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Question

 Masashi Tsuneizumi (tsunm)
PEGA
Senior Principal Demo Engineer
Pegasystems Inc.
JP
tsunm Member since 2014 15 posts
PEGA
Posted: Jul 4, 2018
Last activity: Jul 4, 2018
Posted: 4 Jul 2018 2:50 EDT
Last activity: 4 Jul 2018 22:01 EDT
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Impact for JVM memory management change from Java 7 to Java 8

The memory management has been changed from Java 8 - permanent generation space has gone from heap and metaspace in native memory is introduced.

  1. Does this change impact on the JVM configuration (in this article)? (We may need to replace -XX:PermSize, -XX:MaxPermSize by -XX:MetaspaceSize, -XX:MaxMetaspaceSize. Anything else to consider?)
  2. We had done H/W sizing. The sizing sheet doesn't require to input JDK version. Is that mean this change is not impact on memory estimates in H/W sizing?
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Accepted Solution

Posted: 6 years ago
Posted: 4 Jul 2018 12:35 EDT
Chandrasekhar Gollamudi VN (chandrasekhar_g)
PEGA
Senior Manager, Technical Support - Runtime Engine and Search
Pegasystems Inc.
IN

Hi,

Permgen is replaced with metaspace in Java 8. This change does not have impact on JVM and H/W sizing.

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