Wednesday Dec 05, 2012

Parallel Classloading Revisited: Fully Concurrent Loading

Java 7 introduced support for parallel classloading by adding to each class loader a ConcurrentHashMap, referenced through a new field, parallelLockMap. This contains a mapping from class names to Objects to use as a classloading lock for that class name. This scheme has a number of inefficiencies. To address this we propose the notion of a fully concurrent classloader.[Read More]

Wednesday Mar 30, 2011

To Blog or Not to Blog

Okay this is a placeholder entry to force my older blog entries to migrate to the new blog system.

Wednesday Jan 13, 2010

Minimize Garbage Generation: GC is your Friend, not your Servant

Automatic memory management, a.k.a Garbage Collection, is one of the main benefits of a managed object-oriented language like Java. But in many ways its presence has made us lazy and sloppy: we don't care about generating garbage because "objects are cheap" and "the GC can clean it up easily". There is some truth in that, but it isn't a universal constant! Not all GCs are the same and sloppy habits can come back to haunt you in a real-time environment.[Read More]

Monday Sep 14, 2009

Real-time Java at OOPSLA 2009

Come and join us at OOPSLA 2009[Read More]

Monday Sep 08, 2008

Real-time Java at OOPSLA 2008

The OOPSLA Chair would like to extend this invitation to join me at OOPSLA 2008 ...[Read More]

Tuesday Apr 15, 2008

Roll up! Roll up! It's JavaOne time again and Real-Time is hitting the Big Time

It's only a few short weeks until JavaOne 2008 and real-time features prominently in this years conference.

If you can't make JavaOne this year, the hands-on labs will be available for download after the event through Sun Developer Network - look for Lab 7420. [Read More]

Thursday Jan 31, 2008

Priorities, Scheduling and Real-time

With the early access release of Sun's Java Real-time System on Linux now available, it seems a suitable time to discuss priority scheduling in real-time systems and how things differ between the Solaris and Linux platforms.[Read More]

Monday Oct 02, 2006

Inside the Hotspot VM: Clocks, Timers and Scheduling Events - Part I - Windows

This blog introduces the issues surrounding the use of clocks and timers in Java with the Hotspot VM (using JDK 5 as a reference point), with a focus on issues in the Windows operating system. There may be a Part II at some stage to discuss Solaris and Linux - which have similar problems on x86 hardware.[Read More]
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The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.

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