fn my_function() {
    puffin::profile_function!();
    ...
    if ... {
        puffin::profile_scope!("load_image", image_name);
        ...
    }
}

The Puffin macros write data to a thread-local data stream. When the outermost scope of a thread is closed, the data stream is sent to a global profiler collector. The scopes are pretty light-weight, costing around 50-200 ns.

You have to turn on the profiler before it captures any data with a call to puffin::set_scopes_on(true);. When the profiler is off the profiler scope macros only has an overhead of 1 ns on an M1 MacBook Pro (plus some stack space).

Once per frame you need to call puffin::GlobalProfiler::lock().new_frame();.

You can use puffin_http to send profile events over TCP to puffin_viewer. This is as easy as:

fn main() {
    let server_addr = format!("127.0.0.1:{}", puffin_http::DEFAULT_PORT);
    let _puffin_server = puffin_http::Server::new(&server_addr).unwrap();
    eprintln!("Run this to view profiling data:  puffin_viewer {server_addr}");
    puffin::set_scopes_on(true);
    …
    // You also need to periodically call
    // `puffin::GlobalProfiler::lock().new_frame();`
    // to flush the profiling events.
}

To view the profile data in-game you can use puffin_egui.

If you are using eframe you can look at this example.

Also check out the crate profiling which provides a unifying layer of abstraction on top of puffin and other profiling crates.

We welcome community contributions to this project.

Please read our Contributor Guide for more information on how to get started.

We use the cargo release tool to manage changelogs, git tags and publishing crates.

Each substantial pull request should add a changelog entry under the [Unreleased] section (see keep a changelog and previous changelog entries). The crate version in Cargo.toml is never updated manually in a PR as it's handled by cargo release.

Licensed under either of

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

at your option.

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.