Question
Common Wealth Bank
AU
Last activity: 29 Jun 2018 11:13 EDT
Garbage Collector algorithms
We have recently upgraded our application from 7.1.9 to 7.4 version. we are experiencing slowness after upgrade. we configured the connection pooling as per suggested in the pdf. As part of Garbage collection currently we are using ParllelGC.
As we have many Garbage collector algorithms such as Parallel GC, CMS and G1. Which one is the fastest? What will happen if the GC changes from Parallel GC to G1 in Java 8. Will this support or do we go with CMS .
Also in The SMA the Garbage Collector And Log Usage is missing . Any idea where we can find this information in 7.4 SMA ?
Please suggest your comments at the earliest .
***Edited by Moderator Marissa to update platform capability tags***
Pegasystems Inc.
US
Hello,
Which app server are you using, and what version of Java? Pega has some recommendations. In particular, for Websphere 8 and later, use -Xgcpolicy:balanced
Common Wealth Bank
AU
Hi Adam,
We are currently using jboss application server and the java version is 8_x.
Os: red hat Linux
Ram : 8gb
Also there is a plan of migrating to Apache 8.5 tomcat server in feature.
Pegasystems Inc.
US
There's no specific requirements for GC in JBoss - the default should be fine (parallel, which you're using). It's not likely that GC is the issue here - Raju has some good suggestions.
Aaseya IT Solutions
IN
Compare the JVM arguments between old node and new node.
Including Permgen , newgen, survivor ratio etc.
Performance is a combination of multiple factors so its difficult to give a simple answer.
I am unable to find Garbage collector, but able to find log usage under "Logging and Tracing" in 7.4 SMA. I have attached the screenshot.
I will update once i find about GC.
Apple Inc
US
What GC you need to use is based on what your application do... i mean either your is Pega faceless application or UI as well as lot of services you consuming...
If you using Oracle JDK or OpenJDK its G1 or if its IBM JDK then you need use balanced.
There are many factor involved what ever you choose better go one round of performance test.
Thanks
Sree