Compute Benchmark Stalls due to Unresolving Future on Windows/Vulkan

[cwfitzgerald]

Description

The benchmark below will eventually stall due to a future that never properly resolves. This occurs on windows/vulkan and both intel and nvidia, but not linux/intel nor DX12/either.

Repro steps

Repo: https://github.com/cwfitzgerald/wgpu-heterogeneous-compute-benchmark/

Issue commit: 09ce658cd8e968d44efd511ff575ff6344d56b1b (branch wgpu-bug-677)

cargo bench -- 'gpu'

Should work out of the box. This will eventually stall. The time estimates given by criterion are fairly accurate, so if it's taking much longer than it's said, it is stalled. You can also add prints in the core benchmark loop here which will eventually stop printing.

You can add a excessively long sleep in the bench loop (100-1000ms) and the problem might go away.

Platform

wgpu-rs master
Win10 18362.836