JProfiler Get rid of your performance problems and memory leaks! Modern Garbage Collection Tuning 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: Training online Threading Essentials course JProfiler Get rid of your performance problems and memory leaks!

Back to newsletter 165 contents

The big news of the month is that Oracle has updated their Garbage Collection Tuning guide and their Troubleshooting guide (see the tools section below for links).

A note from this newsletter's sponsor

The GC tuning guide includes details about ergonomics, the various collectors (note it places G1 together with CMS as 'mostly' concurrent GCs); generations, sizing, GC phases, and much more.

The troubleshooting guide includes details of looking at memory leaks, several types of performance issues, crash analysis, and coverage of the following tools: the JVM, HPROF, JConsole, Java Mission Control, jcmd, jdb, jhat, jinfo, jmap, jps, jrunscript, jstack, jstat, jstatd, visualgc.

Of course, there's nothing new for anyone who's been reading our newsletters over the years, but you can't remember everything and these pages are a good reference starting point for any issues.

And finally worth mentioning, new tool documentation has been added for the JVM usage tracker (the tool has been available since 1.4, but the documentation has only now been added). See the tools section below for the link, and see all our usual sections: links to articles, news and as ever, all the extracted tips from all of this month's referenced articles.

A note from this newsletter's sponsor

News

Java performance tuning related news.

• New StringDeduplication options in Java8u20: -XX:+UseStringDeduplication, -XX:StringDeduplicationAgeThreshold=threshold, -XX:+PrintStringDeduplicationStatistics (only enableable with G1 Garbage Collector)
• The advanced management console is released
• Java Mission Control 5.4.0 released with Java8u20 - includes an Eclipse plug-in and some changes
• Understanding Java JIT Compilation

Tools

Java performance tuning related tools.

• Oracle GC Tuning guide updated to Java 8
• Oracle JVM Troubleshooting guide updated to Java 8
• JVM Usage Tracker documentation
• Log analyser / visualiser for Java HotSpot JIT compiler

A note from this newsletter's sponsor

Articles

• Garbage Collection is Good! (Eva Andreasson/InfoQ)
• Clean Readable Performant Java (Nathan Tippy/Object Computing, Inc.)
• Try optimising memory consumption first (Peter Lawrey/vanillajava)
• Time - memory tradeoff with the example of Java Maps (Roman Leventov/DZone)
• The many meanings of volatile read and write (Nitsan Wakart/Psychosomatic, Lobotomy, Saw)
• Understanding Latency (Gil Tene/InfoQ)

Jack Shirazi

Back to newsletter 165 contents