Java Performance Tuning

Java(TM) - see bottom of page

|home |services |training |newsletter |tuning tips |tool reports |articles |resources |about us |site map |contact us |
Tools: | GC log analysers| Multi-tenancy tools| Books| SizeOf| Thread analysers|

Our valued sponsors who help make this site possible
JProfiler: Get rid of your performance problems and memory leaks! 

News June 2006

JProfiler
Get rid of your performance problems and memory leaks!


Java Performance Training Courses
COURSES AVAILABLE NOW. We can provide training courses to handle all your Java performance needs

Java Performance Tuning, 2nd ed
The classic and most comprehensive book on tuning Java

Java Performance Tuning Newsletter
Your source of Java performance news. Subscribe now!
Enter email:



JProfiler
Get rid of your performance problems and memory leaks!


Back to newsletter 067 contents

I recently estimated that our performance testing procedures at one of our customer sites caught 70% of the performance issues before they could reach production. To me that means a whopping 30% are getting through, not necessarily something to shout about. But our customer sees it differently. As far as they were concerned it meant 7 out of 10 potentially serious issues that would cost them money, but would never be identified in QA, were stopped well before reaching production. The costs of those 70% reaching production would be hugely more expensive than the cost of trapping those 70% in pre-production testing.

Why would those issues not be identified in QA? Performance testing throws up a different set of problems from QA testing. QA testing rarely identifies concurrency bugs (race conditions that can lead to unexpected behavior typically including deadlocks, resource leaks and data corruption), nor does it give you a realistic feel for execution speeds or where the bottlenecks in code are. And these are just as much bugs as any functional bug - a project can fail from not achieving usable performance as well as from not meeting functional requirements.

A note from this newsletter's sponsor

Symantec i3 for J2EE helps you optimize application performance through
out the application life cycle. Its unique adaptive instrumentation
auto-adapts to application changes. Download an eBook on J2EE performance

So, to some extent, it didn't surprise me when Joshua Bloch reported an integer overflow bug has existed for over 20 years in the most popular binary sort implementation (see the news items below). I see these sorts of bugs regularly. Functional testing tests all sorts of edge conditions to worm out incorrect code and failure modes, but they do not test high load and high scales which are the typical conditions under which seemingly correctly coded data structures and associated algorthms start to break.

Now read on for our other news, including the links to that binary sort issue, this months selected articles and new tools, and of course our many new extracted performance tips.

A note from this newsletter's sponsor

Don't get burned by Java code problems in your applications. Learn
how to pinpoint performance problems and memory leaks before code
moves into production. Watch the Quest Software demo now.

News

Java performance tuning related news.

Tools

Java performance tuning related tools.

A note from this newsletter's sponsor

Wily Technology delivers what you need: Availability, Performance and Control
The most critical web applications in the world are managed by
software from Wily, the leader in enterprise application management

Articles

Jack Shirazi


Back to newsletter 067 contents


Last Updated: 2017-11-28
Copyright © 2000-2017 Fasterj.com. All Rights Reserved.
All trademarks and registered trademarks appearing on JavaPerformanceTuning.com are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries. JavaPerformanceTuning.com is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.
URL: http://www.JavaPerformanceTuning.com/news/news067.shtml
RSS Feed: http://www.JavaPerformanceTuning.com/newsletters.rss
Trouble with this page? Please contact us