June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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考虑生产环境中的问题
｜
125
Request latency:
min: 1.8
max: 10.3
median: 2.5
p95: 4.2
p99: 5.4
Codes:
200: 200
All virtual users finished
Summary report @ 16:43:38(-0700) 2019-04-14
Scenarios launched: 10
Scenarios completed: 10
Requests completed: 200
RPS sent: 145.99
Request latency:
min: 1.8
max: 10.3
median: 2.5
p95: 4.2
p99: 5.4
Scenario counts:
0: 10 (100%)
Codes:
200: 200
这个测试是在我的开发笔记本计算机上运行的。你可以看到，
Express
响应任何请求的时
间都不超过
10.3
毫秒
，其中
99%
的请求不超过
5.4
毫秒。至于你的预期应该是什么样的数
值，我没法提供具体的参考，但是为了保证应用比较精悍，你的预期总连接时间应该保持
在
50
毫秒
以下。（别忘了这只是服务器要把数据发送到客户端所花的时间，客户端还需要
时间渲染它，因此数据传输的时间越少越好。）
如果你定期对应用进行压力测试，并跟基准数据对照，就能够发现问题。如果你刚刚完成
了一个新特性，结果发现连接时间飙升到了
3
倍
，或许就要对这个新特性做一点儿性能调 ...
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