Scaling node app on Heroku using Throng

Setup

yarn install

Run

yarn start

Configuration

On Heroku

Add at menu Settings on Config Variable section, an item called WEB_MEMORY with value 64. It represents that our app use 64MB to safe work.

On Heroku-cli (Command line interface)

$ heroku labs:enable log-runtime-metrics

Matains the Heroku logs -t running on cli while update the config vars to see the result on log.

Manual stress test on command line

for ((i=1;i<=5;i++)); do   curl -v --header "Connection: keep-alive" "localhost:9000"; done

Reference

• https://devcenter.heroku.com/articles/node-concurrency
• https://github.com/hunterloftis/throng
• https://devcenter.heroku.com/articles/log-runtime-metrics