cpu

The number of cpu units used by the task. If you use the EC2 launch type, this field is optional. Any value can be used. If you use the Fargate launch type, this field is required. You must use one of the following values. The value that you choose determines your range of valid values for the memory parameter.

If you're using the EC2 launch type or the external launch type, this field is optional. Supported values are between 128 CPU units (0.125 vCPUs) and 196608 CPU units (192 vCPUs).

This field is required for Fargate. For information about the valid values, see Task size in the Amazon Elastic Container Service Developer Guide.