Maximum RPS: Ideal CPU, RAM, and EC2 Setup ?

Let’s determine the necessary CPU and Memory specifications for an EC2 instance on AWS to handle a system load of up to 10,000 requests per second (RPS), as well as the number of EC2 instances required.

CPU Calculation

• To estimate CPU requirements.

Requests per second (RPS) can be calculated as the product of the number of CPUs and the reciprocal of the task duration.

Number of CPU = RPS / (1 / Task duration) = RPS * Task duration

• RPS: Requests per second
• Number of cores
• Task duration

From the formula above we get:

Number of CPU = RPS / (1 / Task duration) = RPS * Task duration

Assume a request takes 5ms to process:

Number of CPU = 10000 * 0.005 = 50

Memory Calculation

• Relative formula for Memory.

RPS = (Total RAM / Task memory usage) * (1 / Task duration)
=> Total RAM = RPS * Task duration * Task memory usage

Lets assume a request takes 8ms to process and use 4GB

Total RAM = 10000 * 0.005 * 4 = 200GB

Conclusion

The article is for reference purposes only to provide the order of the articles and the calculation of the assumptions

Requests Per Second - What Does it Mean?｜Toucan Toco