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conf/server.xml 中的线程池配置
```xml
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-" maxThreads="500" minSpareThreads="25" maxIdleTime="60000" prestartminSpareThreads="true" maxQueueSize="100" />
```
name: 线程名称
namePrefix: 线程前缀
maxThreads : 最大并发连接数，不配置时默认200，一般建议设置500~ 800 ，要根据自己的硬件设施条件和实际业务需求而定。
minSpareThreads：Tomcat启动初始化的线程数，默认值25
prestartminSpareThreads：在tomcat初始化的时候就初始化minSpareThreads的值， 不设置true时minSpareThreads
maxQueueSize: 最大的等待队列数，超过则拒绝请求
minSpareThreads：线程最大空闲时间60秒。
