electron/docs/development/goma.md

Goma

Goma is a distributed compiler service for open-source projects such as Chromium and Android.

Electron has a deployment of a custom Goma Backend that we make available to all Electron Maintainers. See the Access section below for details on authentication.

Enabling Goma

Currently Electron Goma supports Windows, Linux, and macOS. If you are on a supported platform you can enable goma by importing the goma.gn config file when using gn.

gn gen out/Testing --args="import(\"//electron/build/args/testing.gn\") import(\"//electron/build/args/goma.gn\")"

You must ensure that you do not have cc_wrapper configured, this means you can't use sccache or similar technology.

Before you can use goma to build Electron you need to authenticate against the Goma service. You only need to do this once per-machine.

cd electron/external_binaries/goma
goma_auth.py login

Once authenticated you need to make sure the goma daemon is running on your machine.

cd electron/external_binaries/goma
goma_ctl.py ensure_start

Building with Goma

When you are using Goma you can run ninja with a substantially higher j value than would normally be supported by your machine.

Please do not set a value higher than 300 on Windows or Linux and 80 on macOS, we monitor the goma system and users found to be abusing it with unreasonable concurrency will be de-activated.

ninja -C out/Testing electron -j 200

Monitoring Goma

If you access http://localhost:8088 on your local machine you can monitor compile jobs as they flow through the goma system.

Access

For security and cost reasons access to Electron Goma is currently restricted to Electron Maintainers. If you want access please head to #access-requests in Slack and ping @goma-squad to ask for access. Please be aware that being a maintainer does not automatically grant access and access is determined on a case by case basis.