https://confluence.atlassian.com/adminjiraserver/performance-and-scale-testing-965568707.html 

Performance and scale testing

我看了一下, 我好流口水：

我一台1.4万的Dell R730XD 二手，留了8G内存给jira，又不是SSD硬盘。咋办呢，不是土豪还想用土豪的速度。

调优呗，上手段，别问，问了就是。。。。

setenv.sh 改动： 增加内存，增加性能监视代理 

## The following 2 settings control the minimum and maximum given to the JIRA Java virtual machine.??In larger JIRA instances, the maximum amount will need to be increased. # #JVM_MINIMUM_MEMORY="384m" #JVM_MAXIMUM_MEMORY=“2048m" 
?#modified by Rock on 2020.03.09? 
JVM_MINIMUM_MEMORY="768m" JVM_MAXIMUM_MEMORY=“3072m” 

## The following setting configures the size of JVM code cache.??A high value of reserved size allows Jira to work with more installed apps. #? 
#JVM_CODE_CACHE_ARGS='-XX:InitialCodeCacheSize=32m -XX:ReservedCodeCacheSize=512m’? 
#modified by Rock on 2020.03.09? 
JVM_CODE_CACHE_ARGS='-XX:InitialCodeCacheSize=96m -XX:ReservedCodeCacheSize=1280m' 


#----------------------------------------- 
# Prevents the JVM from suppressing stack traces if a given type of exception # occurs frequently, which could make it harder for support to diagnose a problem.? 
#-----------------------------------------? 
JVM_EXTRA_ARGS="-XX:-OmitStackTraceInFastThrow -Djava.locale.providers=COMPAT -javaagent:/root/tingyun/tingyun/tingyun-agent-java.jar” 

用了听云的APM

接着升级java 8 到java 11

安装openjdk 11 

yum search openjdk 
yum install java-11-openjdk.x86_64 

查找jdk路径 
[root@CEN07_JIRA bin]# echo $JAVA_HOME 
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64 


[root@CEN07_JIRA jvm]# ll 
total 0 
lrwxrwxrwx. 1 root root 26 Jan 23 00:22 java -> /etc/alternatives/java_sdk 
drwxr-xr-x. 6 root root 68 Mar??9 18:11 java-11-openjdk-11.0.6.10-1.el7_7.x86_64 
lrwxrwxrwx. 1 root root 32 Jan 23 00:22 java-1.8.0 -> /etc/alternatives/java_sdk_1.8.0 
lrwxrwxrwx. 1 root root 40 Jan 23 00:22 java-1.8.0-openjdk -> /etc/alternatives/java_sdk_1.8.0_openjdk 
drwxr-xr-x. 7 root root 68 Jan 23 00:22 java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64 
lrwxrwxrwx. 1 root root 34 Jan 23 00:22 java-openjdk -> /etc/alternatives/java_sdk_openjdk 
lrwxrwxrwx. 1 root root 21 Mar??9 18:11 jre -> /etc/alternatives/jre 
lrwxrwxrwx. 1 root root 24 Mar??9 18:11 jre-11 -> /etc/alternatives/jre_11
lrwxrwxrwx. 1 root root 32 Mar??9 18:11 jre-11-openjdk -> /etc/alternatives/jre_11_openjdk 
lrwxrwxrwx. 1 root root 40 Mar??9 18:11 jre-11-openjdk-11.0.6.10-1.el7_7.x86_64 -> java-11-openjdk-11.0.6.10-1.el7_7.x86_64 
lrwxrwxrwx. 1 root root 27 Jan 23 00:22 jre-1.8.0 -> /etc/alternatives/jre_1.8.0 
lrwxrwxrwx. 1 root root 35 Jan 23 00:22 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk 
lrwxrwxrwx. 1 root root 51 Jan 23 00:22 jre-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64 -> java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre 
lrwxrwxrwx. 1 root root 29 Mar??9 18:11 jre-openjdk -> /etc/alternatives/jre_openjdk 

替换jre-8 成为jre-11 
setenv.sh 

# DO NOT remove the following line 
#JAVA_HOME="/opt/atlassian/jira/jre/"; export JAVA_HOME 
#Modified by Rock on 2020.03.09 - change jre to jre 11 :) 
JAVA_HOME="/usr/lib/jvm/jre-11"; export JAVA_HOME 

重启，试试。

对了忘记说了结果如何？

结果是感人的，其实，我发现了如果把虚拟机的CPU调到8

你会发现jira飞起来了，

太晚了，就做对比了。

总结一个就苟了，

• - 增加内存，似乎影响不大
• - 增加CPU，提升很大
• - 增加磁盘速度，貌似提升很大 - 注意到磁盘使用很高情况，

更新一下： 2020.05.02， 貌似升级jdk11反而影响性能，我重新退回到jdk8，速度提升很多。