wgpu-profiler

Simple profiler scopes for wgpu using timer queries

Features

• Easy to use profiler scopes
  • Allows nesting!
  • Can be disabled by runtime flag
  • Additionally generates debug markers
• Internally creates pools of timer queries automatically
  • Does not need to know in advance how many queries/profiling scopes are needed
  • Caches up profiler-frames until results are available
    • No stalling of the device at any time!
• Many profiler instances can live side by side
• chrome trace flamegraph json export

TODO:

• Better error messages
• Disable via feature flag

How to use

Create a new profiler object:

use wgpu_profiler::{wgpu_profiler, GpuProfiler};
// ...
let mut profiler = GpuProfiler::new(4, queue.get_timestamp_period(), device.features()); // buffer up to 4 frames

Using scopes is easiest with the macro:

wgpu_profiler!("name of your scope", &mut profiler, &mut encoder, &device, {
  // wgpu commands go here
});

Note that GpuProfiler reads the device features - if your wgpu device doesn't have wgpu::Features::TIMESTAMP_QUERY enabled, it will automatically not attempt to emit any timer queries. Similarly, if wgpu::Features::WRITE_TIMESTAMP_INSIDE_PASSES is not present, no queries will be issued from inside passes.

Wgpu-profiler needs to insert buffer copy commands, so when you're done with an encoder and won't do any more profiling scopes on it, you need to resolve the queries:

profiler.resolve_queries(&mut encoder);

And finally, to end a profiling frame, call end_frame. This does a few checks and will let you know of something is off!

profiler.end_frame().unwrap();

Retrieving the oldest available frame and writing it out to a chrome trace file.

if let Some(profiling_data) = profiler.process_finished_frame() {
    // You usually want to write to disk only under some condition, e.g. press of a key or button
    wgpu_profiler::chrometrace::write_chrometrace(std::path::Path::new("mytrace.json"), &profiling_data);
}

To get a look of it in action, check out the example project!

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Changelog

• 0.11.0
  • Upgrade to wgpu 0.15
• 0.10.0
  • Upgrade to wgpu 0.14 and switch to rust 2021 edition, by @Imberflur in #23
• 0.9.1
  • Better docs #21
  • Fix crash on dropped frame #20, reported by @JCapucho in #19
  • Fix enable_pass_timer/enable_encoder_timer checking wrong features