Application unresponsive under Linux without vkQueueWaitIdle call

[stephane-13]

When I run the program under Linux, the window is unresponsive and the whole screen is freezing intermittently.
Adding an extra call to vkQueueWaitIdle( presentation_queue ) at the end of the draw_frame() function solves the issue.
Is that something expected?

[realitix]

Hello,

What program are you running ?

[stephane-13]

I'm running example/example_sdl2.py.
I think my issue is due to vsync being enabled (enforced) at the driver level.
The program, without vkQueueWaitIdle calls, hammers the rendering pipeline too fast.

[realitix]

Ok @stephane-13.
Did you find a way to fix this ?

If not, I will update the test with a Wait for each loop.

[stephane-13]

Yes, as I mentioned above, I had to add a call to vkQueueWaitIdle at the end of the draw_frame() function to limit the number of frames submitted to the rendering pipeline.

I assume that when vsync is enabled, the frames are sent too quickly (i.e. faster than 60Hz in my case) and the vkQueueWaitIdle call ensures that the previous frame has been processed before sending the next one.

[realitix]

I fixed it.
When I add the wait, I move from 6000FPS to 5000FPS but for this test it's not a problem.