Amazon EC2 provides 5 different instance types and publishes compute capacity as EC2 Compute Unit. But what do they really mean as actual cpu’s reported to the operating system?

Its quite easy to find out. /proc/cpuinfo provides  information about CPU and their speed. In the table below I have attached the output of more /proc/cpuinfo for each instance type and the actual proc report on cpuinfo so you can see how tthe OS treats them from a physical CPU standpoint.

Instance type Amazon compute units and physical cpu cpuinfo
Small Instance 1 EC2 Compute Unit (1 virtual core with 1 EC2 Compute Unit) 1 physical core @2.6 GHz small cpuinfo
Large Instance 4 EC2 Compute Units (2 virtual cores with 2 EC2 Compute Units each) 2 physical cores @ 2.0 GHz large cpuinfo
Extra Large Instance 8 EC2 Compute Units (4 virtual cores with 2 EC2 Compute Units each) 4 phyiscal cores @ 2.6 GHz extra-large cpuinfo
High-CPU Medium Instance 5 EC2 Compute Units (2 virtual cores with 2.5 EC2 Compute Units each) 2 physical cores @ 2.4GHz high-cpu-medium cpuinfo
High-CPU Extra Large Instance 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each) 8 physical cores @ 2.4 GHz high-cpu-extra-large cpuinfo
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