tomcat7调优之Executor

最新推荐文章于 2020-10-21 11:10:47 发布

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最新推荐文章于 2020-10-21 11:10:47 发布

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分类专栏： tomcat调优文章标签： java

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本文详细介绍了Tomcat线程池的配置属性，包括线程优先级、后台进程方式、线程前缀、最大线程数、最小空闲线程数、最大空闲时间等，并解释了这些配置如何影响应用服务器的性能。

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The default implementation supports the following attributes:

Attribute	Description
`threadPriority`	(int) The thread priority for threads in the executor, the default is `Thread.NORM_PRIORITY 线程优先级（默认优先级）`
`daemon`	(boolean) Whether the threads should be daemon threads or not, the default is `true（是否以后台进程方式运行，默认是）`
`namePrefix`	(String) The name prefix for each thread created by the executor. The thread name for an individual thread will be `namePrefix+threadNumber（由线程前缀+线程数）`
`maxThreads`	(int) The max number of active threads in this pool, default is `200` 最大线程数（默认200） [root@M600-52 ~]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 16384 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 16384 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited max user processes (-u) 16384：最大进程数 cat /proc/sys/kernel/threads-max：最大线程数
`minSpareThreads`	(int) The minimum number of threads always kept alive, default is `25` 最小空闲时，还要保存的线程数。默认25
`maxIdleTime`	(int) The number of milliseconds before an idle thread shutsdown, unless the number of active threads are less or equal to minSpareThreads. Default value is `60000` (1 minute) 最大空闲时间默认60000(1分钟)
`maxQueueSize`	(int) The maximum number of runnable tasks that can queue up awaiting execution before we reject them. Default value is `Integer.MAX_VALUE` 在拒绝之前，会保存到队列当中，等待处理。队列的最大长度为Integer.MAX_VALUE
`prestartminSpareThreads`	(boolean) Whether minSpareThreads should be started when starting the Executor or not, the default is `false Executor刚启动时，是否就开启最小的线程数`
`threadRenewalDelay`	After a context is stopped, threads in the pool are renewed. To avoid renewing all threads at the same time, this delay is observed between 2 threads being renewed. Value is in ms, default value is 1000ms. If negative, threads are not renewed. 当线程停止后，如果有需要，会进行重建，为了避免多个线程，该设置可以检测是否有2个线程同时被创建，如果是，则会按照该参数，延迟指定时间创建。如果拒绝，则线程不会被重建。