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Questions to Determine

  • What does the OOM killer dmesg output show about the process that was killed and the memory state?
  • What is the total RSS (resident set size) of the Java process at the time of the kill?
  • Is the JVM heap the only source of memory consumption, or is there significant off-heap/native memory usage?
  • How much memory do other processes on the system consume?
  • Is the -Xmx12g setting appropriate for a 16 GB system given OS and non-heap overhead?
  • Are there cgroup memory limits applied to the process?
  • What is the oom_score_adj for the Java process?
  • Is swap intentionally disabled, and would enabling it help or hurt?
  • Is the application leaking memory (heap or native)?