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g

gbaldeck

03/26/2021, 3:18 AM
I'm having an issue with my compose app and too much CPU being used. There should be less than 1% of the CPU used but it is up to 20% in some cases and other apps slow down quite a bit. I do not believe this is a problem with compose or coroutines, but it may be a problem with how I am using them. The below links with line numbers show the chain of how I'm using a task that runs in a background coroutine. Does anyone know how I can optimize this? 1. Line 45 of https://github.com/recursiveg87/Grim-Locations/blob/master/src/main/kotlin/io/grimlocations/ui/view/EditorView.kt 2. Line 37 of https://github.com/recursiveg87/Grim-Locations/blob/master/src/main/kotlin/io/grimlocations/ui/viewmodel/event/EditorEvents.kt 3. Line 81 of https://github.com/recursiveg87/Grim-Locations/blob/master/src/main/kotlin/io/grimlocations/ui/viewmodel/reducer/EditorReducers.kt 4. Line 95 of https://github.com/recursiveg87/Grim-Locations/blob/master/src/main/kotlin/io/grimlocations/ui/viewmodel/reducer/EditorReducers.kt 5. LaunchEffect wrapper I used in item 1. https://github.com/recursiveg87/Grim-Locations/blob/master/src/main/kotlin/io/grimlocations/framework/util/LaunchedEffect.kt To give some more background on what I'm trying to do here. I am detecting if an app is running, and if it is I check if a file was changed, if it was then I load the file's contents into the compose app.
z

Zach Klippenstein (he/him) [MOD]

03/26/2021, 3:32 AM
Pro tip: you can link to specific lines in GitHub
First off,
startGDProcessCheckLoop
creating its own root scope is a red flag. Defeats the purpose of calling it from a launched effect, breaks structured concurrency, introduces memory and other resource leaks. It should be a suspend function. And the coroutine started by launched effect is already running on the main dispatcher.
That launched effect wrapper is a bit of smell too. It takes a key for a reason, and in this case you probably want to pass in
vm
as the key since the caller could pass a different instance in at any time, and if they did then youd leak the launched coroutine from the last one.
Have you run your program through a profiler? That will be a much easier way to figure out what’s eating all your cpu than trying to figure it out by hand
g

gbaldeck

03/26/2021, 5:03 AM
Hi, thanks for the replies. Passing the vm as the key is a great idea and I'll keep that in mind. But in this case there is only ever one instance of that vm created by my vm manager. So I don't believe that is effecting it. The coroutine scope you mentioned I can get rid of. And no I haven't used a profiler and don't have experience with any. I will take a look around for one.
o

olonho

03/26/2021, 7:41 AM
IDEA got rather cool Async Profiler, see https://www.jetbrains.com/help/idea/async-profiler.html
:thank-you: 1
c

christophsturm

03/26/2021, 11:34 AM
java flight recorder is also pretty cool and comes with the jdk
:thank-you: 1
t

theapache64

03/27/2021, 3:21 PM
@olonho but that's for only ultimate version, right? 😭
g

gbaldeck

03/27/2021, 4:09 PM
@Zach Klippenstein (he/him) [MOD] I'm not sure the underlying mechanics, but your suggestions fixed the issue. It now doesn't go above 2% CPU. Thanks for your help
🎉 3