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Simulation Of Binary Stars: A Testbed For Grid Computing
Paris (ESA) Nov 18, 2004 A GASS simulation of Gaia telemetry, corresponding to five years of observations of 1000 astrometric binary stars, has been successfully completed using the GaiaGrid environment. The Astrometric Binary Star Analysis is one of the shell algorithms selected to be run in the GaiaGrid environment. In order to test this algorithm realistic simulations of telemetry, covering five years of Gaia observations, for about 1000 astrometric binary stars needed to be generated and then ingested into the GDAAS system. The generation of simulated data in the context of the Gaia mission is under the responsibility of the Gaia Simulation Working Group. The GASS simulator generates realistic telemetry which can be ingested into GDAAS and used to populate the test databases. In spite of the relatively small number of objects in the astrometric binary star simulation, the generation of the telemetry requires a non-negligible computational effort because several aspects of the simulation are not related to the number of objects but rather to the simulated time span. GASS was deployed in the GaiaGrid environment in order to exploit the computational power it provides. In the case of GASS this deployment is particularly effective because the design of the simulation allows it to be completely split into several smaller pieces that can be simultaneously sent to different nodes of GaiaGrid, taking full advantage of the distributed computing environment provided. The simulations were run in GaiaGrid using the Gridassist workflow tool during a week in October 2004. After some initial testing and fine-tuning, 183 independent jobs were launched to the GaiaGrid environment, covering the full period of five years of simulation. These jobs were automatically distributed to the GaiaGrid nodes by Gridassist and the results were collected in a central repository located at CESCA, accessible through the Grid. In summary:
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iPod Dominance A Mirage
Chicago (UPI) Jan 09, 2006Though Apple Computer has reported remarkable success with its iPod - sales rose by 250 percent during the last fiscal year - there is some competition coming this week for the developer of the world's most famous, legitimate music downloading network, experts tell United Press International's Networking. |
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