Example for a 64 GB heap with low-latency requirements:
java -Xms64G -Xmx64G -XX:+UseZGC -XX:+UseCompressedOops To check if you're running a 64-bit JVM: java 64
Introduction When developers see the phrase "Java 64," they usually aren't talking about a specific JDK version. Instead, they refer to running Java applications on a 64-bit architecture using the 64-bit Java Virtual Machine (JVM). While 32-bit Java served us well in the early 2000s, modern applications—especially in big data, cloud microservices, and enterprise backends—demand the vast memory space and performance optimizations that 64-bit Java provides. Example for a 64 GB heap with low-latency
However, there's a trade-off: . Each object reference in the heap grows from 4 bytes (32-bit) to 8 bytes (64-bit). This increases memory consumption by approximately 30–50% for the same application, unless you enable Compressed Oops (Ordinary Object Pointers). Compressed Oops: The Game Changer Since Java 7 (and improved in Java 8+), the JVM can use compressed pointers : However, there's a trade-off:
java -version Look for 64-Bit in the output: