Profiling rust

Alexandru Ene

About me

What to expect

• Intro about profilers
• What is hawktracer?
• What is hawktracer_rust?
• How it works?
• LiveDemo (what can go wrong?)
• Questions

Profiler Types

• Sampling profilers
• Intrusive profilers

Sampling Profilers

• Easy to use
• I have tried CodeXL, VerySleepy (Windows)
• Any similar linux tool will work (perf, etc.)

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Sample output

Intrusive profilers

• User defines what’s traced.
• Accurate data. Nanoseconds not % of samples.
• Useful to detect spikes of activity.

What is HawkTracer?

• Intrusive profiler library made by Marcin Kolny.
• It open-source - MIT licence https://github.com/amzn/hawktracer/
• Targets low-end platforms (think single core < 1GHZ) so it has minimal overhead.
• Can stream profiling data over network
• Outputs available: chrome-tracing, callgrind, flamegraphs generation, more to come (hawktracer-converter)

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What is HawkTracer?

Profiling Low-End Platforms using HawkTracer Profiler Marcin Kolny

Track: Free Tools and Editors devroom

Room: UD2.119

Day: Sunday 16:30 - 17:00

rust_hawktracer

• Rust API for the HawkTracer profiler.

It has the following goals (in order of priority).

• Low-overhead
• Easy to use
• Hard to make mistakes

Profiling data pipeline

Your rust program

rust_hawktracer

hawtracer-converter

Profiling Data (Binary)

Chrome-tracing

(JSON)

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Flamegraph

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Callgrind format

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Other formats on the way

Live coding demo time!

What's next?

• Lower overhead tracepoints.
• Stabilize API - Almost done.
• Better tool support:
• No need to download an extra executable? (hawktracer-converter).
• Probably can hide it behind a config flag like (features=”generate-converter”)
• The new hawktracer-converter is also a Rust project !!!

Thank you

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Twitter: @_AlexEne_

Github: https://github.com/AlexEne

Rust_hawktracer: https://crates.io/crates/rust_hawktracer

Twitch: twitch.tv/nomad_pixel

Questions?