CODEWITHSUNDEEP
javagarbage-collection
Dean Hiller
Dean Hiller

Reputation: 20190

jdk8 memory tuning with concurrent mark-sweep gc pause issue

We started with the setting for our JVM as(I inherited this and haven't modified it except trying incremental mode).... 

-XX:+UseConcMarkSweepGC
-XX:ParallelGCThreads=1

We are on two virtual cpus. I want way more gc pauses or what not rather than a getting behind one that stops the world. Supposedly CMSIncrementalMode is deprecated though I tried it anyways and it didn't work.

I am trying to work off of https://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/cms.html

I am having trouble understand what they mean by duty cycle. I just want more pauses rather than a big one. How can I tweak the commands to do this?

Even though the docs state this "Note that the incremental mode is being deprecated in Java SE 8 and may be removed in a future major release", I don't mind using the incremental if I need to for now.

Any ideas on how to configure this or what they mean by duty cycle?

NOTE: We deploy every two weeks so even right after deployment, I prefer not to have big gc pauses as pacing adapts.

thanks, Dean

Upvotes: 1

Views: 504

Answers (1)

Pushkar
Pushkar

Reputation: 571

If you use G1GC then you can use XX:MaxGCPauseMillis and set a lower value if default value is not desirable for you.

Upvotes: 1

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