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    Elastic Compute Service:CPU options of instance types in instance families with local SSDs

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    Elastic Compute Service:CPU options of instance types in instance families with local SSDs

    Last Updated:Mar 25, 2024

    When you call the RunInstances operation to create Elastic Compute Service (ECS) instances, you can specify CPU options for specific instance types. The CPU options of an ECS instance include the number of physical CPU cores and the number of threads per core. You can adjust the number of vCPUs allocated to an ECS instance by changing the number of physical CPU cores and the number of threads per core of the ECS instance based on your application performance requirements. This way, you can gain better performance and control costs. This topic lists the values related to the number of physical CPU cores and the number of threads per core of each instance type in instance families with local SSDs. You can use these values when you specify CPU options.

    Values related to the number of physical CPU cores and the number of threads per core of i3g instance types

    Instance type

    Default value for the number of vCPUs

    Valid values for the number of physical CPU cores

    Default value for the number of threads per core

    Valid values for the number of threads per core

    ecs.i3g.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.i3g.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.i3g.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.i3g.13xlarge

    52

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26

    2

    1 and 2

    ecs.i3g.26xlarge

    104

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, and 52

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of i3 instance types

    Instance type

    Default value for the number of vCPUs

    Valid values for the number of physical CPU cores

    Default value for the number of threads per core

    Valid values for the number of threads per core

    ecs.i3.xlarge

    4

    2

    2

    1 and 2

    ecs.i3.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.i3.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.i3.8xlarge

    32

    2, 4, 6, 8, 10, 12, 14, and 16

    2

    1 and 2

    ecs.i3.13xlarge

    52

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and 26

    2

    1 and 2

    ecs.i3.26xlarge

    104

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, and 52

    2

    1 and 2

    References

    • After you obtain the valid values for the number of physical CPU cores and the number of threads per core of an instance type, you can change the CPU options of the instance type based on your business requirements. For more information, see the Specify CPU options section in the "Specify and view CPU options" topic.

    • Hyper-threading (HT) enables two threads to concurrently run on a single physical CPU core as vCPUs. To create an ECS instance that uses only physical CPU cores, you need to only disable HT for the instance. For more information, see the Number of threads per core section in the "Specify and view CPU options" topic.