Soft test (VII) performance test (1) brief introduction

Preface

This chapter mainly introduces 【 Performance testing 】

• ps： Why write performance test related content , To be honest, at present, the company I work in rarely conducts performance testing , Not that a complete performance testing platform has been built , It is simply used for some interfaces Jmeter Test it , But what? , This kind of problem is often encountered during the interview , So simply summarize

---

One 、 Basic concepts of performance testing

First of all, let's briefly mention Why should we do performance testing ？

• 1、 It can meet users' needs ： For example, like some Large amount of visits Website （ Microblogging , Take-out food ）, When the concurrent traffic reaches a certain level, the system will crash .
• 2、 Minimize costs ： For example, I don't know how many servers to deploy when a new service goes online , Simply put, if a server is slow , Just deploy a few more .
• 3、 Evaluate application system performance , Provide basis for system capacity planning of operation and maintenance 、 Provide application tuning reference for development

---

What aspects of development can we optimize performance ？

Under normal circumstances , The performance needs to be optimized , for instance High concurrency scenario , The whole performance is very low , Performance optimization is definitely needed in development , that How to optimize the performance of development , In fact, this is Java During the interview in the project, I often encounter （ Then I'll explain it briefly from my point of view ）

ps： There are many performance optimization methods , Here I will briefly talk about several things I know

• 1、sql tuning ( Query avoids full table query / avoid where After the statement or/and/>=/<=/like Full blur, etc )
  It was written a long time ago blog, It's easy to look at ：https://blog.csdn.net/Makasa/article/details/101218523
• 2、 Implementing distributed services
  For example, the current popular springboot Microservice architecture ,zookeeper+Dubbo Distributed service architecture , Simply put, it is to divide modules , We integrate the functions provided by a single service , Reduce the coupling before the code
• 3、 The page is static
  It is mainly generated dynamically html The page is saved as static content , Later, the user's request comes , Direct access to static pages , No longer rendered by services . It can greatly improve the response speed and concurrency of pages
• 4、 Use caching (redis…)
  It can reduce the reading and writing of the database , You can read the database for the first time , Then save the data to redis Inside , Then take the data directly from redis Take in
• 5、 You can buy more servers , Distribute concurrent visits

---

So what is performance testing ？

• Performance testing ： namely Simulate the impact of multiple user operations on server hardware performance

 It has some indicators ：
1、 Concurrency 
2、TPS（ throughput , Every time s Processing ability ）
3、RT（ response time ）
4、 Server resource usage (cpu The occupancy rate of 、 Memory usage 、 Inquire about Cache Command rate 、 disk IO Literacy rate )

---

---

Two 、 Common performance testing tools

• About Performance testing tools This piece of , At present, the following kinds are commonly used in the market , You can choose the corresponding performance testing tool according to your personal habits , It's about Jmeter,LoadRunner,Locust I have written relevant blogs briefly , If you want to learn more , Self access to information

  Jmeter special column ：https://blog.csdn.net/makasa/category_10230324.html

  LoadRunner：https://blog.csdn.net/Makasa/article/details/112471214

Apache ab：Apache HTTP Server performance benchmark tool

Apache Jmeter： Support a lot of protocols , Free open source , Use Java Language Development

LoadRunner： Support a lot of protocols , Toll collection software , Use C Language Development

Locust： Yes Web Interface , Support a lot of protocols , Free open source , Use python Language Development

nGrinder：Naver The company is based on Grinder Developed Performance test platform .Grinder Is one that can run jython（ stay JVM Running on python）、groovy Application idioms for writing test scripts . Freeware , Use Java Language development .（ function ngrinder-controller.war, The default account and password are admin）