5.6.3 - 2026-11-03

Highlights

Go benchmark times match go test

b.Loop() benchmarks that stop and restart the timer inside an iteration now report all of their timed work. A round previously counted only the time since the most recent StartTimer, so results for those benchmarks will move.

Unsupported go test flags no longer fail the run

go test -p 1 ./... -bench . used to strip -p, parse 1 as a package, and fail with package 1 is not in std after every benchmark had passed. Flags and their values are now dropped together.

Fixed randomness in CPU Simulation

getrandom(), /dev/urandom, AT_RANDOM and hardware RNG instructions now return the same values on every CPU Simulation run, removing one source of run-to-run variance.

Release Notes

🚀 Features

• Always enable deterministic RNG (#600) by @not-matthias in #600

🐛 Bug Fixes

• Quiet expected libbpf warnings in a user namespace (#602) by @GuillaumeLagrange in #602
• Bump go-runner to 1.4.0 (#605) by @adriencaccia in #605
  • fix(cli): drop the value of unsupported go test flags by @not-matthias in CodSpeedHQ/codspeed-go#67
  • fix(go-runner): count all timed segments of a b.Loop() iteration by @not-matthias in CodSpeedHQ/codspeed-go#69

Install codspeed-runner 5.6.3

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/CodSpeedHQ/codspeed/releases/download/v5.6.3/codspeed-runner-installer.sh | sh

Download codspeed-runner 5.6.3

File	Platform	Checksum
codspeed-runner-aarch64-apple-darwin.tar.gz	Apple Silicon macOS	checksum
codspeed-runner-aarch64-unknown-linux-musl.tar.gz	ARM64 MUSL Linux	checksum
codspeed-runner-x86_64-unknown-linux-musl.tar.gz	x64 MUSL Linux	checksum