Optimizing Java by Benjamin J. Evans, James Gough

By Benjamin J. Evans, James Gough

Presently, no books exist that concentrate on the practicalities of Java software functionality tuning, in preference to the idea and internals of Java digital machines. This useful consultant is the "missing link" that goals to maneuver Java functionality tuning from the world of guesswork and folklore to an experimental science.

Learn how one can technique functionality difficulties in an constant and systematic approach; get to the bottom of construction functionality concerns via studying center Java functionality issues; determine and get to the bottom of functionality concerns sooner than encountering them in creation; comprehend the functionality difficulties you come upon by way of studying the Java platform's internals.

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Since then, however, the world of the application developer has, to a large extent, revolved around the Intel x86 / x64 architecture. This is an area of technology that has undergone radical change and many advanced features now form important parts of the landscape. The simple mental model of a processor’s operation is now completely incorrect, and intuitive reasoning based on it is extremely liable to lead to utterly wrong conclusions. To help address this, in this chapter, we will discuss several of these advances in CPU technology.

Println("Millis elapsed: " + (end - start)); Running this code will cause wildly divergent results, depending on operating system. Most Unixes will report 10-20% overhead. 8s). There are even reports that some proprietary OS vendors have inserted code into their releases in order to detect benchmarking runs and cheat the metrics. Timing is of critical importance to performance measurements, to process scheduling and to many other parts of the application stack, so let’s take a quick look at how timing is handled by the Java platform (and a deeper dive into how it is supported by the JVM and the underlying OS).

We will have a great deal to say about GC and the resulting logs, later in the book. info I/O their operations staff and confirm whether GC logging is on in production. If not, then one of the key points of Chapter 8 is to build a strategy to enable this. I/O File I/O has traditionally been one of the murkier aspects of overall system performance. Partly this comes from its closer relationship with messy physical hardware, with engineers making quips about “spinning rust” and similar, but it is also because I/O lacks as clean abstractions as we see elsewhere in operating systems.

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