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How to Scale a Mobile App?

Is it possible to run a low-scale dynamic app on Heroku, completely free of cost?

  • I want to deploy a rails app on Heroku. My app needs database interaction and I therefore assume would need a worker dyno. Since I need to display my pages too, I will need a web dyno too. Since my app, in initial stages at least, will utilize a very small fraction of the allocated dyno hours, I was wondering if it is possible to provision some of the web dyno hours to worker dyno hours so that the total nicely fits into 750 dyno hrs/month

  • Answer:

    A worker dyno is usually only needed for those tasks that are run as something like a delayed job or a cron job. If your app implements a simple database backed website, then a single web dyno will be sufficient. Database interactions by themselves do not require a worker dyno.

Sujoy Gupta at Quora Visit the source

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Sujoy Gupta is right, database interaction does not require any background worker, they are rather thought for long-running tasks such as requests to external apis. That said, there is a background worker library called Girl Friday [1] that runs inside your Rails instance, that is your first and only Heroku Web dyno. Combined with the Unicorn app server for instance you can thus build a web app that will still respond quickly to end users while processing background jobs at small scale requiring only the free heroku dyno. [1]: https://github.com/mperham/girl_friday

Thomas Klemm

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