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    Elastic Compute Service:CPU options of instance types in compute-optimized instance families

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    Elastic Compute Service:CPU options of instance types in compute-optimized instance families

    Last Updated:Nov 06, 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 compute-optimized instance families. 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 c8i 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.c8i.large

    2

    1

    2

    1 and 2

    ecs.c8i.xlarge

    4

    2

    2

    1 and 2

    ecs.c8i.2xlarge

    8

    4

    2

    1 and 2

    ecs.c8i.3xlarge

    12

    6

    2

    1 and 2

    ecs.c8i.4xlarge

    16

    8

    2

    1 and 2

    ecs.c8i.6xlarge

    24

    12

    2

    1 and 2

    ecs.c8i.8xlarge

    32

    16

    2

    1 and 2

    ecs.c8i.12xlarge

    48

    24

    2

    1 and 2

    ecs.c8i.16xlarge

    64

    32

    2

    1 and 2

    ecs.c8i.24xlarge

    96

    48

    2

    1 and 2

    ecs.c8i.48xlarge

    192

    96

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of c7a 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.c7a.large

    2

    1

    2

    1 and 2

    ecs.c7a.xlarge

    4

    2

    2

    1 and 2

    ecs.c7a.2xlarge

    8

    4

    2

    1 and 2

    ecs.c7a.4xlarge

    16

    8

    2

    1 and 2

    ecs.c7a.8xlarge

    32

    16

    2

    1 and 2

    ecs.c7a.16xlarge

    64

    32

    2

    1 and 2

    ecs.c7a.32xlarge

    128

    64

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of c7 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.c7.large

    2

    1

    2

    1 and 2

    ecs.c7.xlarge

    4

    2

    2

    1 and 2

    ecs.c7.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c7.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c7.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c7.6xlarge

    24

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

    2

    1 and 2

    ecs.c7.8xlarge

    32

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

    2

    1 and 2

    ecs.c7.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c7.32xlarge

    128

    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, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of c7t 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.c7t.large

    2

    1

    2

    1 and 2

    ecs.c7t.xlarge

    4

    2

    2

    1 and 2

    ecs.c7t.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c7t.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c7t.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c7t.6xlarge

    24

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

    2

    1 and 2

    ecs.c7t.8xlarge

    32

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

    2

    1 and 2

    ecs.c7t.16xlarge

    64

    2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32

    2

    1 and 2

    ecs.c7t.32xlarge

    128

    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, 52, 54, 56, 58, 60, 62, and 64

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of c6t 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.c6t.large

    2

    1

    2

    1 and 2

    ecs.c6t.xlarge

    4

    2

    2

    1 and 2

    ecs.c6t.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c6t.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c6t.8xlarge

    32

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

    2

    1 and 2

    ecs.c6t.13xlarge

    52

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

    2

    1 and 2

    ecs.c6t.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 c6a 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.c6a.large

    2

    1

    2

    1 and 2

    ecs.c6a.xlarge

    4

    2

    2

    1 and 2

    ecs.c6a.2xlarge

    8

    4

    2

    1 and 2

    ecs.c6a.4xlarge

    16

    8

    2

    1 and 2

    ecs.c6a.8xlarge

    32

    16

    2

    1 and 2

    ecs.c6a.16xlarge

    64

    32

    2

    1 and 2

    ecs.c6a.32xlarge

    128

    64

    2

    1 and 2

    Values related to the number of physical CPU cores and the number of threads per core of c6e 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.c6e.large

    2

    1

    2

    1 and 2

    ecs.c6e.xlarge

    4

    2

    2

    1 and 2

    ecs.c6e.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c6e.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c6e.8xlarge

    32

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

    2

    1 and 2

    ecs.c6e.13xlarge

    52

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

    2

    1 and 2

    ecs.c6e.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 c6 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.c6.large

    2

    1

    2

    1 and 2

    ecs.c6.xlarge

    4

    2

    2

    1 and 2

    ecs.c6.2xlarge

    8

    2 and 4

    2

    1 and 2

    ecs.c6.3xlarge

    12

    2, 4, and 6

    2

    1 and 2

    ecs.c6.4xlarge

    16

    2, 4, 6, and 8

    2

    1 and 2

    ecs.c6.6xlarge

    24

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

    2

    1 and 2

    ecs.c6.8xlarge

    32

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

    2

    1 and 2

    ecs.c6.13xlarge

    52

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

    2

    1 and 2

    ecs.c6.26xlarge

    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.