4.0.0 - 2025-09-01

Release Notes

💥 BREAKING

It's now required to explicitly set the runner mode to instrumentation or walltime using either:

• the --mode CLI argument
• or the CODSPEED_RUNNER_MODE environment variable

Tip

Before, this variable was automatically set to instrumentation on every runner except for CodSpeed macro runners where it was set to walltime by default.

Details

🚀 Features

• Make perf profiling enabled by default by @GuillaumeLagrange in #110
• Make the runner mode argument required by @GuillaumeLagrange
• Use introspected node in walltime mode by @GuillaumeLagrange in #108
• Add instrumented go shell script by @not-matthias in #102

🐛 Bug Fixes

• Compute proper load bias by @not-matthias in #107
• Increase timeout for first perf ping by @GuillaumeLagrange
• Prevent running with valgrind by @not-matthias in #106

🏗️ Refactor

• Change go-runner binary name by @not-matthias in #111

⚙️ Internals

• Add AGENTS.md by @GuillaumeLagrange

Install codspeed-runner 4.0.0

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/CodSpeedHQ/runner/releases/download/v4.0.0/codspeed-runner-installer.sh | sh

Download codspeed-runner 4.0.0

File	Platform	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