Java
1.1tomcat
1.2JVM
1.3Mysql
2.1SpringCloud
2.2SpringBoot
2.3Dubbo
4.1Spring
4.2SpringMVC
4.3MyBatis
5.1
5.2
5.3
!
1.1tomcat
1tomcat
1. JVM
-Xms<size>
JVM
-
Xmx<size>
JVM
80%
catalina.bat
JAVA_OPTS='-Xms256m-
Xmx512m' 256MB512MB
2.DNS
webIP
IPDNS
IP
DNS
DNS
server.xml
enableLookups
Tomcat4
<Connector
className="org.apache.coyote.tomcat4.CoyoteConnector"port="80"
minProcessors="5"maxProcessors="75"enableLookups="false"redire
ctPort="8443"
acceptCount="100"debug="0"connectionTimeout="20000"
useURIValidationHack="false"disableUploadTimeout="true"/>
Tomcat5
<Connectorport="80"maxThreads="150"minSpareThreads="25"
maxSpareThreads="75"enableLookups="false"redirectPort="8443"
acceptCount="100"debug="0"connectionTimeout="20000"
disableUploadTimeout="true"/>
3.
Con nector
Tomcat
Java
CPU
Tomcat4 minProcessors maxProcessors
minProcessors
51
5
maxProcessors maxProcessors
web server
Windows2000Linux1000
Tomcat5
maxThreads Tomcat
Tomcat
acceptCount
connnection Timeout 0
30000
minSpareThreadsTomcat
maxSpareThreads Tomcat
socket
web
2comcat
tomcat server.xml <Connector/>
minProcessors
10
maxProcessors
75
acceptCount maxProcessors
100
enableLookups truefalse
false
connectionTimeout 0
30000
maxProcessorsacceptCount
web server
Windows2000Linux1000tomcat5
<Connectorport="8080"
maxThreads="150"minSpareThreads="25"maxSpareThreads="75"
enableLookups="false"redirectPort="8443"acceptCount="100"
debug="0"connectionTimeout="20000"
disableUploadTimeout="true"/>
3tomcat
java.lang.OutOfMemoryError:Java
heap space
JAVA
1
Heap size
TOMCAT_HOME/bin/catalina.sh
setJAVA_OPTS=-Xms32m-Xmx512m
2 java-Xms32m-Xmx800m className
JAVAclassName
Eclispe
Eclipse->run-arguments VM arguments -Xms32m-
Xmx800m
Eclilpse VMarguments
-Xms32m-Xmx800m
java.lang.OutOfMemoryError:PermGen space
PermGen space Permanent Generation space ,
,
JVMClassMeta,ClassLoader
PermGen space ,(Instance)Heap
, GC(Garbage Collection) PermGen space
