If you're curious, attach VisualVM and watch the RAM usage graph. You'll notice that Java performs garbage collections long before reaching allocating the maximum amount of RAM allocated, and you can't even feel any performance issue in-game. Source: 10 months ago
Hangs and deadlocks are significantly harder to debug. A first step is taking a thread dump so you can see what each thread in the JVM is currently trying to do. I like VisualVM for this, you can also use the command-line tools jps -l (to list all Java PIDs) and jstack for taking a thread dump. Source: 10 months ago
The Java VisualVM project is an advanced dashboard for Memory and CPU monitoring. It features advanced resource visualization, as well as process and thread utilization. - Source: dev.to / 11 months ago
This sounds like a server thread freeze/deadlock/crash or something. I think I would start debugging this using a tool like VisualVM; attach it to the game, wait for the hang, take a thread dump, and check what the server thread is up to. Source: 12 months ago
Just wanted to chip in to say that /u/UtilFunction is correct. The proper way to measure memory consumption of any Java application independent of which garbage collector is used is to perform a heap dump (which automatically forces a complete garbage collection). I like to use VisualVM for that. Source: 12 months ago
It's the JVM that allocates and free's memory through GC depending on what the application needs or doesn't need at a time. The memory raising for a while and then getting freed can be normal behaviour for an application (saw-pattern). If you suspect a memory-leak you can monitor the application e.g. By connecting to it via VisualVM or JMC. You can manually kick-off a GC-cycle and see if it drops to a base-level... Source: about 1 year ago
My usual strategy in case of Minecraft performance problems is to look around the process with a Java profiler like VisualVM. That can tell you what the game is spending most of its CPU time on, and then you can make an informed decision on what's wrong. Source: about 1 year ago
I used SpringBoot 3.0.2, GraalVM 22 (JVM mode), a MacOS 2,6 GHz 6-Core Intel Core i7, running 1000 users for 5 minutes. The idea was to test how memory consumption and CPU usage evolve. Below, I compared the footprint of these three solutions. I collected the total count of requests, throughput, memory consumption, and CPU usage using VisualVM and Gatling. - Source: dev.to / about 1 year ago
VisualVM (free tool maintained by Oracle). - Source: dev.to / about 1 year ago
Tuning the garbage collector often requires some trial and error. If you want to get more insight into what the garbage collector is doing and how the memory is being used you can use visualvm to monitor ToS. Source: about 1 year ago
After executing a load test that invokes for 60 seconds an @Aync and @Bulkhead annotated method, you can see from a profiling tool picture, that the application only used 34 out of 514 created threads. This obviously represents a waste of resources. - Source: dev.to / over 1 year ago
> I had to pay real money to get the Java profiler I used at AWS and while it worked, it was klunky, not fun to use. VisualVM is quite good for Java/JVM profiling. - Source: Hacker News / almost 2 years ago
Another common example would be clicking the Heap Dump button on the Monitor tab in VisualVM. - Source: dev.to / almost 2 years ago
Having said that, you can just install the specific tools that you want. For example you can just download jvisualvm here, which will give you profiling and JMX. In fact - for jvisualvm - if you specify the right RMI parameters on your app (as system properties) then you don't even need to put the software on the box: you can just connect remotely. Here's a guide on how to do that. Source: about 2 years ago
You can get VisualVM here. Once installed, you can launch VisualVM and connect it to our running application to see the process. - Source: dev.to / about 2 years ago
How about you actually use a profiler and see what the culprit is: https://visualvm.github.io/. Source: over 2 years ago
VisualVM : A GUI Java profiling/analysis tool that can be used for Performance profiling (including per-thread analysis), Thread/Heap dumping, Monitoring. For JDK 8, this comes bundled as jvisualvm. For JDK 9, you will need to manually download it. - Source: dev.to / over 2 years ago
If you really want to know what those threads are doing, I suggest you download jvisualvm (it's no longer part of the JDK release, but it still works very well) and attach it to the process. Source: over 2 years ago
VisualVM is a JVM troubleshooting tool, it was bundled with JDK 6,7,8 and is a standalone free tool. It can help you with JMX, profiling, memory monitoring, taking and displaying thread and heap dumps and so much more. If you do not have it on your local machine, download it and learn how to use it. I will definitely improve your troubleshooting capabilities. - Source: dev.to / over 2 years ago
My suggestion to further understand how the application works would be that you use a tool such as VisualVM while jmeter is running. There you can start the cpu sampler and look for the main thread. Then you can see which methods are called on that thread. Source: almost 3 years ago
For ingame builds, you can use Spark or VisualVM (external program). Apart from that, there's not much more I can suggest. Source: about 3 years ago
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