利用ab测试阻塞与非阻塞式异步编程的性能

水深无声 2022-12-24 13:51 90阅读 0赞

# 一。 待测试的代码 #

##   1. 非阻塞式异步编程代码: ##

@RestController
    @RequestMapping("/test")
    public class TestController {
        @Autowired
        private PiclibFuture piclibFuture;   // 异步方案
    
        @Autowired
        private PiclibRestService piclibRestService;  //同步方案
    
        @RequestMapping(value = "/list")
        public CompletableFuture<String> findAll() {
            // return piclibFuture.findPage(1, 2, "good").thenApply(page -> page);
            return piclibFuture.findPage(1, 2, "good").thenApply(new Function<String, String>() {
                @Override
                public String apply(String page) {
                    return page;
                }
            });
        }
    
       
    }

#  2. 阻塞式编程代码: #

@RequestMapping(value = "/list1")
        public String findAll1() {
            return piclibRestService.findAll(1, 2, "good");
        }

# 二. 环境准备: #

## 1. apache的"ab"是一个性能测试工具，请先下载: ##

链接：https://pan.baidu.com/s/1-599gDnpnQdpPfo9ezLDmg 
    提取码：7b1p

2. 解压后将文件夹放到C盘. （如是其它盘的话，须要手工配置一下)

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neWluZ2NoZW5ncWk_size_16_color_FFFFFF_t_70][]

3. 进入目录后，按下  "shift"+右击， 选择powershell,打开命令行.

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5neWluZ2NoZW5ncWk_size_16_color_FFFFFF_t_70 1][]

4. ab测试命令非常简单,请看下面测试.

ab -n 1000 -c 10 http://localhost:8095/test/list

参数解释:

-n 请求数
    -c   并发数

5.     测试结果解析:

对于压测试结查，只要考虑" Failed requests:0",即当失败请求为0，时，表示所有请求已经全部放行，则通过压力测试，否则表示没有通过。不能通过时，减少并发数进行重新测试，直至所有请求都能通过，即可确定它的最大可承受的并发数大小.

在mac os中ab最大极限只能执行大约1000个请求，500个并发，在windows中大约可执行1000个请求，1000个并发。

在我们这个项目中， 没有使用异步编程方法，在1000个请求中，最大并发只有10.  而在异步编程的情况下，在1000个请求中，最大并发可达1000.

以下是异步请求结果.

PS C:\Apache24\bin> ./ab.exe -n 1000 -c 10 http://localhost:8095/test/list
    This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
    Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
    Licensed to The Apache Software Foundation, http://www.apache.org/
    
    Benchmarking localhost (be patient)
    Completed 100 requests
    Completed 200 requests
    Completed 300 requests
    Completed 400 requests
    Completed 500 requests
    Completed 600 requests
    CCompleted 800 requests
    CCompleted 1000 requests
    Finished 1000 requests
    
    
    Server Software:
    Server Hostname:        localhost
    Server Port:            8095
    
    Document Path:          /test/list
    Document Length:        249 bytes
    
    Concurrency Level:      10
    Time taken for tests:   6413.856 seconds
    Complete requests:      1000
    Failed requests:        0
    Total transferred:      383000 bytes
    HTML transferred:       249000 bytes
    Requests per second:    0.16 [#/sec] (mean)
    Time per request:       64138.561 [ms] (mean)
    Time per request:       6413.856 [ms] (mean, across all concurrent requests)
    Transfer rate:          0.06 [Kbytes/sec] received
    
    Connection Times (ms)
                  min  mean[+/-sd] median   max
    Connect:        0    0   0.4      0       1
    Processing:   191 57773 595576.7    583 6304703
    Waiting:      191 57772 595576.7    582 6304703
    Total:        191 57773 595576.7    583 6304704
    
    Percentage of the requests served within a certain time (ms)
      50%    583
      66%    819
      75%    980
      80%   1029
      90%   1205
      95%   1308
      98%   1704
      99%  44699
     100%  6304704 (longest request)

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