Read e-book online Optimizing Java PDF

By Benjamin J. Evans, James Gough

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

Learn find out how to strategy functionality difficulties in an constant and systematic means; get to the bottom of construction functionality concerns by means of studying center Java functionality issues; establish and unravel functionality matters prior to encountering them in creation; comprehend the functionality difficulties you stumble upon by means of studying the Java platform's internals.

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This is a very important topic that we will return to later in the book, in Chapter 12. There has been a trend in recent years for software developers to seek greater understanding of the workings of hardware in order to derive better performance. The term “Mechanical Sympathy” has been coined by Martin Thompson and others to describe this approach, especially as applied to the low-latency and high-performance spaces. It can be seen in recent research into lock-free algorithms and data structures, which we will meet towards the end of the book.

1. The first two columns show the number of runnable and blocked processes. 2. In the memory section, the amount of swapped and free memory is shown, followed by the memory used as buffer and as cache. 3. The swap section shows the memory swapped from and to disk. Modern server class machines should not normally experience very much swap activity. 4. The block in and block out counts (bi and bo) show the number of 512byte blocks that have been received from, and sent to a block (I/O) device. 5.

This can lead to another thread starting to execute and accessing an object before the original thread had finished processing it, potentially seeing the object in a damaged or invalid state. The only defence the core of Java provides against this potential object damage during concurrent code execution is the mutual exclusion lock, and this can be very complex to use in real applications. Chapter 12 contains a detailed look at how the JMM works, and the practicalities of working with threads and locks.

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