Robert Casto Software Developer and Performance Engineer

How To

• Java Tips: Optimizing your Map loop | satukubik
  By Nanda Firdausi
  From my tests, I observe that the performance of the first template depends on the backing object. If we are using HashMap, the performance is less or more the same as the second template. If we are using Hashtable, the performance of …

Java

• Java Standard Edition 6 Performance
  Java SE 6 Performance White Paper Javaâ„¢ Platform Performance Engineering Sun … and Performance Enhancements 2.1 Runtime Performance Improvements 2.11 …
• Java SE 6 Update 15
  Security and garbage collection update.
• Java SE 6 Update 16
  Security update.

Posted under Java Virtual Machine, Performance, Sun, Week in Review

Information

• · Glassfish Terracotta Performance?
  By msnuser168
  Then I found the reason is when The threads in SOAP UI exceeed 256. Then some request will fail with “java.net.SocketException:Connection reset”. I am wondering how to configue SUN web server 7 to get better throughput. …. Subject: Re: Glassfish Terracotta Performance? [Up]. ari ophanim. Joined: 05/24/2006 14:23:21. Messages: 629. Location: San Francisco, CA Offline, Not sure I understand this at all. Sorry, but can you explain more about your test and environment? …

• · Java Logger Memory Leaks
  By Aviad
  Code, Performance Add comments. Recently we switched from Log4J to the java.util.logger package (for this entry it will be called the “Java Logger”). Why, you might wonder, and I don’t have a good reason to give other than the illusion …

• · OVERHEAD: Java Application Scalability « Welcome to the Real (IT …
  By Max J. Pucher
  HTTP requests are load-balanced across stateless servers and routed to designated J2EE server for processing. Such Java applications exhibit intratier communication complexity that directly impairs scalable performance. …

• · Java Buzz Forum Java Performance News June 2009
  We list all the latest Java performance related news and articlesIf the comparison is consistent things are due to start picking up again in the first half …

• · What should I look for when improving performance in Java Stack …
  The Java compilers are also pretty good at sniffing for performance improvements probably better than any single human So while there are some obvious …

• · javanet Kirk Pepperdine on Java Performance Tuning
  Kirk Pepperdine talks about Java performance tuning in this java.net Community Corner 2009 podcast, recorded at JavaOne.

• · Introduction to Java Concurrency « Pure Java Performance
  Presented by David Moskowitz to the Sarasota Java Users Group on June 11 2009 … In addition performance improvements are much easier to add to a logically …

• · Java Performance blog: Eclipse Memory Analyzer, 10 useful tips …
  By Markus Kohler
  Java Performance blog. This is my blog about Java performance related topics. Thursday, July 09, 2009. Eclipse Memory Analyzer, 10 useful tips/articles. The Eclipse Memory Analyzer has been shipped with Eclipse 3.5 Galileo and I planned …

• · Editor’s Daily Blog Community Corner Podcast Kirk Pepperdine on …
  In Java Today In Kirk Pepperdine on Java Performance Tuning Kirk Pepperdine talks about Java performance tuning in this

How To

• · Generating Dump Java Data Files
  Watching the Watchers.org – USA
  by panoskrt Recently I have been running some disk I/O benchmarks, among others, with Java. I needed to check I/O operations performance with plain data …

Blog

• · Giju George’s Blog: Performance Monitoring using JMeter
  By gijugeorge
  Apache JMeter is an open source tool that can be used to measure the performance of Java applications. The JMeter can be used to test a wide range of Java applications like web, EJB, web services etc. I am not going to elaborate more on …
  Giju George’s Blog – http://weblogs.java.net/blog/gijugeorge/

Book

• · SQL Server 2008 Query Performance Tuning Distilled | Porwin Ebook …
• By Admin
• Read query execution plans and identify bottlenecks in performance. * Record system performance metrics for trend analysis. * Learn to design databases and write Transact–SQL code to avoid common problems. …

Posted under Java Virtual Machine, Technology, Week in Review

Java SE 6 Update 14 Performance Improvements – One Not Free

Sun has just released Java SE 6 Update 14 with some great performance improvements.

• Optimization Using Escape Analysis : [-XX:+DoEscapeAnalysis]
  HotSpot will look for objects that are created and reference by a single thread and omit allocation treating them like local variables.
• Compressed Object Pointers : [-XX:+UseCompressedOops]
  Improves 64-bit JRE performance by compressing object references to 32 bits when the object heap is less than 32 GB.
• Garbage First (G1) Garbage Collector : [-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC]
  A low pause, server style collector that is more predictable.
• Improved TreeMap Iteration : [-XX:+AggressiveOpts]
  Improved iteration for frequent passes over TreeMaps when the option is turned on.

Release notes indicate though that to use the G1 garbage collector in production, a Java support contract must have been purchased. I guess Oracle is starting to make its mark on Sun.

Posted under Java Virtual Machine, Performance, Sun, Update