AWS vCPU Explained
Understand AWS vCPU, how virtual CPUs relate to EC2 compute capacity, and how to estimate resources for development, testing, and application workloads.
What is an AWS vCPU?
A vCPU is a virtual processor presented to an EC2 instance. The exact relationship to physical CPU resources depends on the instance family and underlying hardware.
How many vCPUs do you need?
Start with the application's measured CPU demand rather than choosing the largest option. Small development environments may need only a few vCPUs, while parallel builds, data processing, and busy application servers can require more.
vCPU is only one part of sizing
Memory, storage performance, network throughput, architecture, region, and workload behavior can matter as much as CPU count.
Test before scaling
Use monitoring data and repeatable load tests. Scale when sustained utilization or latency shows that the current instance is undersized.
Frequently Asked Questions
Should I choose a cloud platform only by price?
No. Consider workload requirements, regions, reliability, managed services, security, support, team skills, and total operating cost.
Should I check provider documentation before deployment?
Yes. Cloud services, pricing, quotas, availability, and terms can change, so verify current provider documentation for decisions that depend on them.