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Performance is now the area where Java is being put to the test, offering ever greater competitive advantage for those who master it. In this book, one of the world's leading software optimization experts presents 48 lessons that address virtually every aspect of Java server-side performance, Java Performance and Scalability, Volume I proves that, through careful attention to underlying source code and program design, the Java programming language can meet and exceed developers' greatest expectations. Dov Bulka targets the most common and critical Java performance pitfalls, offering dozens of practical tips and solutions covering each performance-critical area. Bulka has done the hard work of digging deep into the JDK to understand Java performance in unprecedented depth. This book includes not only code examples, but actual measurements quantifying the improvements they deliver. Coverage includes strings, containers, numerics, I/O, RMI, JDBC, servlets, JSP, and much more -- including a complete case study that walks through improving the performance of a Web server by a full order of magnitude.
- Sales Rank: #4289045 in Books
- Published on: 2000-06-02
- Original language: English
- Number of items: 1
- Dimensions: .67" h x 7.40" w x 9.20" l,
- Binding: Paperback
- 320 pages
Amazon.com Review
Written for the working programmer who wants to get more speed out of Java, Java Performance and Scalability, Volume 1 bundles several dozen tips for faster and smaller Java code. Backed up by benchmarks of what works and what doesn't, this book provides essential wisdom for eliminating some common bottlenecks to Java performance.
The 48 optimizations for various aspects of the Java API make up the heart of this text. Early sections look at a particularly tricky subject--string processing--giving you several techniques for increasing speed and reducing object creation. The in-depth examination of the costs and benefits of string concatenation and the immutability of Java String objects will help you uncover possible hot spots that cause lagging performance with strings.
Subsequent sections look at more general strategies for faster programs, like purging obsolete code, and the well-known 80-20 rule (optimizing the 20 percent of your code that consumes 80 percent of processing time, allowing you to create faster software; this book shows you how). Short tips on such APIs as Java collections and the Java Native Interface (JNI) come next.
The second half of the book zeros in on better server-side performance with tips on caching and file I/O. The guide to multithreading and synchronization is a standout here. You'll get several smart tips for speeding up servlets, such as precomputing your standard strings for headers and other boilerplate HTML. The book closes with a valuable custom class for JDBC database connection pooling and a custom HTTP server. Both samples make use of the techniques presented earlier in the text. Even if you don't adopt every suggestion, the ideas here can get you thinking about performance in new ways. (One of the main points of this book is that you can write faster custom code, instead of always relying on built-in Java classes and APIs.)
Clearly, Java performance is not something that happens by accident; it must be engineered into your code. This compilation of useful techniques and tips deserves a close look by anyone who wants to squeeze more performance out of Java. --Richard Dragan
Topics covered:
- Introduction to Java performance
- More efficient Java string handling (optimizing String, StringBuffer, and StringTokenizer objects)
- Reducing Java overhead
- Faster initialization
- The 80-20 rule for optimization
- Getting rid of obsolete code
- Speeding up the JDK 1.1 Vector and Hashtable collection classes
- Caching techniques
- Optimizing file I/O and buffering
- Object recycling and object pools
- Techniques for multithreading and synchronization
- Amdahl's law and scalability basics
- Pros and cons of using the Java Native Interface (JNI)
- Hints for optimizing Remote Invocation Method (RIM) calls
- Performance hints for servlets and JavaServer Pages (JSPs)
- Custom sample code for JDBC database connection pooling and a Java HTTP server
From the Inside Flap
Performance has been one of the dominant concerns hovering around Java from its infancy. Regardless of an order of magnitude speedup resulting from just-in-time (JIT) compilers, HotSpot, and other advances in JVM technology, the performance issue is still a legitimate concern. The reality facing Java programmers is that it is very easy to write slow Java programs. Java is a performance mine field and expert guidance is a must.
Given the importance of performance to Java developers, it is somewhat surprising that no book has been dedicated to this important topic. Almost any other Java-related issue has had multiple books dedicated to it--RMI, JNI, JDBC, threads, networking, and the list goes on. Conspicuously absent has been Java performance. It has been mentioned in passing by many authors but, to my knowledge, rarely has there been more than a chapter discussing it. This book is aiming to fill that gaping hole. It is entirely focused on Java performance issues from start to finish.
This book is written for Java programmers by a Java programmer. This is an important fact. It is very likely that the Java performance issues that I have dealt with in my code will surface in your code as well. The Java optimization techniques that you will find here will significantly elevate the performance and scalability of your Java programs.
There's plenty of material to cover. Let's get started.
0201704293P04062001
From the Back Cover
This book was written with one goal in mind: to provide Java programmers with the expertise needed to build efficient, scalable Java code. The author shares his experience in server-side performance tuning through measured performance assessments, called optimizations. Each optimization discusses techniques to improve the performance and scalability of your code. Every claim is substantiated with hard numbers and an experience-based evaluation. Java™ Performance and Scalability, Volume 1, provides invaluable advice that you will, no doubt, find useful in your coding.
Presented in 48 concise lessons that target the most common and critical performance pitfalls, this book offers a plethora of practical tips and solutions for boosting the performance of your programs. These lessons cover performance-critical areas such as memory management, garbage collection, caching, and multithreading.
Specific lessons include:
Reserving StringBuffer capacity Avoiding premature object creation Creating an efficient vector class Designing caching into your API The cost of synchronization Parallel subtasks JNI efficiency Varying the server workload and RMI network plumbing Using ServletOutputStream Caching JDBC™ connections In addition to providing hard numbers that quantify the optimizations, the author concludes the book with an application demonstrating the effectiveness of the performance optimizations. The exercise takes a typical program and increases its performance fourfold through a series of steps that tie together the lessons learned throughout the book. He offers both the means and the proof to better coding.
0201704293B04062001 Most helpful customer reviews
49 of 51 people found the following review helpful.
Professional Java programmers must read this book
By Joshua Engel
I was very skeptical when I picked up this book, because most authors on Java performance don't seem to have actually tested their theories. Dov Bulka, however, has included charts demonstrating actual performance gains. He's also shown how some kinds of purported optimizations _don't_ have a measurable effect, which is an excellent way of knowing what to avoid.
The author never compromises software engineering or program correctness in the pursuit of performance. His suggestions are practical and applicable to a wide variety of programs. The book is also well-written, clear, and a joy to read.
As the subtitle says, it's primarily about server-side processing. It's not going to tell you how to scroll tables faster, nor is it going to tell you to use a quicksort instead of a bubble sort. Still, every Java programmer should know how this author goes about working with Java performance, because it's a great framework for making improvements.
The book claims to be volume 1. I'm really looking forward to volume 2.
6 of 21 people found the following review helpful.
So far I'm unimpressed
By Joe 345
I bought this a couple of weeks ago and really just started it. However, it is distressing to find an error of the magnitude described in "Optimization 3" on page 14. There the author compares the execution times of String comparisons both case sensitive and case insensitive. It is noted that "an unintuitive result" is when one of the IgnoreCase compares executes faster than its same case equivalent. A reason that digs into Java internals of both "equals" and "equalsIgnoreCase" is offered. The problem I see is that in my book the IgnoreCase test is timed for 1 million iterations and the same case test for 10 million iterations! So either there is an error in the text or the comparison of "equivalent" benchmarks is false. Leaving one without useful conclusions. The publisher's (Addison-Wesley) website does little to help - it says the book has a supporting website, but doesn't provide a link - nor does there appear to be a link referenced in the book anywhere I could find. :(
4 of 4 people found the following review helpful.
An excellent, easy read that I could apply immediately.
By A Customer
This book covers the basics of improving the performance of server side java programs by writing different java statements. I like the fact that it had just the answers, not excessive amounts of padding. I especially liked the chapter on taking an existing, well written java program that was a web server, and optimising it in several stages. The stages were consistent with the optimisations discussed in the preceding chapters which helped put it those chapters into context nicely. The optimisations turned a good web server written in Java into a much faster one, which was good to see.
I describe this as a "basic" book on optimisation because the chapter on RMI was rather light, presumably because of the 80:20 rule wereby the biggest gains can be had with the simplest of coding changes. Going into more detail would have made the book thicker so perhaps it was best it was left as it was. There is perhaps an opportunity for someone to write an "advanced" version at some later stage.
I'd recommend this book to someone who is an experienced java programmer who wants to make their java programs run quicker. I certainly found it useful in my own java programs.
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