e G U I D E
Burstable CPU Performance feature of T2, T3, T3a, and T4g (Source. https://aws.amazon.com/)
This instance type suits general-purpose applications, such as microservices, small and medium-sized databases,
interactive applications with low-latency, development, virtual desktops, stage environments, build, product
prototypes, and code repositories.
AWS offers a neat feature known as "unlimited" which means that there is no limit to your CPU usage, however you are
charged for it in the form of surplus credits. This helps if you have an important CPU-intensive workload that is
unpredictable in nature. Remember that T3a and T4g are configured as "unlimited" by default which can
unintentionally result in an ever-increasing bill.
While choosing the instance size, make sure that it passes the minimum memory requirements of the underlying
operating system and applications. If the application has graphical users, then the operating system consumes
significant memory and CPU resources — therefore, the instance size should be large enough for many use cases.
Based on the memory and CPU growth requirements over time, scaling to a larger instance type will be required.
Conclusion
Although sizing your resources can be a challenge, there are several approaches you can take to make the task easier
and less risky for your application stability. The delegation of sizing may be free in some cases (such as Intelligent S3),
could cost you a premium for its convenience (such as Fargate), or can result in a surprise charge (such as T4g's
default unlimited burstable CPU). When used strategically, it can save you time and also money.
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