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Last pushed: a year ago
Short Description docker images.
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Chat on in the #jsperf channel.

How to run a local copy of jsPerf for testing/debugging


  1. Clone the repository: git clone
  2. Use the version of node for this project defined in .nvmrc: nvm install (More on nvm)
  3. Install dependencies: npm install
  4. Get a API key by signing in and going to the settings page. (You'll need this in the last step)
  5. Register a new OAuth GitHub development application by going to your settings page in github. Take note to copy the "Client ID" and "Client Secret". The callback URL is simply the root url of the application, e.g., http://localhost:3000
  6. Setup environment configuration: node setup

Running the server


jsPerf is available at localhost and changes to the codebase can be applied by running docker-compose build web.

One-time Setup

_$MYSQL_PASSWORD is whatever you chose or generated during node setup_

  1. Install Docker Toolbox so you have docker and docker-compose
  2. Create a Data Volume Container to persist data: docker create -v /var/lib/mysql --name data-jsperf-mysql mysql /bin/true
  3. Start Docker Compose in detached mode: MYSQL_PASSWORD=$MYSQL_PASSWORD docker-compose up
  4. Setup database tables with: MYSQL_PASSWORD=$MYSQL_PASSWORD docker-compose run web node /code/setup/tables
  5. Verify everything is working: open http://$(docker-machine ip)

docker-compose.yml orchestrates a load balancer (nginx), the app (this node project), and a database (mysql) with some additional services to help with continuous deployment. To start everything up, run: MYSQL_PASSWORD=$MYSQL_PASSWORD docker-compose up. Pressing ctrl+c or sending a similar interruption will stop all of the containers. To run the composed containers in the background, use the -d argument.

You can start additional app containers by running docker-compose scale web=3 where 3 is the total number of containers. The load balancer will automatically reconfigure itself to include the new containers. Similarly, you can scale down the containers by running docker-compose scale web=1 and the load balancer will, again, reconfigure itself accordingly.

Once you've built the images with docker-compose, you can manually run additional containers similar to how docker-compose scale would.

docker run -d --name jsperfcom_web_man \
--link jsperfcom_db_1:db \
--env-file .env \
--env SERVICE_3000_CHECK_HTTP=/health \

Running jsPerf locally

It is also possible to run jsPerf locally without installing and using Docker.


You’ll need Node.js and MySQL installed.

Start the MySQL server, create a database, a user, and create the database-tables using the tables.js file. Replace with your own credentials.

DB_ENV_MYSQL_PASSWORD=password DB_ENV_MYSQL_DATABASE=jsperf DB_ENV_MYSQL_USER=jsperf node setup/tables.js

Add an entry to the hosts file to redirect jsPerf’s database connections to localhost (which is where MySQL is likely running) with the following: db
Running jsPerf

Building the client

npm run build


We use lab as our test utility and code as our assertion library. Lab lints with eslint using the semistandard style. 100% code coverage by unit tests is required. To run the test suite:

# everything
npm test

# directory
npm test -- test/unit/server/web

# file
npm test -- test/unit/server/web/contributors/index.js

If you'd just like to lint and save a little time, you can run npm run lint which skips the tests.

If you're missing code coverage, open coverage.html in the root of the project for a detailed visual report.

End to End

End to end (e2e) testing is done with Selenium. There is a separate Docker Compose file to define the Selenium Grid Hub, Selenium Nodes, and the test runner. Running the e2e test suite is a three step process:

  1. Build containers: docker-compose -f docker-compose.yml -f docker-compose.e2e.yml build
  2. Start the app along with Selenium: MYSQL_PASSWORD=$MYSQL_PASSWORD docker-compose -f docker-compose.yml -f docker-compose.e2e.yml up -d
    • To scale up available Selenium Nodes to make testing faster, run: docker-compose -f docker-compose.yml -f docker-compose.e2e.yml scale firefox=5 (5 is the number of VMs Sauce Labs gives open source projects)
  3. Run the test suite: docker-compose -f docker-compose.yml -f docker-compose.e2e.yml run --rm runner npm run test-e2e

When you're done, you can safely stop and remove all of the containers by running:

docker-compose -f docker-compose.yml -f docker-compose.e2e.yml down


  • ES6 Template Strings are not supported by esprima which means you can't generate coverage reports which means npm test won't pass.

Adding new dependencies

  1. Install using npm and either --save or --save-dev. Do not edit package.json manually.
  2. Run npm shrinkwrap --dev to update npm-shrinkwrap.json

If you get an error while shrinkwrapping, try pruning your node_modules directory by running npm prune. If that doesn't work, try removing what you have installed currently, reinstalling based on package.json instead of npm-shrinkwrap.json, and then shrinkwrap again.

rm -r node_modules/ && npm install --no-shrinkwrap && npm shrinkwrap --dev


Greenkeeper is working on updating npm-shrinkwrap.json. In the meantime, here is how @maxbeatty has been shrinkwrapping the updates:

  1. Get remote branch git pull origin
  2. Checkout branch locally git co greenkeeper-<package>-0.0.0
  3. Install updated dependency defined in package.json instead of npm-shrinkwrap.json npm i --no-shrinkwrap
  4. Remove anything you no longer need npm prune
  5. Shrinkwrap the updated dependency npm shrinkwrap --dev
  6. Commit git commit -am 'shrinkwrap updated dependency'
  7. Push so updated dependency is tested and Pull Request can be merged git push origin greenkeeper-<package>-0.0.0


If you'd like extra debugging information when running the server, run with the DEBUG environment variable set to * for everything including dependencies or jsperf* for only this project's debugging statements.

DEBUG=jsperf* npm start

To add more debugging, require the debug module and namespace according to the path to the file. For example, if you want to add debugging information in server/web/errors, the debug name would be jsperf:web:errors. This allows you to finely tune which debug statements you turn on.

To only turn on web debug statements and not services:

DEBUG=jsperf:web* npm start
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