The JVM is a stack-based interpreted machine. This means that rather than having registers (like a physical hardware CPU), it uses an execution stack of partial results and performs calculations by operating on the top value (or values) of that stack.
Class file structure
- 0xCAFEBABE
- constant pool
- access flag
- Access flags are used to determine the modifiers applied to the class. The first part of the flag identifies general properties, such as whether a class is public, followed by whether it is final and cannot be subclassed. The flag also determines whether the class file represents an interface or an abstract class. The final part of the flag indicates whether the class file represents a synthetic class that is not present in source code, an annotation type, or an enum.
Operators
aload_0places this references onto the first place position in the stack.invokespecialinvokes an instance method that has specific handling for calling superconstructors and creating objects.
GC
G1GC
Quotes
Optimizing Java
GC logs
High numbers of application threads will also have an impact on GC times, as they represent more stack frames to scan and more time needed to reach a safepoint. They also exert more pressure on thread schedulers in both bare metal and virtualized environments.
How to
Compile JDK on Macos
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