![]() While running, the profiler records the application state when objects are placed on the heap. Note: If you’re on Windows, use Java Flight Recorder for allocation profiling. But that’s not all – starting with version 2.0, which is integrated into IntelliJ IDEA, we get the ability to profile memory allocations as well. Let’s run the application with Async Profiler attached. Since we know our application never gets enough memory, we might want to analyze its memory usage. The only visible effect of extra memory was that we delayed the end of the “party”. However, regardless of the available memory, the parrot runs out of memory anyway. This supports our hypothesis that there are no objects eligible for garbage collection.Ī naïve solution would be to just add more memory. Memory usage does not go down after our app reaches the plateau. We can test it by requesting garbage collection from CPU and memory live charts. If the saw teeth become too frequent, it means that the garbage collector is having a hard time trying to reclaim the memory. You can see an example of this in the picture below: Usually, the memory usage curve is saw-shaped: the chart goes up when new objects are allocated and periodically goes down when the memory is reclaimed by the garbage collector. This is precisely the moment when the animation hangs, and there seems to be no way out of this. Indeed, we see that the memory usage is going up continually before reaching a plateau. Let’s open the charts for our parrot app and see if we can spot anything when the animation freezes. ![]() They allow us to visualize real-time resources usage for the processes that are running. Since we are getting an OutOfMemoryError, a good starting point for analysis is CPU and Memory Live Charts. Clearly, we need to try another approach. We don’t even know if the threads are waiting for a lock or have just finished their current work. Unfortunately, this did not tell us much because all the threads involved in the parrot party are in the waiting state. Let’s try using the debugger! Launch the application in debug mode, wait until the animation freezes, then hit Pause. The result may differ on other JVMs or even on Corretto 11 if it uses a custom configuration. Important: We run this using Amazon Corretto 11. The interesting thing about the animation freeze is that we can still use the rest of the UI. There is no reliable way of telling how exactly the problem will manifest itself. There can also be a OutOfMemoryError, whose stack trace doesn’t tell us anything about the origin of the problem. However, it’s not long before things start going wrong.Īfter working for some time, the animation freezes with no indication of what the cause is. The app seems to work well: you can tweak the animation color and speed. Launch the application using the Parrot run configuration included with the project. Let’s start with cloning the following repository: To use the profiling tools, make sure you have IntelliJ IDEA Ultimate. Note: This post shows how to use features of both the Community and Ultimate versions of IntelliJ IDEA. In this post, we’ll look at how we can use some of IntelliJ IDEA’s built-in tools to investigate a runtime problem. They can point you in the right direction. A smarter approach would be to use the tools you have at hand. Discotainment makes your party a Hue Disco! iConnectHue is an essential ingredient for your Hue system brings you an ultimate feature-set packed in a clean and intuitive interface, which just received a better design with version 4 to give you a fantastic user experience with Philips Hue on iOS.We often find ourselves in situations where code is not working properly, and we have no idea where to even begin investigating.Ĭan’t we just stare at the code until the solution eventually comes to us? Sure, but this method probably won’t work without deep knowledge of the project and a lot of mental effort. A sleep timer is ready to go with just two taps! The group-feature comes in handy to organize multiple Hue lights. iConnectHue has intelligent timers to activate Hue-Lamps at sunrise, sunset or any defined time – you can even let a timer recognize if you are at home or only act if your group is on or off. Playing with colors, effects and dynamic animations is pure entertainment! Enhance switches like Hue Tap/Dial Switch, Hue Dimmer, Smart Button, Friends of Hue, Motion Sensors and Lutron Aurora with multiple functions such as brightness, scenes, switch on/off or even optional color-animations. Philips Hue lights are more fun with iConnectHue – the best app for iPhone- and iPad to manage your Hue-Lights.
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