Introduction

Use of Java Options depends on the Java release in use.

• Typically earlier Java releases include features that are not active by default.
• Such features can be active by default in later releases.

Heap Size

Heap size depends on memory consumption of each JS7 component that is related to

• the number of parallel users working with JOC Cockpit
• the number of workflows deployed to Controllers and Agents
• the number of parallel tasks
• the maximum outage that is resumed for the connection between Agents and Controller as well as the connection between Controller and JOC Cockpit.

For more details see JS7 - Sizing.

Find a few recommendations to start with

JAVA_OPTIONS="-Xms500m -Xmx1g"

JAVA_OPTIONS="-Xms500m -Xmx1g"

JAVA_OPTIONS="-Xms100m -Xmx1g"

Threads

xss

Garbage Collector

• It is recommended to activate the G1 Garbage Collector
• This applies to Java releases 1.8 to 11.
• For Java 17 G1 is the default Garbage Collector.

JAVA_OPTIONS="-XX:+UseG1GC"

String Deduplication

• String deduplication reduces memory consumption.

JAVA_OPTIONS="-XX:+UseStringDeduplication"