examples/triangle.rs running as fast as 3378 fps, locks up PC

[SongWithoutWords]

• Version of vulkano: 0.12.0
• OS: Linux, Ubuntu 18.10
• GPU (the selected PhysicalDevice): GTX 1050
• GPU Driver: Nvidia 390.116
• Upload of a reasonably minimal complete main.rs file that demonstrates the issue: vulkano/examples/src/bin/triangle.rs
• Device: Laptop (Dell XPS 15 9570)

I launched the triangle.rs example and it locked up my machine.

I then googled around for this issue, and followed the advice in #923 by calling wait on the future after signal_fence_and_flush(), but the issue remained.

I then added some timing code to it and found that it was running as fast as 3378 fps.

Can this library be made to work with Nvidia drivers on Linux?

[SongWithoutWords]

I just tried to repro this on another machine, a desktop rather than a laptop using a GTX 1070 instead of a GTX 1050, but with the same versions of the same drivers and operating system.

Without the call to wait() after signal_fence_and_flush(), it monopolized one core of the CPU (utilizing 25%) without locking up the whole machine. After calling wait() after signal_fence_and_flush(), it now uses 1-2% of the CPU time.

So this issue seems hardware dependent.

[faulesocke]

This sounds definitely like a bug in the Nvidia driver. At least with the wait call you should never get a lockup and of course you shouldn't without the wait. Maybe point Nvidia towards this issue?

[AustinJ235]

This is a known issue, please refer to #1247