Abstract
The 2006 Eurographics Symposium on Parallel Graphics and Visualization took place at Universidade do Minho, Barga, Portugal. There were a total of 47 registered participants which represents a significant increase in the number of attendees compared to previous editions of the event. The goal was to enable people to attend all events in an attempt to answer a reciprocal interest on research works. It was believed that by organizing related events in the same geographical area it is able to attract more participants for each events. The first keynote was on Rendering on Demand by Alan Chalmers from the University of Bristol. The second keynote was devoted entirely to commodity visualization clusters and many other papers generated results using clusters.

Abstract
Parallelizing rendering algorithms to exploit multiprocessor and multicore machines isn't straightforward. Certain methods require frequent synchronization among threads to obtain benefits similar to the sequential algorithm. One such algorithm is the irradiance cache (IC), an acceleration data structure that caches indirect diffuse irradiance values. In multicore systems, the threads must share the IC to achieve high efficiency. A proposed wait-free mechanism for accessing the shared IC doesn't use the common blocking or busy-waiting methods, thus avoiding most serialization and reducing contention. A comparison with two classic approachesa lock-based mechanism and a local-write techniqueon two systems with up to 24 cores shows that the wait-free approach significantly reduces synchronization overhead, thus improving performance. The Web extra PDF augments the article. The Web extra video is an animation that demonstrates the wait-free IC system running at close to interactive rates on an 8-core machine. © 2006 IEEE.

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