ThreadPoolTaskExecutor多线程使用，及线程池配置

1.配置 ThreadPoolTaskExecutor bean

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
    <!-- 扫描注解 -->
    <context:component-scan base-package="com.qi.quartz">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    
    <bean id="taskExecutor" name="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">  
        <!-- 核心线程数 线程池维护线程的最少数量 -->
        <property name="corePoolSize" value="10" />  
        <!-- 线程池维护线程所允许的空闲时间 -->
        <property name="keepAliveSeconds" value="200" />  
        <!-- 线程池维护线程的最大数量 -->
        <property name="maxPoolSize" value="20" />  
        <!-- 线程池所使用的缓冲队列 -->
        <property name="queueCapacity" value="100" /> 
        <!-- 线程池对拒绝任务(无线程可用)的处理策略 ThreadPoolExecutor.CallerRunsPolicy策略 ,调用者的线程会执行该任务,如果执行器已关闭,则丢弃.  -->
        <property name="rejectedExecutionHandler">
            <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
        </property> 
    </bean>  
    
</beans>

2.controller使用

package com.qi.quartz.web;

import javax.annotation.Resource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/test")
public class ThreadPoolExcuteController {
    
    Logger LOG = LoggerFactory.getLogger(ThreadPoolExcuteController.class);
    
    @Resource(name = "taskExecutor")
    private ThreadPoolTaskExecutor taskExecutor;

    @RequestMapping("/execute")
    @ResponseBody
    public void execute(){
        taskExecutor.execute(new Runnable(){

            public void run() {
                try {
                    LOG.info("执行线程任务开始前");
                    Thread.currentThread().sleep(10000);
                    if (LOG.isDebugEnabled()) {
                        LOG.info("执行线程任务结束");
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            
        });
    }

}

3.使用 apache ab 并发测试

/usr/local/apache2/bin/ab -n 1000 -c 1000 http://192.168.8.101:8080/QuartzDemo/test/execute

Benchmarking 192.168.8.101 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests

Server Software: Apache-Coyote/1.1
Server Hostname: 192.168.8.101
Server Port: 8080

Document Path: /QuartzDemo/test/execute
Document Length: 3 bytes

Concurrency Level: 1000
Time taken for tests: 41.982 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 163000 bytes
HTML transferred: 3000 bytes
Requests per second: 23.82 [#/sec] (mean)
Time per request: 41982.345 [ms] (mean)
Time per request: 41.982 [ms] (mean, across all concurrent requests)
Transfer rate: 3.79 [Kbytes/sec] received

Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 304 211.4 291 1077
Processing: 172 22968 13412.1 21237 41240
Waiting: 161 22900 13455.0 21174 41171
Total: 472 23272 13441.8 21505 41944

Percentage of the requests served within a certain time (ms)
50% 21505
66% 31398
75% 31725
80% 40963
90% 41467
95% 41605
98% 41930
99% 41939
100% 41944 (longest request)

我们配置的核心处理10个线程，最大20个，缓冲队列100，总耗时41.982，随着我们更改这些配置的时候，处理的情况就不同了。

更改配置为

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
    <!-- 扫描注解 -->
    <context:component-scan base-package="com.qi.quartz">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    
    <bean id="taskExecutor" name="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">  
        <!-- 核心线程数 线程池维护线程的最少数量 -->
        <property name="corePoolSize" value="100" />  
        <!-- 线程池维护线程所允许的空闲时间 -->
        <property name="keepAliveSeconds" value="200" />  
        <!-- 线程池维护线程的最大数量 -->
        <property name="maxPoolSize" value="100" />  
        <!-- 线程池所使用的缓冲队列 -->
        <property name="queueCapacity" value="500" /> 
        <!-- 线程池对拒绝任务(无线程可用)的处理策略 ThreadPoolExecutor.CallerRunsPolicy策略 ,调用者的线程会执行该任务,如果执行器已关闭,则丢弃.  -->
        <property name="rejectedExecutionHandler">
            <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
        </property> 
    </bean>  
    
</beans>

执行测试

./ab -n 1000 -c 1000 http://192.168.8.101:8080/QuartzDemo/test/execute

1000个请求，每次 1000个并发

结果

Server Software:        Apache-Coyote/1.1
Server Hostname:        192.168.8.101
Server Port:            8080

Document Path:          /QuartzDemo/test/execute
Document Length:        0 bytes

Concurrency Level:      1000
Time taken for tests:   22.452 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      121121 bytes
HTML transferred:       0 bytes
Requests per second:    44.54 [#/sec] (mean)
Time per request:       22452.351 [ms] (mean)
Time per request:       22.452 [ms] (mean, across all concurrent requests)
Transfer rate:          5.27 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        1  216 403.0     95    3035
Processing:   210 6209 6834.3   1431   21534
Waiting:      209 6208 6834.3   1431   21534
Total:        334 6425 7071.3   1529   22421

Percentage of the requests served within a certain time (ms)
  50%   1529
  66%  11318
  75%  11630
  80%  11830
  90%  21315
  95%  22316
  98%  22338
  99%  22353
 100%  22421 (longest request)

可以看出仅用了22.452 秒，但是我们的请求数却高出了很多  1000*1000-100*100 = 990000。

当然了，至于开多少个线程，还要看机器如何了。