The Holy Java

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Most interesting links of May

Posted by Jakub Holý on June 2, 2010

The most interesting stuff I’ve read in May, in no particular order. You can easily guess I’ve been working on performance troubleshooting this month🙂

  • NoSQL is About… – all the things NoSql databases are said to be about (and perhaps are not) and a good overview of the different goals and thus also features of the various implementations
  • Bulletproof of Mind Mapping: Overview, Benefits, Tips and Tools – the article not only introduces mind maps (a structured way of recording ideas, much less limited than lists) but also describes over 30 desktop and web-based MM tools, both free and commercial (some of the descriptions come from the SW’s web, some from the author – the distinction isn’t clear)
  • Java vs. C Performance….Again. (9/2009) – When C(++) is better than Java, when Java is more appropriate, and common flaws in comparions methodologies/false arguments.
  • Why Learning Git is really, really hard part 1 and part 2 with actual reasons – because it doesn’t care enough for usability (unusual commands, cryptic error messages, impossibly to go to a “simpler use mode”). I’m intrigued by distributed SCM systems and tired of not-so-easy branching & merging in SVN and its lovely problems with corrupted metadata (when you delete a folder…) and thus I was considering switching to Git that everybody is so excited about. I still plan that but these articles warned me that it may be not so painless and easy. A good read.
  • Java VisualVM Blogging Contest results – the best posts –
    • VisualVM – tool for profiling Java applications – nice, short intro with many pictures
    • Analyzing Memory Leak in Java Applications using VisualVM
    • (and others … )
  • How to compute running mean/standard deviation –  this page explains and in C implements an algorithm for computing a running estimate of mean and standard deviation, which minimizes accumulation of precision errors. A running estimation has the advantage that you do not need to store all the numbers and is thus suitable e.g. for continuous performance monitoring with a low memory overhead (buth the performance overhead of a division and multiplication it introduces is perhaps also something to consider – though for most application it’s negligible)
  • (Java) Web performance in seven steps – a great article about the “management of performance” of a Web/JEE application from the definition of performance requirements up to continual performance monitoring with interesting war stories and links to various useful tools. I can sign the author’s maxim “measure, don’t guess!”. The Java monitoring API Java Simon mentioned in the article is worth a look.

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