如何在Tomcat中设置自定义垃圾收集器算法

Question

I want to set a custom garbage collector algorithm for my java application[war] which is running on top of tomcat. I am using java8 and the default garbage collector is parallelGC. I want to use G1GC or CMS GC instead of this.

java -XX:+UseG1GC -jar Application.java

A Jar application can be executed with the above command. But I want to know how we can configure this in tomcat/ with a war application?

Answer 1

我认为您可以在variables.conf文件中做到这一点，可以在其中添加如下代码：

-XX:+UseG1GC

Answer 2

Found an answer, I will post it here for the community usage

When we need to set a custom GC for tomcat, we can pass the GC type as a parameter to the CATALINA_OPTS env variable.

export CATALINA_OPTS = "-XX:+UseG1GC"

You can set this env variable in setenv.sh file(tomcat/bin/setenv.sh) or jvmsettings.sh file(/etc/profile.d/jvmsettings.sh). Addition to the GC type you can pass other jvm parameters to the same command

export CATALINA_OPTS="-Xms4096M -Xmx7168M -XX:+UseG1GC -XX:+PrintGCDetails -Xloggc:/settings/logs/gc.log"

After completing the configurations, restart the tomcat server. Then execute the following command to get the currently using GC type

jmap -heap <process_id>