#profile #timestamp #thread #system-time

fxprof-processed-profile

Create profiles in the Firefox Profiler's processed profile JSON format

9 releases (breaking)

0.8.1 Mar 7, 2025
0.7.0 Apr 15, 2024
0.6.0 Apr 22, 2023
0.5.0 Jan 6, 2023
0.4.0 May 23, 2022

#110 in Database interfaces

Download history 44495/week @ 2025-02-01 44413/week @ 2025-02-08 45443/week @ 2025-02-15 47674/week @ 2025-02-22 56035/week @ 2025-03-01 49728/week @ 2025-03-08 55167/week @ 2025-03-15 41120/week @ 2025-03-22 50314/week @ 2025-03-29 47808/week @ 2025-04-05 44542/week @ 2025-04-12 45214/week @ 2025-04-19 34889/week @ 2025-04-26 35411/week @ 2025-05-03 31940/week @ 2025-05-10 37078/week @ 2025-05-17

144,595 downloads per month
Used in 68 crates (4 directly)

MIT/Apache

180KB
3K SLoC

fxprof-processed-profile

This crate allows you to create a profile that can be loaded into the Firefox Profiler.

Specifically, this uses the "Processed profile format".

Use Profile::new to create a new Profile object. Then add all the information into it. To convert it to JSON, use serde_json, for example serde_json::to_writer or serde_json::to_string.

Example

use fxprof_processed_profile::{Profile, CategoryHandle, CpuDelta, Frame, FrameInfo, FrameFlags, SamplingInterval, Timestamp};
use std::time::SystemTime;

let mut profile = Profile::new("My app", SystemTime::now().into(), SamplingInterval::from_millis(1));
let process = profile.add_process("App process", 54132, Timestamp::from_millis_since_reference(0.0));
let thread = profile.add_thread(process, 54132000, Timestamp::from_millis_since_reference(0.0), true);
profile.set_thread_name(thread, "Main thread");
let stack_frames = vec![
    FrameInfo { frame: Frame::Label(profile.intern_string("Root node")), category_pair: CategoryHandle::OTHER.into(), flags: FrameFlags::empty() },
    FrameInfo { frame: Frame::Label(profile.intern_string("First callee")), category_pair: CategoryHandle::OTHER.into(), flags: FrameFlags::empty() }
];
let stack = profile.intern_stack_frames(thread, stack_frames.into_iter());
profile.add_sample(thread, Timestamp::from_millis_since_reference(0.0), stack, CpuDelta::ZERO, 1);

let writer = std::io::BufWriter::new(output_file);
serde_json::to_writer(writer, &profile)?;

Dependencies

~1–1.8MB
~38K SLoC