操作系统设置

limit

╭─sky@sky-linux ~
╰─➤  ulimit -a
-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-m: resident set size (kbytes)      unlimited
-u: processes                       63555
-n: file descriptors                1024
-l: locked-in-memory size (kbytes)  64
-v: address space (kbytes)          unlimited
-x: file locks                      unlimited
-i: pending signals                 63555
-q: bytes in POSIX msg queues       819200
-e: max nice                        0
-r: max rt priority                 0
-N 15:                              unlimited

会话级别

如果不想全局设置limit,可以在会话级别设置,即在启动程序之前,设置好limit后再启动程序

# 硬设置
ulimit -Hc unlimited
ulimit -Hn 65535


# 软设置
ulimit -Sc unlimited
ulimit -Sn 65535

全局设置limit

编辑 /etc/security/limits.conf 文件.添加或修改为如下

*               soft    core            unlimited
*				hard	core			unlimited
* 				soft    nofile			65535
*				hard	nofile			65535

Tomcat自身设置

统一UTF-8

<Connector port="8095" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" URIEncoding="UTF-8" useBodyEncodingForURI="true"/>

关闭 auto-deploy

<Host name="localhost"  appBase="webapps" unpackWARs="true" autoDeploy="false">

Tomcat线程池

  • threadPriority: 线程的优先级
  • minSpareThreads:最小一定存活线程数,这个是会一直保持的,默认为25
  • maxThreads: 最大同时存活线程数,默认为200
  • daemon:是否是守护线程,默认为true.
  • maxIdleTime: 最大空闲时间,单位是毫秒。即线程达到了这个时间后,就会shutdown,直到线程数达到了minSpareThreads数.
  • maxQueueSize:最大任务队列数。默认值为Integer.MAX_VALUE
  • prestartminSpareThreads: 启动时,是否初化minSpareThreads的线程。默认为false.
  • threadRenewalDelay: 重建线程池的线程的时间间隔。(前提是配置了ThreadLocalLeakPreventionListener。 默认为1000ms。如果为负,则不重建.
  • namePrefix:线程名前的前缀
<Executor name="tomcatThreadPool" namePrefix="mytomcat-exec-" maxThreads="150" minSpareThreads="4"/>

然后在Connector里配置使用线程池

<Connector port="8095" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" URIEncoding="UTF-8" useBodyEncodingForURI="true" executor="tomcatThreadPool" />

Tomcat文档

JVM 配置

#!/bin/sh

JVM_TYPE = " -server"

JVM_GC=" -XX:+PrintGCDateStamps -verbose:gc -XX:+PrintGCDetails -Xloggc:/tmp/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10M"
JVM_DUMP=" -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/jvm-dump-`date`.hprof"

JVM_GC_TYPE=" -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=90  -XX:+ScavengeBeforeFullGC -XX:+CMSScavengeBeforeRemark"

# 单位:秒
JVM_DNS_CACHE=" -Dsun.net.inetaddr.ttl=60"

# hostname如果为远程,则是外网的IP
JVM_RMI=" -Djava.rmi.server.hostname=127.0.0.1 -Dcom.sun.management.jmxremote.port=8888 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"

# survivorratio = eden / from 的比值

JVM_MEM=" -Xms512m -Xmx1024m  -XX:PermSize=512m -XX:MaxPermSize=1024m  -Xmn300m -XX:SurvivorRatio=8"


JVM_DEBUG=" -Xdebug -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n"

CATALINA_OPTS=" -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager ${JVM_TYPE} ${JVM_GC_TYPE} ${JVM_GC} ${JVM_DUMP} ${JVM_DNS_CACHE} ${JVM_RMI} ${JVM_MEM} ${JVM_DEBUG} "