Ionic + CreateJs high CPU and Memory - ionic-framework

I have a serious problem with an increasing CPU and RAM usage in an ionic app with createjs library. The problem cause the app to crash after a while.
As I am navigating between pages where each page has a new canvas, I see the RAM and CPU to dramatically increase.
There is no memory leak. I have tested it with chrome developer tools.

After so so much testing, the solution was to treat each template page in ionic as a root page. So when I was navigating to a new template page I always did:
$ionicHistory.nextViewOptions({
historyRoot: true,
disableBack: true
});
$ionicHistory.clearCache();
createjs.Tween.removeAllTweens();
$scope.stage.removeAllEventListeners();
$scope.stage.removeAllChildren();
$state.go("lesson", {}, {reload: true});
This way all cache that ionic kept was cleared and every event, tween motion and element in createjs was cleared too.
This increased the speed of the app drammatically!

Related

How to clear heap memory in flutter web?

Im working on flutter web.I need to know how to clear heap memory in flutter web.
I have used simple text widget but it takes 144mb as heap.
I dont know where from it comes.
My code:
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'Demo',
home: Text('hi'),
));
}
I have attached pictures for reference
kindly tell me how to clear this memory.
If what you're asking is how to run flutter on web such that it consumes less memory at the outset, the answer may be to run it in release mode using the html renderer rather than the canvas renderer. (More on renderers: https://flutter.dev/docs/development/tools/web-renderers)
flutter run -d chrome --web-renderer html --release
This worked for me. Running a simple hello world app, my heap was measuring ~150mb even in release mode. Then, I switched to html renderer. Now, in debug mode the heap is ~60mb. In release mode it's ~7mb.
Two points here:
My assumption is that you are running application in debug mode. In debug mode application includes a lot of things for debugging purposes that will not be included in your release app. For instance, application that I am working on on start with log in screen takes ~100Mb in debug mode, while it takes only ~20Mb in release mode. So try to compile your app in release mode and see.
I do not think you can clear memory. Dart has GC (garbage collector) that does it for you. All you need to do as developer is to make sure you do not have objects that can not be garbage collected and thus remain in heap of VM causing memory leak over time.

Chrome Packaged App still throttled in foreground

It is well known that Chrome intentionally throttles javascript setTimeout calls for background tabs to a minimum of 1 second, however very recently (Chrome 75 on MacOS 10.13), I have found that my Chrome App is still throttled after returning to the foreground and remains throttled until I close and reopen it, after which setTimeout works as expected.
This does not happen unless the app has previously been in the background or unused for a considerable period of time (e.g. hours). My issue is that returning it to the foreground (i.e. interacting with it) does not speed up its behaviour and I would rather not require my users to close and reopen it.
I have read in other questions on this topic that continually playing audio is a work around. Please can someone point me in the direction of an example of how this can be done natively in a Chrome App i.e. without adding too much bloat.

Heap memory increasing in each page load in chrome

I am getting aw snap or sometimes not enough memory problem when I reload my WebGL page. I have a WebGL project which is empty (just a camera + light), developed in unity3d. I am reloading it, and profile its memory.
As you can see that its load 1.2MB in the first load than 1281 MB in second then 1574 then 2160 and then get crash. I am amazed that why it is happening?
I searched and found that
One of Unity fellows told that when browser Dev Tool is open, each page reload will increment the memory:
"
One point to note is that when profiling memory usage on page reloads
in Firefox, make sure to have the Firefox web console (and debugger)
window closed. Firefox has a behavior that if web console is open, it
keeps the Firefox JS debugger alive, which pins all visited pages to
be cached in memory, never reclaiming them. Closing the Firefox web
page console allows freeing the old pages from memory
BUT
My testing suggests that it is true for Chrome but not for firefox. Firefox keeps increments the memory with each page reload no matter your Dev tools are open or close.
But my problem resolve in chrome (still question on firefox? I guess it the default behaviour of browser), after closing the dev tools memory is not incremented on chrome.
the problem
the webgl build runs fine on every desktop browser and firefox mobile, but crashes after 3 seconds when using chrome mobile or safari mobile with the "aw, snap" page.
the problem was the amount of RAM that the project was using for loading assets.
i found that the main problem was loading the audio system.
when the game started the RAM usage quickly escalated from 300 MB to 1,3GB.
how i fixed
i had a background music 20 minutes long, i cut that to 5 minutes.
click the music, then click override for webgl
set the load type to Streaming
set the quality to 1
with this workaround the RAM usage floats around 600 MB, this allows the build to run on mobile.
this is an example
EDIT
turns out that after ios 15.5 update everything runs fine.

ionic2+ app with crosswalk has high CPU usage in idle state

I am using crosswalk to better support older android devices. But app has 5% CPU even doing nothing and even in idle state on background.
Removing crosswalk from project solves problem, but I want it to stay included because of the benefits.
I have found two things what makes the CPU.
1. animated gif image
2. bug in ionic wrapper of device motion cordova plugin (acceleration watcher never stop then)
animated gif: I had animated gif as loading spinner in my index.html while my app becomes available. On mobile phones it was not visible at all, because splash screen is turned off after app init, but it was for browser use. Removing this gif solves about 3% CPU
I have device motion plugin in my app and I was using it as described in ionic docs, so if not needed anymore I have called unsubscribe. But ionic was not calling clearWatch method correctly (with wathID parameter), so the watcher never stops. It caused another ~3% CPU. As an workaround I have used plugin directly, bypassing ionic wrapper as described in cordova docs.
Removing those two problems I get approximately 0.4% CPU which I think is the lowest minimum, because I have tested empty index.html builded into cordova app even without the crosswalk and still getting the minimum 0.4% CPU usage.
Hope that this help someone else, happy coding ;)

Progressive Web App, I am trying to maintain same screen when minimize or maximize in iphone

In Android, When I minimize and maximize, the app maintain the same screen what I saw previously.
In iPhone, When I minimize and maximize, The app not maintaining the same screen. reload from home screen.
Full screen implementation web app for IOS is quite different when compared to that of android. If you are running your web app in full screen mode in IOS, minimize the app and maximize again, IOS considers it as fresh start so all the session cookies(cookies having session as timeout) will be cleared on minimize. so if you have cookies related to session, they all will be cleared. However you can try implementing html caching(using cache.manifest) to cache the pages. I've not personally implemented this but it might help. All the best