Performance?

[MrScautHD]

Hello, i really would love to use Jitter Physics but the performance is very bad... why is that so?

[MrScautHD]

22 FPS and i have the latest ryzon processor...

[notgiven688]

Are you using the debug build? Use dotnet run -c Release to start in release build. This scene runs with 600 fps on my workstation from 2014.

[MrScautHD]

i see the release thing improves it but the performance is still very bad.

[MrScautHD]

it goves not even higher then 100 FPS

[notgiven688]

Multithreading activated?

edit: The checkbox "Multithreading"; which seems to be enabled in your screenshot.

[MrScautHD]

[MrScautHD]

[notgiven688]

Even single threaded I get ~100fps

Intel(R) Xeon(R) CPU E5-4650L 0 @ 2.60GHz; Linux

---

~200fps single-threaded on my notebook i7-1165G7; Windows

[MrScautHD]

[MrScautHD]

Can you trigger it?

[MrScautHD]

Btw if you move them to fast with the mouse it crash:

[notgiven688]

Looks like a different problem?

[MrScautHD]

yep

[notgiven688]

Limited the maximum pressure force in the demo scene:
#102

This should make the simulation more stable. However, please be aware that manipulating the sphere by grabbing and moving it at high velocities may still result in instability in the soft body simulation. In such cases, increasing the number of solver iterations is necessary.

[MrScautHD]

[notgiven688]

AMD 5800 x3 results for the pyramid scene (edit: scene "Ancient Pyramids") are in:

244 fps single-threaded; 1401 fps multi-threaded

Something is odd.

[notgiven688]

There is a frame rate counter for the physics system in your screenshot (below the histogram): 40 fps. Since the physics system is running quite slow on your system you only get 33 fps in total (graphics + physics, yellow number).

[MrScautHD]

ah ok, so do you know what the issue is?

[notgiven688]

I do not know what the issue is. You can try to manually set a thread-count (please use the "Ancient Pyramids" scene for comparison):

ThreadPool.Instance.ChangeThreadCount(4);

For example in the Playground.cs constructor:

    public Playground()
    {
        world = new World(64_000, 64_000, 32_000);
        world.NullBody.Tag = new RigidBodyTag(true);
        drawBox = DrawBox;

        ThreadPool.Instance.ChangeThreadCount(4);
    }

Maybe Jitter spawns too many threads for your processor. But since the single-threading performance is already bad I doubt that this fixes anything.

[MrScautHD]

Improves the FPS, but is still very bad

[MrScautHD]

With Multithreading enabled the performance get worst.

[MrScautHD]

So it looks like something is wrong with Multithreading. but i wanna use this lib it looks very well for me!

[notgiven688]

Sorry for the late reply. Can you just report me the single-threaded performance of the "Demo 03 - Ancient pyramids" scene in release mode:

It should be well above 100 fps for your CPU. If this is the case we have indeed a problem with multithreading.

[MrScautHD]

Its about 300 FPS

[MrScautHD]

Your Raylib Test Demo just with 8000 Cubes

Without Multi Threading

With Multi Threading

[notgiven688]

Okay, it looks like you are right. Let us focus on a single scene (Ancient pyramids). >200 fps single threaded is a good performance; however it looks like it does not scale well when you are using multithreading; > 1000 fps is expected for this scene. I will read into the particularities of your CPU.

[MrScautHD]

Btw is there a discord server for this project?

[notgiven688]

I created one and linked it on the main page.