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99线理解

作者:互联网

首先给出Google到的答案:

The tp90 is a minimum time under which 90% of requests have been served.

tp90 = top percentile 90

Imagine you have response times:

10s
1000s
100s
2s

Calculating TP is very simple:

1. Sort all times in ascending order: [2s, 10s, 100s, 1000s]

2. find latest item in portion you need to calculate.
2.1 For TP50 it will be ceil(4*0.5) = 2 requests. You need 2nd request.
2.2 For TP90 it will be ceil(4*0.9) = 4. You need 4th request.

3. We get time for the item found above. TP50=10s. TP90=1000s

 

依此,翻译过来,TP99就是满足百分之九十九的网络请求所需要的最高耗时。同理TP999就是满足千分之九百九十九的网络请求所需要的最高耗时。

举个例子:有四次请求耗时分别为:

10ms,1000ms,100ms,2ms

那么我们可以这样计算TP99:4次请求中,99%的请求数为4*0.99,进位取整也就是4次,满足这全部4次请求的的最高耗时为1000ms,也就是TP99的答案是1000ms。

标签:1000ms,请求,TP99,99,耗时,理解,need,10s
来源: https://www.cnblogs.com/lzmrex/p/11214335.html