:240)
	at androidx.ui.core.ModelObserver.callOnCommit(ModelObserver.kt:204)
	at androidx.ui.core.ModelObserver.access$callOnCommit$2(ModelObserver.kt)
	at androidx.ui.core.ModelObserver$commitObserver$1$1.invoke(ModelObserver.kt:59)
	at androidx.ui.core.ModelObserver$commitObserver$1$1.invoke(ModelObserver.kt)
	at androidx.ui.core.AndroidOwnerKt$sam$java_lang_Runnable$0.run(AndroidOwner.kt)
	at android.os.Handler_Delegate.dispose(Handler_Delegate.java:132)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.dispose(RenderSessionImpl.java:1188)
	at com.android.layoutlib.bridge.BridgeRenderSession.dispose(BridgeRenderSession.java:205)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

[semoro]

2. Freezes

freezes.zip

[semoro]

1. Memory leaks
Analyze memory not working for me, with some cryptic Swing exceptions, but in hprof I see a lot of
com.android.layoutlib.bridge.android.BridgeContext

If you need .hprof, I could upload it to GDrive

[semoro]

It is just single object path, while I have 49 of them with almost same path

Paths-from-"GC-Roots"-to-"BridgeContext".txt

[caelum19]

You still getting these on canary 5?

[caelum19]

I am not but I never actually installed canary 4 so maybe I wasn't getting them then either

[Kazemihabib1996]

Canary 4 used to crash every 15-20 minutes for me, I'm using Canary 5 for hours, still without crash.
(Windows 10)

[semoro]

Sure, because there are still same code

[nosuid]

hey, yes, thanks for lettings us know. We are aware of the memory issues cause by the interaction of the Preview with some of the Compose code and we are working through them.
For the freezes, we did some small fixes but need to rewrite a bit of the code for the annotation finding.

[caelum19]

Out of curiosity, are you guys using Android studio for your own testing? Is there a less elegant solution without the freezes ? 😄