Surface::get_current_texture is really slow

[botahamec]

I made a bunnymark program last night. It seems like a lot of my performance is going to the get_next_texture function, which is ran by surface.get_current_texture. This is with Mailbox mode on a Windows 10 desktop with a GTX 1650 running on Vulkan. It starts out normal, taking only several microseconds, but over time, increases to as much as 40 milliseconds. Any ideas as to what could cause this?

[cwfitzgerald]

This is basically because you're gpu bound. When the gpu gets too far behind the cpu, the driver will start "holding the cpu back" by means of get_next_texture.

[botahamec]

Hmm. I assumed that was done on Queue::submit or SurfaceTexture::present. That certainly explains it. Thanks.