Part 2: How I Calculate Capacity for Systems Design - 2
Capacity Estimation in System Design
Capacity estimation is essential to ensure that a system can handle its expected load and perform efficiently. It involves calculating the resources needed for processing/traffic handling, storage, and network bandwidth.
Key Rules for System Design Estimation Calculations
-
Rounding Approximations
- Simplify calculations by rounding to more manageable numbers.
- Example: Instead of calculating for 86,400 seconds in a day, use 100,000 (100K) seconds to simplify.
-
Powers of 2 and 10
- Familiarize yourself with powers of 2 and 10 for quick estimations.
- Example values for powers of 2: 2, 4, 8, 16, 32, 64, etc.
- Example values for powers of 10:
- (10^1 = 10)
- (10^2 = 100)
- (10^3 = 1,000)
- (10^6 = 1,000,000) (1 million)
- (10^9 = 1,000,000,000) (1 billion)
- (10^{12} = 1,000,000,000,000) (1 trillion)
-
Metric System
- Use metric system units for large numbers:
- 1 million = (10^6)
- 1 billion = (10^9)
- 1 trillion = (10^{12})
- Use metric system units for large numbers:
-
Storage Capacity
- Understand common storage units:
- 1 KB = (10^3) bytes
- 1 MB = (10^6) bytes
- 1 GB = (10^9) bytes
- 1 TB = (10^{12}) bytes
- 1 PB = (10^{15}) bytes
- Understand common storage units:
- Storage Assumption
Storage Assumption | Size |
---|---|
Single Char | 2 bytes |
Long/Double | 8 bytes |
Image | 200 KB |
Video | 2 MB |
-
Key Metrics to Memorize
- 1 million requests per day ≈ 12 requests/second
- 1 million requests per minute ≈ 700 requests/second
- 1 million requests per hour ≈ 4,200 requests/minute
-
Latency Numbers
- Familiarize yourself with common latency benchmarks to make informed decisions during system design.
Note: Google for a table of latency benchmarks for more details.
Table for Powers of 2 and 10
Power of 2 | Value | Power of 10 | Value |
---|---|---|---|
(2^1) | 2 | (10^1) | 10 |
(2^2) | 4 | (10^2) | 100 |
(2^3) | 8 | (10^3) | 1,000 |
(2^4) | 16 | (10^6) | 1,000,000 |
(2^5) | 32 | (10^9) | 1,000,000,000 |
(2^6) | 64 | (10^{12}) | 1,000,000,000,000 |
Article 2: How I Calculate Capacity for Systems Design - 2
More Details:
Get all articles related to system design
Hastag: SystemDesignWithZeeshanAli
Git: https://github.com/ZeeshanAli-0704/SystemDesignWithZeeshanAli
Top comments (0)