At the 7th Annual Global LambdaGrid Workshop held in Prague, the Global Lambda Visualization Facility (GLVF), an international team of computer
and application scientists, announced the results of a distributed pixel streaming experiment using the new Visualcasting feature of SAGE, the Scalable Adaptive
Graphics Environment. SAGE is being developed as part of the NSF-funded OptIPuter project.
SAGE enables individual sites to generate visualizations and animations using in-house specialized and/or proprietary hardware and software, and then send streams
of pixel information to a partner site so collaborators can see the results. Visualcasting extends this capability to multiple networked users by replicating the
streams to multiple sites simultaneously, enabling partners to collaboratively work in a shared session.
For this experiment, multi-gigabit, high-resolution scientific visualizations were streamed from data stores at Calit2 in San Diego and at StarLight in Chicago to
tiled display walls at EVL (Chicago), SARA (Amsterdam) and Masaryk University (Czech Republic). Two different animations were streamed; one was sent to four
locations, and the other was sent to two locations. Each endpoint ran SAGE to send and/or receive the real-time streams.
The ultra-high-resolution NCSA Milky Way galaxy animation, stored on disk at Calit2 in San Diego, was streamed at 1Gbps to StarLight in Chicago. There, a SAGE
Bridge cluster replicated the streams, sending 1Gbps to each of the four GLVF partner sites for simultaneous viewing. A second animation, NCSA’s Tornado, stored
at the StarLight facility, was streamed to nearby EVL, where another SAGE Bridge cluster replicated the information to two of the four sites.
This SAGE visualcasting experiment was conducted prior to the GLIF 2007 meeting, on September 12-13, 2007.
Special thanks to StarLight, National LambdaRail, I-WIRE, CESNET, CineGrid, and GLIF
Fig. 1. SAGE visualcasting of ultra-high-resolution digital content to tiled displays at EVL in Chicago (upper and lower left images),
SARA in Amsterdam (upper right image) and Masaryk University in the Czech Republic (lower right image). The distributed pixel streaming experiment
was conducted September 12-13, 2007. Image compiled by Luc Renambot, EVL/UIC. Content courtesy of NCSA/UIUC.
Electronic Visualization Laboratory, University of Illinois at Chicago
Calit2/University of California, San Diego