Performance measurement, storage, and analysis.

Clone this repo:


  1. 84e58bf all: gofmt by Russ Cox · 3 months ago master
  2. b570d1a benchseries: expand configuration for performance monitoring by Michael Pratt · 3 months ago
  3. 144f186 benchseries: group by .fullname rather than .name by Michael Pratt · 3 months ago
  4. db86f40 benchseries: drop unused argument to AddSummaries by Michael Pratt · 3 months ago
  5. 0625e00 update for new packages and tools by Austin Clements · 8 months ago

Go benchmark analysis tools

Go Reference

This subrepository holds tools and packages for analyzing Go benchmark results, such as the output of testing package benchmarks.


This subrepository contains command-line tools for analyzing benchmark result data.

cmd/benchstat computes statistical summaries and A/B comparisons of Go benchmarks.

cmd/benchsave publishes benchmark results to

To install all of these commands, run go install You can also git clone and run go install ./cmd/... in the checkout.


Underlying the above tools are several packages for working with benchmark data. These are designed to work together, but can also be used independently.

benchfmt reads and writes the Go benchmark format.

benchunit manipulates benchmark units and formats numbers in those units.

benchproc provides tools for filtering, grouping, and sorting benchmark results.

benchmath provides tools for computing statistics over distributions of benchmark measurements.

Deprecated packages

The following packages are deprecated and no longer supported:

storage contains a deprecated version of the benchmark result storage system. These packages have moved to

analysis contains a deprecated version of the benchmark result analysis system. These packages have moved to

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see

The main issue tracker for the perf repository is located at Prefix your issue with “x/perf:” in the subject line, so it is easy to find.