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The Oracle roadmap has Java 12 set to be delivered in 2021. Now that's what I call vision.

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What have we in the Java performance community got to look forward to over the intervening years? I've been looking over what's been mentioned, and I see the following

• convergence of the JVMs into a one size-fits-all kernel JVM which loads additional modules needed for the platform (probably from JDK 8, 2013)
• micro-kernel JVM in JDK8 updates (2013-2014)
• improved out-of-the-box monitoring (based on convergence to the current JRockit Mission Control, then extension to transparency of monitoring); initially rolled into JDK7 in 2012; full JRockit Mission Control convergence in 2013 for JDK8 release - see my November 2011 newsletter for more details on this
• Flight recorder in a JDK8 update, 2013, record and playback JVM operations
• permgen removed from Oracle JVM by JDK8 release (2013) - possibly before as this is targeted for a JDK7 update
• further JVM performance enhancements
• (nearly) deterministic GC - starting with G1 already present in latest JDK6
• cloud awareness and resource management (no date, speculative)
• self-tuning JVM (no date, speculative)
• data types re-vamped (speculative: large arrays, no more primitives, multi-dimensional arrays, ...) JDK10, 2017
• transactional JVM memory (no date, speculative)

Of course we'll be here right through to Java 12, 2021, and beyond, covering all those Java performance improvements and many more, just as we have since 2000. And this month is no different - read on for all our usual links to Java performance tools, news, articles, the extracted tips from all of this month's referenced articles, and a new cartoon from fasterj.com on how to improve performance by reducing application space and time.

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News

Java performance tuning related news.

• JVM 7 Performance Enhancements
• I'm not usually that bothered by "programming trends to watch" articles, but this one has several things that affect performance: More javascript (which likely means more chatty browsers, i.e. your server needs to handle a higher request rate); More connections between systems (slow, needs to be tuned to be less chatty); bandwidth matters (use deltas and compression); energy consumption matters (reduce unnecessary CPU and I/O); accuracy vs scalability and response time is now a performance tradeoff; parallelism needs to be fully utilisable
• Oracle ships JRockit Mission Control 4.1 (will be renamed Java Mission Control at the 5.0 release), supports JDK 7 and Hotspot JDK 1.6
• "Scalability Rules" Book Review

Tools

Java performance tuning related tools.

• Embarcadero J Optimizer profiler
• Intel Guide for Developing Multithreaded Applications
• The Allocation Instrumenter Java agent instruments each allocation; a user-defined callback is invoked on each allocation
• Monitoring classloading using the Java Debug Interface

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Articles

• Practical challenges of profiler integration with Java/J2EE applications (Madhu Tanikella/theserverside)
• List of Known Scalable Architecture Templates (Srinath Perera/srinathsview)
• The Real News is Not that Facebook Serves Up 1 Trillion Pages a Month... (Lori MacVittie/highscalability)
• Top 8 Performance Problems on Top 50 Retail Sites before Black Friday (Andreas Grabner/dynatrace)
• How to launch in a month, scale to a million users (Joseph Perla/jperla)
• Why Concurrency examples are confusing (Peter Lawrey/vanillajava)

Jack Shirazi

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