Many Amazon EC2 instances support simultaneous multithreading (SMT), which enables multiple threads to run concurrently on a single CPU core. Each thread is represented as a virtual CPU (vCPU) on the instance. An instance has a default number of CPU cores, which varies according to instance type. For example, an m5.xlarge instance type has two CPU cores and two threads per core by defaultâfour vCPUs in total.
In most cases, there is an Amazon EC2 instance type that has a combination of memory and number of vCPUs to suit your workloads. However, to optimize your instance for specific workloads or business needs, you can specify the following CPU options during and after instance launch:
Number of CPU cores: You can customize the number of CPU cores for the instance. You might do this to potentially optimize the licensing costs of your software with an instance that has sufficient amounts of RAM for memory-intensive workloads but fewer CPU cores.
Threads per core: You can disable SMT by specifying a single thread per CPU core. You might do this for certain workloads, such as high performance computing (HPC) workloads.
You can't modify the number of threads per core for T2, C7a, M7a, R7a, and Apple silicon Mac instances, and instances based on the AWS Graviton processor.
The number of instances that you can run is based on the default vCPUs for the instance types used. How we calculate the vCPUs consumed by an instance is not affected by changing its CPU options.
There is no additional or reduced charge for specifying CPU options. You're charged the same as instances that are launched with the default CPU options.
Enable EBS optimization
Rules for specifying CPU options for an Amazon EC2 instance
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