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Java, MySql increased performance with Huge Pages

[Resources updates: 2010.07.07 , 2009.11.03 , 2009.05.27 ] Long running, large memory, high performant applications often have special needs with respect to their memory management. On Linux, Solaris and other modern OSes, the translation look-aside buffer ( TLB ) - whose page size of 4k for many CPUs/OSes - becomes a scalability issue in these extreme conditions. In order to get around TLB scalability issues, huge page sizes are used to reduce the impact on performance. This can be of use to installations with large scale Java, MySql and other large memory applications. 300% improvement : " Well, in my case, I was able to achieve an over 3x improvement in my EJB 3 application, of which fully 60 to 70% of that was due to using large page memory with a 3.5GB heap. Now, a 3.5GB heap without the large memory pages didn't provide any benefit over smaller heaps without large pages. Besides the throughput improvements, I also noticed that GC frequency was cut down by two-third...
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Lucene concurrent search performance with 1,2,4,8 IndexReaders

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My last Lucene evaluation ( Simultaneous (Threaded) Query Lucene Performance ) from a couple of days ago was looking at concurrent (multithreaded) queries using a single IndexReader across all threads. Due to suggestions/demand from the Lucene User mailing list, I have expanded the evaluation to include multiple IndexReaders . It is known that a single IndexReader is a limiting factor in a multithreaded environment. So I decided to run the same tests with 1,2,4 and 8 IndexReaders (actually I create IndexReaders and then create an IndexSearcher from each of these and share the IndexSearchers). Below are the results. All of the test environment are the same as my previous evaluation, except: It goes up to 8192 threads instead of the original 4096 threads I had to pass in to the Java VM: -Xmx4000m because the VM was running out of heap for 8 readers I've made the graph larger (Click on graphic to see results) As you can see, 2,4 and 8 readers significantly improve query rate over a...
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IBM on Linux: "Lean, clean, and green"

IBM developerWorks has an article ( Linux: Lean, clean, and green: How GNU/Linux is becoming more eco-friendly - 26 May 2009) which examines some of the Green benefits of the Linux operating system. It focuses primarily on the low resource demands Linux has on systems (as well as its support for older systems), thus extending the life of machines that would otherwise be junked. Also discussed is virtualization and aspects of the Linux OS that reduce power consumption in servers. Additional Green Linux and Open Source resource: LessWatts.org - Saving Power on Intel systems with Linux Ten ways Linux can turn you green . 2009 Green Computing With Open Source Software . 2009 Open Source is Already Naturally Green: Fewer Lawyers, Fewer Showers, More Real People Add Up to Big Green Wins . 2009 Is Linux the Greenest Operating System . 2009 Go Green, Save Green with Linux . 2008 Linux captures the 'green' flag, beats Windows 2008 power-saving measures 2008 Canadian Green Party...
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