Concurrency Limits

If you are currently on a container-based plan for CircleCI your jobs may queue if there are not enough containers in your plan to accommodate the current workload.

Job queueing can also occur on Performance, Custom Performance, and Scale plans if there are enough builds triggered at the same time that require containers beyond the limit of concurrency allotted to your respective plan.

For Free and Performance plans, please check out our pricing page for the details of concurrency limits that apply to your account.

For Custom Performance and Scale plans, please contact your Account Team.

Understanding container usage

As a simple example, if you have a total of 30 concurrency available on your account plan, you could:

• Run 30 single-container jobs at the same time
• Run a single job with 30x parallelism
• Run a Workflow with 30 parallel jobs
• Any combination of the above that does not exceed 30 containers at once.

Additional Resources

• Concurrency