By Benjamin J Evans, James Gough
Presently, no books exist that concentrate on the practicalities of Java program functionality tuning, in preference to the idea and internals of Java digital machines. This sensible consultant is the "missing link" that goals to maneuver Java functionality tuning from the world of guesswork and folklore to an experimental technological know-how. the best way to technique functionality difficulties in an constant and systematic means; get to the bottom of construction functionality matters via studying center Java functionality subject matters; determine and get to the bottom of functionality concerns earlier than encountering them in construction; comprehend the functionality difficulties you come upon through studying the Java platform's internals.
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Extra resources for Optimizing Java: Practical Techniques for Improved Performance Tuning
The TLBs that we met earlier in the chapter are a hardware feature that improve lookup times to physical memory. The use of the buffers improves performance for software’s access time to memory. However, the MMU is usually too low-level for developers to directly influence or be aware of. Instead, let’s take a closer look at the OS process scheduler, as this controls access to the CPU and is a far more user-visible piece of the operating system kernel. info Operating systems The Scheduler Access to the CPU is controlled by the process scheduler.
This gives the OS direct access to hardware. However, in a virtualized system, direct access to hardware by a guest OS is disallowed. One common approach is to rewrite the privileged instructions in terms of unprivileged instructions. g. of TLBs) during context switches. Some modern Intel-compatible CPUs have hardware features designed to improve the performance of virtualized OSs. However, it is apparent that even with hardware assists, running inside a virtual environment presents an additional level of complexity for performance analysis and tuning.
This demonstrates how the platform-independent parts of Java can call into services that are provided by the underlying operating system and hardware. In Chapter 3 we will discuss some details of how operating systems and hardware work. This is to provide necessary background for the Java peformance analyst to understand observed results. We will also look at the timing subsystem in more detail, as a complete example of how the VM and native subsystems interact. info Hardware & Operating Systems 3 Why should Java developers care about Hardware?