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New and Cool

New and Cool. The Cactus Team Albert Einstein Institute cactus@cactuscode.org. Active Development. Topics: Remote Visualization Remote Steering Remote Offline Visualization Simulation Portal Collaboratory Tools And others ... Groups:

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New and Cool

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  1. New and Cool The Cactus Team Albert Einstein Institute cactus@cactuscode.org

  2. Active Development • Topics: • Remote Visualization • Remote Steering • Remote Offline Visualization • Simulation Portal • Collaboratory Tools • And others ... • Groups: • German DFN-Verein Gigabit project for exploiting high speed networks (TIKSL) • USA NSF KDI project to develop collaboratory tools for astrophysics around Cactus (ASC) • And others ...

  3. Remote Visualization OpenDX OpenDX Amira Contourplots (download) LCAVision IsoSurfaces and Geodesics Grid FunctionsStreaming HDF5 Amira

  4. Remote Visualization • Streaming data from Cactus simulation to viz client • Clients: OpenDX, Amira, LCA Vision, ... • Protocols • Proprietary: • Isosurfaces, geodesics • HTTP: • Parameters, xgraph data, JPegs • Streaming HDF5: • HDF5 provides downsampling and hyperslabbing • all above data, and all possible HDF5 data (e.g. 2D/3D) • two different technologies • Streaming Virtual File Driver (I/O rerouted over network stream) • XML-wrapper (HDF5 calls wrapped and translated into XML)

  5. Remote Visualization (2) • Clients • Proprietary: • Amira • HTTP: • Any browser (+ xgraph helper application) • HDF5: • Any HDF5 aware application • h5dump • Amira • OpenDX • LCA Vision (soon) • XML: • Any XML aware application • Perl/Tk GUI • Future browsers (need XSL-Stylesheets)

  6. Open source, (free), multiplatform, large active development community, easy to program Reads HDF5 (Cactus) data from file or remotely streamed from Cactus Simple GUI, select different hyperslabs from 3D data Also support for streamed ASCII data from Cactus OpenDX

  7. Remote Visualization - Issues • Parallel streaming • Cactus can do this, but readers not yet available on the client side • Handling of port numbers • clients currently have no method for finding the port number that Cactus is using for streaming • development of external meta-data server needed (ASC/TIKSL) • Generic protocols • Data server • Cactus should pass data to a separate server that will handle multiple clients without interfering with simulation • TIKSL provides middleware (streaming HDF5) to implement this • Output parameters for each client

  8. Remote Steering Any Viz Client HTTP XML Remote Viz data HDF5 Amira Remote Viz data

  9. Remote Steering • Stream parameters from Cactus simulation to remote client, which changes parameters (GUI, command line, viz tool), and streams them back to Cactus where they change the state of the simulation. • Cactus has a special STEERABLE tag for parameters, indicating it makes sense to change them during a simulation, and there is support for them to be changed. • Example: IO parameters, frequency, fields • Current protocols: • XML (HDF5) to standalone GUI • HDF5 to viz tools (Amira) • HTTP to Web browser (HTML forms)

  10. Thorn which allows simulation to act as a web server Connect to simulation from any browser Monitor run: parameters, basic visualization, ... Change steerable parameters See running example at www.CactusCode.org Wireless remote viz, monitoring and steering Thorn http

  11. Remote Steering - Issues • Same kinds of problems as remote visualization • generic protocols • handling of port numbers • broadcasting of active Cactus simulations • Security • Logins • Who can change parameters? • Lots of issues still to resolve ...

  12. Viz Client (Amira) HDF5VFD DataGrid (Globus) HTTP DPSS FTP Web Server FTP Server DPSS Server Remote Offline Visualization Viz in Berlin VisualizationClient Downsampling, hyperslabs Only what is needed Remote Data Server 4TB at NCSA

  13. Remote Offline Visualization • Accessing remote data for local visualization • Should allow downsampling, hyperslabbing, etc. • Access via DPSS is working (TIKSL) • Waiting for DataGrid support for HTTP and FTP to remove dependency on the DPSS file systems.

  14. Grand Picture Viz of data from previous simulations in SF café Remote steering and monitoring from airport Remote Viz in St Louis Remote Viz and steering from Berlin DataGrid/DPSS Downsampling IsoSurfaces http HDF5 T3E: Garching Origin: NCSA Globus Simulations launched from Cactus Portal Grid enabled Cactus runs on distributed machines

  15. More Information • Web pages: • Cactus: • http://www.CactusCode.org • DFN: • http://www.zib.de/Visual/projects/TIKSL • ASC: • http://wugrav.wustl.edu/ASC/mainframe.html • Contact: • cactus@cactuscode.org

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