Day 4 drills

Written on paper first. Tools: latency = work / (1 - utilization), and L = λ × W.

D1 (chai tapri, normal and 4 pm rush):

D2 (requests in flight, connections at 150 ms and 600 ms):

D3 (80% busy, traffic +15%):

D4 (max utilization, servers needed):

D5 (Mumbai local: throughput, latency, extra coaches, Little’s Law):