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DeWu Technology
DeWu Technology
Oct 11, 2023 · Fundamentals

Understanding JVM Pointer Compression and Memory Layout

The article explains how the JVM reduces memory consumption on 64‑bit systems by using compressed ordinary object pointers (compressed oops), describes pointer size, alignment and padding, shows C struct and JVM object layout examples, and demonstrates inspection tools like HSDB and XPocket for analyzing object memory footprints.

HSDBJVMJava
0 likes · 12 min read
Understanding JVM Pointer Compression and Memory Layout
Qunar Tech Salon
Qunar Tech Salon
Apr 9, 2019 · Fundamentals

Understanding Java Object Memory Layout and the Oop‑Klass Model

This article explains the JVM Oop‑Klass model, details how Java objects are represented in heap memory, shows how to calculate their size using source code analysis, HSDB, Instrumentation, Unsafe, and third‑party tools, and provides practical examples and code snippets.

HSDBInstrumentationJVM
0 likes · 15 min read
Understanding Java Object Memory Layout and the Oop‑Klass Model