gc-tuning

2 Posts

Java GC Logs: Turn on -Xlog and Read Every Line of Output

Set up java GC logs with -Xlog the right way, then read every line it prints: G1 and ZGC pause lines, phases, heap before and after, rotation, and analysers.

Java Heap Size in Containers: -Xmx vs MaxRAMPercentage

Java heap size in a container isn't what -Xmx says. How the JVM derives it from the cgroup limit, why 75% heaps still get OOMKilled, and how to budget the rest.