JVM compiles bytecode at runtime into machine readable instructions as opposed to interpretting

JIT Compilation (in JVM) Builds off of bytecode idea A Java Compiler compiles high level Java Goal: surpass the performance of static compilation, while maintaining the advantages of bytecode interpretation -Wikipedia Traditional Java Compilation and ExecutionĬombine speed of compiled code w/ flexibility of interpretation Machines) reflection: modification of program at runtimeĭrawbacks need memory not as fast as running pre-compiled machine JVM interprets bytecode to machine instructions at runtimeĪdvantages platform independence (JVM present on most Source code to Java bytecode readable by JVM Traditional Java Compilation and Execution 2 steps A Java Compiler compiles high level Java

Traditional Java Compilation and Execution What JIT Compilation brings to the table Optimization Techniques JIT Compilation in JRockit/HotSpot JVMs JRockit Breakdown and Optimization Traditional Java Compilation and Execution What JIT Compilation brings to the table Optimization Techniques JIT Compilation in JRockit/HotSpot JVMs JRockit Breakdown Optimization Example JIT Compilation elsewhere

Compilation done during execution of a program (at run time) rather than prior to execution -Wikipedia Seen in todays JVMs and elsewhere

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