Most engineering candidates fail the system design interview not because they lack intelligence, but because they lack . Alex Wu’s PDF provides the "4-step framework" that has become the industry standard.
| Component | Latency (Approx) | | :--- | :--- | | L1 Cache Reference | 0.5 ns | | Main Memory Reference | 100 ns | | Mutex Lock/Unlock | 25 ns | | Send 2K bytes over 1 Gbps network | 20,000 ns | | Disk Seek (SSD) | 16,000 ns (16 µs) | | Disk Seek (HDD) | 10,000,000 ns (10 ms) | | Round trip in same data center | 500,000 ns (0.5 ms) |
While many users search for free PDFs, the content is proprietary. However, here is the best way to access them legitimately or through official channels:
