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  • Memory Barriers and JVM Concurrency

    by Dennis Byrne on  Mar 08, 2010 2

    Memory barriers, or fences, are a set of processor instructions used to apply ordering limitations on memory operations. This article explains the impact memory barriers have on the determinism of multi-threaded programs. We'll look at how memory barriers relate to JVM concurrency constructs such as volatile, synchronized and atomic conditionals.

  • Service Dynamics: the lazy man's way

    by Todor Boev on  Jul 29, 2009 2

    This article describes "the hardest topic in OSGi, how to deal with service dynamics," based on personal experience. Two factors, concurrency and direct service references, make the problem "fiendishly hard." An import and an export policy should form a comprehensive doctrine for dealing with service dynamics and the article explores two export policies with their corresponding doctrines.

  • Ruby's Roots: Smalltalk Comeback and Randal Schwartz on Smalltalk

    by Werner Schuster on  Oct 27, 2008 5

    Smalltalk, a language that has had a big influence on Ruby, is making a comeback. We take a look at the current situation and talk to Randal L. Schwartz about Smalltalk.

More Than Just Spin (Up) : Virtualization for the Enterprise and SaaS

Posted by Matthew Porter on  Aug 31, 2008

Cloud services have helped bring virtualization to the forefront. Its full power however, also includes other benefits such as high availability, disaster recovery, and rapid provisioning. 1

Using Ruby Fibers for Async I/O: NeverBlock and Revactor

Posted by Werner Schuster on  Aug 28, 2008

Ruby 1.9's Fibers and non-blocking I/O are getting more attention - we talked to Mohammad A. Ali of the NeverBlock project and Tony Arcieri of the Revactor project. 1

Exploring LISP on the JVM

Posted by Per Jacobsson on  Jul 10, 2008

One of the most exciting things in Java right now is the work being done to get other programming languages onto the JVM. If you want to try something very different from Java, Lisp is a great option. 12

Do Java 6 threading optimizations actually work? - Part II

Posted by Jeroen Borgers on  Jun 27, 2008

Jeroen Borgers examines if biased locking, lock coarsening, lock elision by escape analysis and adaptive spin locking techniques in the latest JVMs actually work in highly-concurrent apps. 3

Do Java 6 threading optimizations actually work?

Posted by Jeroen Borgers on  Jun 18, 2008

Jeroen Borgers examines if biased locking, lock coarsening, lock elision by escape analysis and adaptive spin locking techniques in the latest JVMs actually work in highly-concurrent apps. 16

A Look at Ruby Debuggers

Posted by Werner Schuster on  Apr 19, 2008

"Ruby has no debugger" - this misconception has stuck around for ages. Time to eradicate it: Ruby does indeed have powerful debugging support. We look at what's available for all Ruby implementations.

Real-Time Java for the Enterprise

Posted by Simon Ritter on  Mar 10, 2008

Simon Ritter explains the vision and capabilities of the Real-Time Java specification (RTSJ), which will bring guaranteed response times regardless of GC. 3

The Box: A Shortcut to finding Performance Bottlenecks

Posted by Kirk Pepperdine on  Sep 21, 2007

Finding performance bottlenecks can be a difficult task and it can get more difficult as our applications grow in size. The Box is a methodology tool that focuses us efforts to improve performance. 6

Introduction to OpenTerracotta

Posted by Orion Letizi on  Feb 12, 2007

Orion Letizi goes in-depth on OpenTerracotta, an open-source JVM-level clustering solution that can cluster single-jvm apps with no code changes. 10

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