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

Last Updated:Mar 13, 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 memory-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 r7a 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.r7a.large

2

1

2

1 and 2

ecs.r7a.xlarge

4

2

2

1 and 2

ecs.r7a.2xlarge

8

2 and 4

2

1 and 2

ecs.r7a.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r7a.8xlarge

32

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

2

1 and 2

ecs.r7a.16xlarge

64

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

2

1 and 2

ecs.r7a.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 r7 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.r7.large

2

1

2

1 and 2

ecs.r7.xlarge

4

2

2

1 and 2

ecs.r7.2xlarge

8

2 and 4

2

1 and 2

ecs.r7.3xlarge

12

2, 4, and 6

2

1 and 2

ecs.r7.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r7.6xlarge

24

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

2

1 and 2

ecs.r7.8xlarge

32

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

2

1 and 2

ecs.r7.16xlarge

64

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

2

1 and 2

ecs.r7.32xlarge

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 r7t 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.r7t.large

2

1

2

1 and 2

ecs.r7t.xlarge

4

2

2

1 and 2

ecs.r7t.2xlarge

8

2 and 4

2

1 and 2

ecs.r7t.3xlarge

12

2, 4, and 6

2

1 and 2

ecs.r7t.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r7t.6xlarge

24

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

2

1 and 2

ecs.r7t.8xlarge

32

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

2

1 and 2

ecs.r7t.16xlarge

64

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

2

1 and 2

ecs.r7t.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 re6p 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.re6p.large

2

1

2

1 and 2

ecs.re6p.xlarge

4

2

2

1 and 2

ecs.re6p.2xlarge

8

2 and 4

2

1 and 2

ecs.re6p.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.re6p.13xlarge

52

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

2

1 and 2

ecs.re6p.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

ecs.re6p-redis.large

2

1

2

1 and 2

ecs.re6p-redis.xlarge

4

2

2

1 and 2

ecs.re6p-redis.2xlarge

8

2 and 4

2

1 and 2

ecs.re6p-redis.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.re6p-redis.13xlarge

52

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

2

1 and 2

ecs.re6p-redis.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 r6a 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.r6a.large

2

1

2

1 and 2

ecs.r6a.xlarge

4

2

2

1 and 2

ecs.r6a.2xlarge

8

2 and 4

2

1 and 2

ecs.r6a.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r6a.8xlarge

32

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

2

1 and 2

ecs.r6a.16xlarge

64

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

2

1 and 2

Values related to the number of physical CPU cores and the number of threads per core of r6e 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.r6e.large

2

1

2

1 and 2

ecs.r6e.xlarge

4

2

2

1 and 2

ecs.r6e.2xlarge

8

2 and 4

2

1 and 2

ecs.r6e.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r6e.8xlarge

32

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

2

1 and 2

ecs.r6e.13xlarge

52

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

2

1 and 2

ecs.r6e.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 r6 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.r6.large

2

1

2

1 and 2

ecs.r6.xlarge

4

2

2

1 and 2

ecs.r6.2xlarge

8

2 and 4

2

1 and 2

ecs.r6.3xlarge

12

2, 4, and 6

2

1 and 2

ecs.r6.4xlarge

16

2, 4, 6, and 8

2

1 and 2

ecs.r6.6xlarge

24

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

2

1 and 2

ecs.r6.8xlarge

32

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

2

1 and 2

ecs.r6.13xlarge

52

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

2

1 and 2

ecs.r6.26xlarge

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.