Concurrency FAQ

Concurrency refers to the number of Terraform or OpenTofu runs that can execute simultaneously. This directly impacts how quickly infrastructure changes can be deployed and how efficiently your teams can work. Scalr offers a flexible approach to concurrency, especially with the introduction of self-hosted agents.

All Scalr accounts start with five concurrent runs on the Scalr.io runners. This limit can be increased free of charge by opening a support ticket with a valid use case.

However, a key aspect of Scalr's concurrency model is the ability to deploy self-hosted agents within your own infrastructure. Each of these agents provides an additional five concurrent runs, and these agent-based concurrent runs are decoupled from the Scalr.io runner limits.

From a pricing perspective, Scalr only charges based on the number of runs, not on concurrency. This is a significant advantage as it allows organizations to increase their deployment speed and developer productivity.