Understanding and use of tp50, tp90 and tp99

One TP50、TP90、TP99 The concept of

1.1 What is? TP

TP yes Top Percentile Abbreviation , Chinese translation Percentile .

1.2 What is the percentile

Percentile is a statistical term .

If you sort a set of data from small to large , And calculate the corresponding cumulative percentile , Then the value of the data corresponding to a certain percentile is called the percentile of the percentile . Can be expressed as ： A group of N individual Observed value Press The number Size arrangement . Such as , be in P% The value of the position is called P Percentiles .

1.3 TP50、TP90、TP99 How to understand

TP50、TP90、TP99 Is the engineering performance index , Take the time-consuming network request as an example ：

• TP50： Indicates the minimum time required to satisfy 50 percent of network requests .
• TP90： Indicates the minimum time required to satisfy 90 percent of network requests .
• TP99： Indicates the minimum time required to satisfy 99 percent of network requests .

Two  TP50、TP90、TP99 The calculation of

2.1 A simple example

for instance ： There are four requests that take ：

10ms,1000ms,100ms,2ms

Then we can calculate TP99：4 In this request ,99% The number of requests is 4*0.99, Round up, that is 4 Time , Meet all this 4 The minimum time consumption of this request is 1000ms, That is to say TP99 The answer is 1000ms.

2.2 python Realization

Application numpy Bag percentile Method realization  TP50、TP90、TP99 The calculation of .

import numpy as np

data = []
with open(' File path ', 'r') as f:
    for line in f.readlines():
        data.append(float(line.strip()))
    print(np.percentile(data, 95))

File path ： It's the absolute path , Such as /User/local/a.txt, among a.txt Is the time-consuming array of network requests .

You can put... In the code 95 Modified into 50、90、99, To achieve TP50、TP90、TP99 The calculation of .