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Vashra-T: Grid Ray Tracing for the Fusion Physics ASTRA Code

Vashra-T: Grid Ray Tracing for the Fusion Physics ASTRA Code. J.L. Vázquez-Poletti (UCM) E. Huedo (UCM) R.S. Montero (UCM) I.M. Llorente (UCM). D. López-Bruna (CIEMAT) A. Cappa (CIEMAT) F. Castejón (CIEMAT) A.J. Rubio-Montero (CIEMAT). 4th EGEE User Forum (Catania). The ASTRA Code.

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Vashra-T: Grid Ray Tracing for the Fusion Physics ASTRA Code

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  1. Vashra-T: Grid Ray Tracing for the Fusion Physics ASTRA Code J.L. Vázquez-Poletti (UCM) E. Huedo (UCM) R.S. Montero (UCM) I.M. Llorente (UCM) D. López-Bruna (CIEMAT) A. Cappa (CIEMAT) F. Castejón (CIEMAT) A.J. Rubio-Montero (CIEMAT) 4th EGEE User Forum (Catania)

  2. The ASTRA Code • Solves transport equations in magnetic fusion plasmas (Simulate the Displacements of particles and energy): • Reduce transport  Improve confinement  Make reactors cheaper • Puts together models for transport, sinks and sources: Simulates a plasma discharge • Improve plasma heating methods for a commercial reactor version! • Now being executed on a shared memory machine • Difficult to scale • Idea: Separated modules executed onto the Grid • Increasing parallelism ASTRA (Hindu mythology) • Supernatural artifact • Presided over by specific Deity

  3. Vashra-T Vajra (Hindu Mythology) • Thunderbolt Astra from Indra Deity Vashra (Fusion Physics on Grid) • Each module invoked by ASTRA (transport coeff., sources, heating,…) • Vashra-T • Traces each ray contained in the simulation of a microwave beam which heats fusion plasma (Truba code) • The properties of heating depend on the EVOLVING PLASMA: Interplay between transport and heating. A large number of rays to be run: Needs to be executed as much as possible in less time • Fusion Physics (Fusion VO) – Proposed by CIEMAT (Spain) • Parameter Sweep (with pre and postprocess) • 1 ray = 1 job = 3’ on a Pentium 4

  4. GT4 gLite gLite System Architecture • Local Machine • SGI ALTIX 3700 • 64 + 128 CPUs 64 bits • LSF • Local Communications • scp and ssh • User ssh keys exported • Grid machine • Globus Toolkit 4 • Globus GridWay 4.2.1 • Access to 30 sites

  5. Results Plasma (n, T)  Heating properties  Plasma Evolution  Heating properties  Evolution … • Heating estimated by the grid every 1 ms • Study of next ASTRA extensions to be gridified • Evolution estimated by ASTRA. • TRUBA results change.

  6. Results • Results at t=100 and t= 120 ms • The Heating is much more centred!!!

  7. Achievements and Future Work • Walltime improvement • Before Vashra-T: 40.5 hours (profile with 97 rays/beam) • With Vashra-T: 2.5 hours (same profile) • Module idea works! • Study of next ASTRA extensions to be gridified • FAFNER: MC Code for Plasma Heating • EIRENE: particle source code • …

  8. Grazie mille! Wait… want to see Vashra-T in action?

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