JVM داخل حاوية

في هذا الدرس

size heap and container limits so they fit together.

الموضوعات المخطط لها

• Modern JVMs read cgroup limits; the default max heap is a fraction of container memory.
• Set it explicitly with -XX:MaxRAMPercentage (for example 60-75), not a fixed -Xmx that ignores the limit.
• Heap is only part of process memory: metaspace, thread stacks, code cache, direct buffers also count.
• If total exceeds the limit, the container is OOM-killed (exit 137), with no Java exception.
• Set CPU limits knowing they change the GC and compiler thread counts.