Winit example slow on wsl

[yashs662]

The example only gets around 4-5 FPS on WSL but gets around 1K+ on Windows, any way I can fix this?

[simbleau]

My first guess is that GPU passthrough either isn't available (CPU fall-back?) or is throttled.

Please be more specific and explain how you're running it, though.

[yashs662]

I thought the same! For some reason it worked before yesterday, I restarted my PC today and got this. I suspect something is wrong with my wsl instance (not sure - I haven't made any changes since yesterday). For context other tasks requiring the GPU to work are fine e.g. running machine learning models with PyTorch, nvidia-smi output is fine, nvcc is there

➜  vello git:(main) cargo run -p with_winit --release
    Finished release [optimized] target(s) in 0.78s
     Running `target/release/with_winit_bin`
No test files have been downloaded. Consider downloading some using the subcommand:
Download SVG files for testing. By default, downloads a set of files from wikipedia

Usage: cargo run -p with_winit -- download [OPTIONS] [DOWNLOADS]...

Arguments:
  [DOWNLOADS]...  Set of files to download. Use `name@url` format to specify a file prefix

Options:
      --directory <DIRECTORY>    Directory to download the files into [default: /home/yash/programming/vello/examples/assets/downloads]
      --auto                     Whether to automatically install the default set of files
      --size-limit <SIZE_LIMIT>  The size limit for each individual file (ignored if the default files are downloaded) [default: "10 MB"]
  -h, --help                     Print help
[2024-05-01T02:22:01.851Z ERROR sctk_adwaita::config] XDG Settings Portal did not return response in time: timeout: 100ms, key: color-scheme
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
Initialising in parallel using 10 threads
Parsed svg Ghostscript_Tiger in 1.880476ms
Encoded svg Ghostscript_Tiger in 80.569µs
Io error: Broken pipe (os error 32)
Io error: Broken pipe (os error 32)
thread 'main' panicked at examples/with_winit/src/lib.rs:638:10:
run to completion: ExitFailure(1)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Do you have any idea what could have changed?

[simbleau]

No idea! I also don't use Linux.

Maybe @armansito or @DJMcNab would. Looks like, although perhaps unrelated, some strange parsing of the shaders.

Particularly standing out:

XDG Settings Portal did not return response in time: timeout: 100ms, key: color-scheme
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
Initialising in parallel using 10 threads

[armansito]

No idea! I also don't use Linux.

Maybe @armansito or @DJMcNab would. Looks like, although perhaps unrelated, some strange parsing of the shaders.

Particularly standing out:

XDG Settings Portal did not return response in time: timeout: 100ms, key: color-scheme
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
#endif directives don't take an argument. `// msaa` will not be in output (line 717)
#endif directives don't take an argument. `// full` will not be in output (line 1085)
Initialising in parallel using 10 threads

Those messages (about the #endif directives) are harmless; the WGSL preprocessor doesn't gracefully handle inline comments that follow an #endif directive and print out this error message. I'll send a PR to suppress those so they don't spam the logs.