Java in Containers Recipes

IBM and Semeru Java in Containers Recipe

1. Review and test different CPU limits. Steady state requirements may be different from startup requirements, particularly due to JIT compilation (unless using JITServer).
2. In general, tune -XX:MaxRAMPercentage and -XX:InitialRAMPercentage instead of -Xmx and -Xms, respectively, to allow for more flexibility with sizing of containers at the host level. Default values depend on any container memory limit.
3. Consider using -XX:+ClassRelationshipVerifier to improve start-up time.
4. If using Semeru Java >= 11 and memory in the pod is limited, consider using the remote JITServer on available platforms to avoid potential throughput issues.

For details, see the Java J9 in Containers chapter.

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