jit

问题 I\'ve heard this term used, but I\'m not entirely sure what it means, so: What DOES it mean and what DOESN\'T it mean? What are some examples of what IS and ISN\'T microbenchmarking? What are the dangers of microbenchmarking and how do you avoid it? (or is it a good thing?) 回答1: It means exactly what it says on the tin can - it's measuring the performance of something "small", like a system call to the kernel of an operating system. The danger is that people may use whatever results they

问题 Is there some way to see the native code produces by the JIT in a JVM? 回答1: Assuming you're using the Sun Hotspot JVM (i.e. the one provided on java.com by Oracle), you can add the flag -XX:+PrintOptoAssembly when running your code. This will print out the optimized code generated by the JIT compiler and leaves out the rest. If you want see the entire bytecode, including the unoptimized parts, add -XX:CompileThreshold=# when you're running your code. You can read more about this command and