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🐦 puffin

The friendly little instrumentation profiler for Rust

Puffin photo by Richard Bartz

(puffin photo by Richard Bartz)

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How to use

fn my_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 100-200 nanoseconds.

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 1-2 ns (and some stack space);

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


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

Puffin Flamegraph using puffin_egui

If you are using the imgui crate, there is also puffin-imgui.

Remote profiling

You can use puffin_http to send profile events over TCP to puffin_viewer.


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


Contributor Covenant

We welcome community contributions to this project.

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


Licensed under either of

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.