Dyno Types

Last updated 11 May 2018

Heroku offers many different dyno types. Each type offers different features and functionality. Their memory and CPU characteristics are listed in the table below.

Overall, performance can vary significantly based on your app’s implementation. These figures show expected performance based on 99 percent of historical system loads. Apps running free, hobby and standard dyno types will have a performance that varies based on available system resources.

Both standard and performance dyno types support professional features like horizontal scalability, application metrics, and preboot. performance dynos also provide autoscaling for web dynos and dedicated resources.

For information about pricing, see Usage & Billing.

Mixing dyno types

An application using a free dyno type can only use the free dyno type for the web and worker dynos. It can’t be mixed with other dyno types.

An application using a hobby dyno type can only use the hobby dyno type for the web and worker dynos. It can’t be mixed with other dyno types.

An application using standard and performance dyno types can mix those dyno types. For example, it can run the web process type using the performance-m dyno type, and a worker on standard-1x.

Dyno sleeping

Only free dynos will sleep. For more information, see Free Dyno Hours.

Default scaling limits

The free and hobby dyno types only support a maximum of one dyno running per process type. Additionally, applications using a free dyno type are limited to a maximum of two concurrent running dynos.

By default, all applications are limited to 100 dynos. Additionally, a process type can’t be scaled to more than 10 dynos for performance dynos.

Submit a request to raise this limit for your application.

Concurrent one-off dyno limits

There are different limits that apply depending on whether the Heroku account is verified or not.

If the account is not verified, then it cannot have more than 3 one-off dynos of type free or hobby running concurrently. Accounts that aren’t verified can’t create one-off standard or one-off performance dynos.

For verified accounts, no more than 5 one-off dynos of each performance dyno size can run concurrently (e.g., 5 performance-m and 5 performance-l).

Standard-1x and standard-2x have a limit of 50 concurrent one-off dynos.

Submit a request to raise this limit for your application.

Setting dyno type

Choosing a new dyno type will restart all of the affected dynos.

CLI

Using the Heroku CLI, you can resize or scale. The following command scales the number of web dynos to 3:

$ heroku dyno:type web=3

To just resize (in this case, to standard-2x):

$ heroku dyno:type worker=standard-2x

To resize all process types in the application:

$ heroku dyno:type standard-1x

If you’re resizing to a larger size, you may want to scale down the number of dynos as well. See Optimizing Dyno Usage for guidance.

To view the dyno size of a process type, use the ps command:

$ heroku ps
=== web (standard-2x): `bundle exec puma -C config/puma.rb`
web.1: up 2015/03/27 14:27:58 (~ 6h ago)
web.2: up 2015/03/27 14:47:04 (~ 6h ago)
web.3: up 2015/03/27 15:08:23 (~ 5h ago)

=== worker (standard-1x): `bundle exec rake worker:job`
worker.1: up 2015/03/27 14:39:04 (~ 6h ago)
worker.2: up 2015/03/27 15:08:24 (~ 5h ago)
worker.3: up 2015/03/27 14:30:55 (~ 6h ago)

Dashboard

Alternatively, you can use the app’s Resources page on Dashboard to change the dyno types.

1. Select the app you want to scale from your apps list.
2. Navigate to the Resources tab.
3. Above your list of dynos, click the Change… button.
4. Select the dyno size you would like to switch to (Free, Hobby, or Professional/Performance).
5. Click Save.

To further resize Professional/Performance dynos (continued from above):

1. Make sure the app size is set to Professional or Performance dynos.
2. Click the hexagon shape next to the process type you want to resize.
3. Choose an option from the drop-down menu (Standard-1X, Standard-2X, Performance-M or Performance-L).
4. Click Confirm.

Professional and Performance dyno types can also be scaled from the Dashboard.

One-off dynos

Memory intensive one-off dynos may also be sized. To learn more, see One-Off Dynos.

Scheduler

Scheduler supports all the new dyno types.