ITPEC FE Morning October 2022 Question 15
ITPEC FE Morning October 2022 — Question 15 of 80
Server Throughput & Bottleneck — find system TPS limited by the slowest server.
Given two servers processing transactions independently:
| Server | CPU Limit | Time/Transaction | Max TPS | Effective TPS |
|---|---|---|---|---|
| Database | 80% | 5 ms | 1/0.005 = 200 | 200 × 0.80 = 160 |
| Web | 90% | 4 ms | 1/0.004 = 250 | 250 × 0.90 = 225 |
System throughput = throughput of the slowest server (bottleneck):min(160, 225) = 160 TPS
Why not others:
- (b) 225 — web server throughput only; database is the bottleneck
- (c) 250 — web server max TPS without CPU utilization limit
- (d) 385 — sum of both; incorrect because every transaction passes through both servers
Key rule: When the system throughput is determined by the lowest-throughput server, calculate each server's effective TPS = (1 / processing_time_in_seconds) × CPU_utilization, then take the minimum.
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