Java Memory Calculator

Calculate JVM memory allocation based on Cloud Foundry / Paketo Buildpack formula.

JVM Memory

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Cloud Foundry / Paketo Buildpack의 Java Memory Calculator와 동일한 로직으로 JVM 메모리 영역별 할당량을 계산합니다.

Calculate는 세부 설정으로 계산, Recommend는 실제 사용량 기반 추천, Quick은 총 메모리만으로 즉시 추천합니다.

Paketo BuildpackCloud FoundryJVM Flags

Total Memory

Loaded Class Count

Thread Count

Head Room (%)

Stack Size (MB)

Reserved Code Cache (MB)

Direct Memory (MB)

Heap

400.0 MB (39.1%)

Metaspace

124.0 MB (12.1%)

Code Cache

240.0 MB (23.4%)

Thread Stacks

250.0 MB (24.4%)

Direct Memory

10.0 MB (1.0%)

Headroom

0.0 MB (0.0%)

Total1024.0 MB

-Xms400M -Xmx400M -XX:MaxMetaspaceSize=124M -XX:ReservedCodeCacheSize=240M -XX:MaxDirectMemorySize=10M

Formula

Metaspace = (5,800 x loadedClassCount) + 14,000,000 bytes

Thread Stacks = stackSize x threadCount

Headroom = totalMemory x (headRoom% / 100)

Heap = Total - Metaspace - CodeCache - ThreadStacks - DirectMemory - Headroom