Capacity Estimation

Metrics

1. 👥 DAU
2. Requests
   1. ⏱️ QPS
      1. 🏃‍♂️ Peak Load
      2. 📈 Response Time
   2. Concurrency

Components

1. CPU
2. RAM
3. 💽 Storage
4. Network Bandwidth
5. 💾 DB

Methods

6. Upfront 0. Back-of-the envelope estimation
   1. Forecasting
   2. Capacity Planning Tools
7. Live systems
   1. Testing
      1. Stress Testing
      2. Load Testing
   2. Traffic Analysis

Tools

8. Testing
   1. Locust - A modern load testing framework
   2. LoadRunner
   3. JMeter
9. Observability tools for monitoring
   1. 📈 Grafana
   2. 🔥 Prometheus
10. Networking
    1. Nagios

Good practices

1. Sizes
   1. Round numbers to speed up math
      1. Byte = 8 Bits ~= 10 Bits
   2. Memorize the commonly used sizes
   3. 10eN Name Storage