# fast/fastrace

A tracing library 10~100x faster than others.

Repository: https://github.com/fast/fastrace
Canonical: https://ross.abutalabs.com/products/fastrace
Homepage: https://docs.rs/fastrace/
Language: Rust
License: Apache-2.0
License Family: permissive
Last push: 2026-07-31T09:34:35+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 95, release rhythm 35, longevity 55
- inputs: {"age_days": 778, "days_push": 33, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1129, forks 56 (observed 2026-08-28T04:03:42.008263+00:00)

## What it is
Fastrace is a high-performance timeline tracing library for Rust, claiming to be 10-100x faster than other tracing libraries. It supports library-level instrumentation with zero overhead when disabled and is compatible with OpenTelemetry.

## Use cases
- instrument Rust functions with spans for performance tracing
- add tracing to a Rust library with zero overhead when disabled
- collect and report span records in a Rust application
- migrate from tokio tracing to a faster alternative
- export traces via OpenTelemetry
- trace short tasks with root spans and hierarchical children

## When to avoid
- you need the broad ecosystem and integrations of the tokio tracing crate
- you need structured logging as the primary concern rather than span-based tracing
- your project is not written in Rust

## Facets
- artifact type: library
- maturity: active
- function: tracing, logging, monitoring
- domain: developer-tools, backend, performance
- platform: rust, cross-platform
- tags: opentelemetry, distributed-tracing, spans, high-performance, zero-overhead

## Member repositories
- fast/fastrace (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:42.008263+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:38:24.283146+00:00, confidence not recorded.
  - readme: https://github.com/fast/fastrace (fetched 2026-08-28T04:03:42.008263+00:00, sha 53e474ce0f94)
  - homepage: https://docs.rs/fastrace/ (fetched 2026-08-29T12:42:54.789921+00:00, sha d905da154e99)
  - site_page: https://docs.rs/about/builds (fetched 2026-08-29T12:42:54.803914+00:00, sha 811231ca4680)
  - site_page: https://docs.rs/ (fetched 2026-08-29T12:42:54.793382+00:00, sha e48238183811)
  - site_page: https://docs.rs/crate/fastrace/latest (fetched 2026-08-29T12:42:54.795558+00:00, sha a5fe677b2da2)
  - site_page: https://docs.rs/crate/fastrace/latest/features (fetched 2026-08-29T12:42:54.797928+00:00, sha 2aebd1658885)
  - site_page: https://docs.rs/about (fetched 2026-08-29T12:42:54.799951+00:00, sha 29ab7986fbf5)
  - site_page: https://docs.rs/about/badges (fetched 2026-08-29T12:42:54.802091+00:00, sha 6588cac258af)
  - site_page: https://docs.rs/about/metadata (fetched 2026-08-29T12:42:54.805600+00:00, sha 0dcdccb2b2b2)
  - site_page: https://docs.rs/about/redirections (fetched 2026-08-29T12:42:54.807352+00:00, sha 1b1efd93105f)
- Data as of 2026-08-30T08:39:29.467469+00:00.