Spot placement score
The Spot placement score feature can recommend an AWS Region or Availability Zone based on your Spot capacity requirements. Spot capacity fluctuates, and you can't be sure that you'll always get the capacity that you need. A Spot placement score indicates how likely it is that a Spot request will succeed in a Region or Availability Zone.
Note
A Spot placement score does not provide any guarantees in terms of available capacity or risk of interruption. A Spot placement score serves only as a recommendation.
Use cases
You can use the Spot placement score feature for the following:
-
To relocate and scale Spot compute capacity in a different Region, as needed, in response to increased capacity needs or decreased available capacity in the current Region.
-
To identify the most optimal Availability Zone in which to run single-Availability Zone workloads.
-
To simulate future Spot capacity needs so that you can pick an optimal Region for the expansion of your Spot-based workloads.
-
To find an optimal combination of instance types to fulfill your Spot capacity needs.
Contents
Limitations
-
Target capacity limit – Your Spot placement score target capacity limit is based on your recent Spot usage, while accounting for potential usage growth. If you have no recent Spot usage, we provide you with a low default limit aligned with your Spot request limit.
-
Request configurations limit – We can limit the number of new request configurations within a 24-hour period if we detect patterns not associated with the intended use of the Spot placement score feature. If you reach the limit, you can retry the request configurations that you've already used, but you can't specify new request configurations until the next 24-hour period.
-
Minimum number of instance types – If you specify instance types, you must specify at least three different instance types, otherwise Amazon EC2 will return a low Spot placement score. Similarly, if you specify instance attributes, they must resolve to at least three different instance types. Instance types are considered different if they have a different name. For example, m5.8xlarge, m5a.8xlarge, and m5.12xlarge are all considered different.
Costs
There is no additional charge for using the Spot placement score feature.
