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.

]]> http://www.robertcasto.com/2009/08/08/week-in-review-8-august-2009/feed/ 0 http://www.robertcasto.com/2009/07/25/week-in-review-25-july-2009/ http://www.robertcasto.com/2009/07/25/week-in-review-25-july-2009/#comments Sat, 25 Jul 2009 04:26:46 +0000 robert.casto http://www.robertcasto.com/?p=153 Information

• · Performance considerations while working with Strings and …
  By vogella
  Strings are very frequently used in Java programs. This blog post tries to explain what a programmer needs to consider from a performance point of view. It will also explain in what situations you should use StringBuilder instead of …

Tool

• · Groovy’s SQL Switch: A Powerful Tool In The Quest For A Truly Real …
  By Jason Kincaid
  … of the processing costs for the competing technologies below). The new software runs on special Intel boxes, with performance that the company says matches 100 standard SQL servers. For more, you can check out the full product spec sheet here. … Did they have to give it the same name as one of the main dynamic languages for Java? reply · Dan Grossman (@w3roi) – July 23rd, 2009 at 3:19 am PDT. Good to see they’re still going after almost having their code stolen. …

• · Borland Adapts Silk Test Suite For Agile Development
  InformationWeek – Manhasset,NY,USA
  By Charles Babcock Borland has adapted its Silk line of software testing tools to better accommodate modern development methods, particularly Agile-style …

• · java.net: Kirk Pepperdine Interviewed by Janice Heiss
  Janice Heiss interviews Java Champion Kirk Pepperdine about Java performance tuning and more in this java.net Community Corner 2009 podcast, recorded at JavaOne.
• · The Disco Blog » Blog Archive » To recurse or not: Euler challenge #2
  By Andy
  While I implemented problem #1 in Groovy, I thought it would be interesting to solve problem #2 in both Java and Groovy as I wanted to get a good feel for the performance differences between solving Fibonacci via recursion and iteration …
• Architect’s Blog
  By Guy Nirpaz
  New proxy implementation now supports faster fetch times, so that reading objects by their id from local cache is almost as fast as accessing a java.util.ConcurrentHashMap (in Java) or a Dictionary (in .NET). Raw performance of …
• PHP’s Scalability and Performance comparison over Java – Digg model
  By Jiltin
  In addition, many versions of PHP was used in the test, and substantial performance improvements have been made since and are continuing to be made. Here is the article from oreillynet: PHP scales! The word on the street is that “Java …
• Why is Performance Monitoring so hard? – brettdargan.com
  By admin
  Current State – Instantaneous State based; Alerting; Historical Stats; Trace (System > Component > Request) ~ Vertical Profiling through technologies; Profiling – usually technology focused, like Java Profiling; Vital Signs … Production – Under Load Times (batch or interactive); Production – Under Load and component Failures; Dev – Design/Architecture; Dev – Impl time; Test – Environment Issues – ala. Troubleshooting the Integration; Load Test Time; Soak Test Time …
• Amazon Web Services Developer Community Performance Monitoring for …
  Performance Monitoring for Autoscaling. Posted Aug 8 2008 943 AM PDT … As a Java developer I think of JMX which is baked into Java 5 and can be leveraged …

Book

• · AVIRADS-urs always: Java Performance Tuning 2nd edition – Jack Shirazi
  By avirads
  Method profiling can be done by java -Xrunhprof:cpu=samples,thread=y <classname> jhat included in JDK is Java Heap Analysis Tool. The JDK provides two methods for monitoring the amount of memory used by the runtime system. …

Product

• · GigaSpaces’ XAP 7 focuses on performance
  SDTimes.com – San Bruno,CA,USA
  XAP allows Java applications to be provisioned into distributed environments without requiring code changes or separate components for clustering, …

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. …

Tool

• Velocity 09: Fistful of Sand: Monitoring Code Performance at …
  By Dmytro Shteflyuk
  In this talk, we will go over a particular performance monitoring tool we have built. The talk will be liberally dosed with ego-deflating vignettes illustrating our periodic and spectacular mishaps. System Overview. Over the years, we have witnessed many … The Server Side Profiler runs at the same time as the Client Side Profiler, tracing the execution and operating system interaction of the server code as the page is rendered. Below are examples of the data point …

It was a very light week this week.

• Name all the components of a Swing application. Many testing frameworks for Swing use names to identify components. If there are no names provided, it becomes more difficult to make tests that work with the application. The tester must find another way, usually by traversing the object hierarchy, to find a component.
• Make use of an INFO logging level. Tools like Log4J have a number of levels for writing information to files. Writing information useful to testers at this level means they can search logs for the information they are looking for. Success messages, method names, class names, anything that a tester may be looking for can be output in this manner.
• Another useful item that can be output at the INFO level is performance information. Putting this data out in a format that is easily extracted can provide a way to determine where a performance problem is.
• Provide helper and utility classes. These special objects can provide an API to the system that is easier to use and understand. It most likely won’t provide full access to the system’s features, but it will be much easier to use and can give testers an easier time to test the system. If developers are following Agile methods such as test first design, these tests should be made available to the testing team. Granted, these are only useful for people who know how to write code, but frequently the developer becomes the tester on a project and having these special objects can make a tedious job more bearable.
• Interview the test team and find out what problems they run into. Their view of the system is much different than the developer’s and could lead to a solution that is better for everyone. Frequently the things they want which will make their lives easier, turn out to make developers lives easier as well.

• Classpath Hell Just Froze Over – Discussion about project jigsaw and how it will rid Java of of classpath problems.
• A Developers Guide To Load Testing – Slides about load testing by Simon Brown

Tools

• Java for Mac OS X Update Released – A long standing bug has finally been fixed in Java on the Mac OS X platform.

How To

• Building a terabyte-scale data cycle at LinkedIn with Hadoop and Project Voldemort – Lengthy discussion about how to build the system. Great to see how others are architecting systems to solve problems.

• Google Page Speed – Firefox plugin for improving website performance – Tool that uses cache optimization, gzip, and minimizes request times. Can show network activity of webpages.
• Acquiring JVM Runtime Information – Descriptions of tools to get data from running Java processes. jps, jinfo, JConsole, and VisualVM)
• Dealing with multi-partition transactions in a distributed KV solution – Very interested discussion about performance ofl All0partition transactions.
• Java being ported to Qualcomm’s Snapdragon ARM processor – Market will have yet another hardware platform running Java.

Tools

• NEOTYS Announced NeoLoad 3.0 for Stress and Load Testing of Web Applications – Update of tool that can load test web applications including GWT (Google Web Toolkit)
• Total Network Monitor 1.0.1 Released – Network monitoring tool from Softinventive Lab.
• Page Speed Introduced by Google – Firefox Add-on integrated with Firebug that tells you want can be done to improve a download and display for a web page.

How To

• SharePoint Performance, Stress or Load Testing – Discussion about performance testing a SharePoint service. Describes tools and metrics that are helpful.
• Monitoring Performance – Discusses what to monitor in a Windows environment.
• How to install MySQL Monitoring Tools mtop for CenOS Debian – Instructions on how to get the monitoring tool ‘mtop’ installed for MySQL on CentOS Debian.
• JETM – The easy way to monitor your Spring Application – Instructions on how to use JETM to monitor Spring.
• Building Scalable, Complex Apps on App Engine – Session Video by Brett Slatkin that discusses data structures, techniques, and other issues and how to make them scale on the Goggle App Engine.
• Improving page download perception by moving JavaScript to the end – Small article with PHP code that describes how to increase page load perception.
• Unofficial Guide to QuiteTest Professional 10 – Site devoted to helping users with QTP.

Why Performance Test

• Making a case for application performance management by Ann Bednarz – Discusses an Aberdeen Group report about issues with application performance.

Free!

• Eclipse Web Tools Platform: Developing Java Web Applications – Discusses the Test and Performance Tools Platform (TPTP).

• MemoryUp Pro, Memory And Ram Optimizer Reviewed – Review of eMobiStudio‘s MemoryUp application for Symbian-powered smartphones.
• Free LogParser.Email Log Parser Built with VB.NET 2005 – Free application for processing log files written in VB.NET 2005.
• SQL Server 2005 Replication Enhancements – Updates to the replication monitor, pre-computed partitions, updates to unique keys, transactional parallelism, managed replication, and more.
• Apache JMeter 2.3.3 has been updated to version 2.3.3 – Test closedown, HTTP Cookie handling, saving JDBC results, and much more all improved.
• AirMagnet Receives Networking Award for their WiFi Analyzer – Monitors the performance of WiFi networks and assists with problem detection and resolution.
• Review of SQL Server Performance and Monitoring Tools – Lists the tools, how they can be used, and what data is available from each. Nice overview for those wanting to learn what performance monitoring options are available for SQL Server.
• Load Testing an Oracle database with OATS (Oracle Application Test Suite) – Alex Amat discusses how OATS can be used for more than just testing Oracle applications. Very nice article with lots of pictures and source code.
• TaskInfo v9.0 Released by IARSN Company – Replacement for Windows built-in Task Manager. Provides performance analysis graphs of processes, resources, and much more.
• Alchemy Network Monitor 10.1 Released – Inexpensive monitor for detecting network problems.
• JavaOne: Tolls and Utilities for Debugging the JVM – Lists a number of tools including one for visually monitoring garbage collection.
• An IPerf and JPerf Testing Procedure Example – Describes a procedure with these tools to find the performance of a Point to Point connection.
• Everest Ultimate Edition 4.6 Free – Software Updated to Version 5.02 – Windows performance and system information tool including overclocking info, diagnostics, and benchmarking.
• D-Link updates Desktop Widget for monitoring 802.11N Wi-Fi Routers – Widgets for Yahoo!, Vista, and Mac Dashboard updated for monitoring 802.11n Wi-Fi routers

Information

• The speed, size and dependability of programming languages – A great article showing various programming languages and how they relate to each other based on speed, size and dependability
• The Computer Language Benchmarks Game – Programming language measurements.
• Java Software used to monitor performance of LincVolt – How’s that for a cool use of Java technology!
• Performance Tuning is a Dynamic Process – Article discusses Dynamics AX specifically, but is a good read about the the tuning processing and why it is not predictable.
• Tata Communications launches Application Performance Visibility Service – Suite of integrated tiiered service options for monitoring system performance.
• David Holmes on Java Real-Time Systems – Interview by Steve Haines of InformIT Java Reference Guide before the 2009 JavaOne conference.
• Breaking Through JVM Memory Limits – Gil Tene is interviewed about memory issues by Frank Sommers.
• Kirk Pepperdine demonstrates performance pitfalls – Kirk shows why blind performance improvements don’t necessarily result in better system performance. Two examples are given both of which are common pitfalls developers fall into when trying to improve code.
• Larry Ellison says Oracle will pour money into Java – At JavaOne Larry Ellison said they have a huge investment on the technology. He admitted that everything they do that sits above the database is written in Java. They will be investing heavily and are most interested in its continued improvement.
• Tools for Monitoring Synchronization Waits in Java – Nice discussion on the Java Performance Professionals LinkedIn group about how to monitor thread contention and sychronization waits in Java.
• The Trouble with Troubleshooting – Discusses the problem of network monitoring and why tools never quite meet the challenge.

Why Performance Test

• Performance issues cost Simson Confections $3.2 million – Downtime results in lost revenue. Doing proper performance testing can find these problems before they become a boardroom statistic.
• What went wrong with Nokia’s Ovi Store Launch – Yet another example where proper QA and Performance Testing would have avoided launch problems.

Jobs

• Database Administrator in Knoxville TN – Contract positions working on Oracle/SQL Server databases. Requires understanding of performance monitoring and tuning.
• Senior QA Analyst in Chicago Available – Jaffar Sheik’s Resume
• Flex Java – Performance Testing Engineers – Position in Central London
• Oracle Data Analyst in Chicago, IL – Senior Data Architect and Data Modeler needed who understands performance tuning and trading or financial exchange systems.

Miscellaneous

• Benchmark Your Browser – Tool that runs tests to determine how well various browsers run on your system. Figure out which one is the fastest for you.

Books

• High Performance Web Sites: Essential Knowledge for Front-End Engineers
• Even Faster Web Sites: Performance Best Practices for Web Developers

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.