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Abstract. 4. USCGrid User: Southern California Earthquake Center .
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4. USCGrid User: Southern California Earthquake Center
USC Information Services Division (ISD) provides various information technologies for the University community. In conjunction with USC High Performance Computing Center (HPCC) and Information Sciences Institute (ISI), the emerging technology group within ISD has created and maintains USCGrid, a production installation of the Globus Toolkit and related Grid software components including GPT, Condor-G, KX.509, and Ganglia with an extension integrating it with the Globus Toolkit.
USCGrid has been in operation since July 2002. It has been used by earthquake engineers to run computationally intensive physics-based earthquake simulations. The integration of the Globus Toolkit and other grid software with USC campus IT infrastructure makes it possible for users (e.g. geophysicists) to easily and seamlessly submit their jobs to the USCGrid computing facilities, and soon other Grids (e.g. Teragrid) in the future.
KNOWLEDGE REPRESENTATION & REASONING
Knowledge base access, Inference
Syntactic & semantic translation
The Southern California Earthquake Center (SCEC), headquartered at the University of Southern California, is a regionally focused organization with a mission to gather new information about earthquakes in Southern California and integrate that knowledge into a comprehensive and predictive understanding of earthquake phenomena.
Relations & constraints
Models of simulation codes
With recent advances in geophysics, SCEC has embarked on an ambitious program to develop physics-based models of earthquake processes and integrate these models into a new scientific framework for seismic hazard analysis and risk management. To achieve these objectives, the environment must provide a means for describing, configuring, instantiating, and executing complex computational pathways that result from the composition of various earthquake simulation models.
Grid technologies, as part of SCEC-ITR multidisciplinary collaboration, will enable SCEC researchers access to distributed simulation codes and resources for the timely execution of simulation scenarios, specifically by integrating high-performance computing resources into the execution environment. The USCGrid, as a part of a shared computational testbed for SCEC applications, has been successfully used to calculate synthetic seismograms using anelastic wave-propagation simulation.
Data & Simulation
Policy, Data ingest, Repository access
Compute & storage management, Security
USC ISD provides the University community with information technology support in the area of networking, library services, academic computing and telecommunications. ISD is always in search for, experimenting with and maintaining state-of-the-art emerging technologies that can be used to facilitate users’ operations on its maintained computing and storage resources. Recent advances in grid technologies enable the ability to pull geographically distributed resources into a single integrated computation. In addition, grid technologies can be used to facilitate multi-organization collaborative effort which we envision will be common in the future. Therefore, in conjunction with USC High Performance Computing Center (HPCC) and Information Sciences Institute (ISI), the emerging technology group within ISD has created and maintained USCGrid, a production installation of the Globus Tooklit and other Grid-related software components.
5. SCEC Execution Environment: Physics-based Wave Propagation Simulation
The current execution environment involves a user (e.g. a SCEC scientist) submitting a job request to a job submission manager on his or her unix workstation at USC. In the future, this request can be made by a workflow manager which given an input computational pathway instantiation, automatically generates an execution plan (e.g. a sequence of execution steps) and submits it to the testbed.
Faults Motions StressesAnelastic model
AWM = Anelastic Wave Model
SRM = Site Response Model
it is used for user authentication in order to access grid services
This figure shows how we may obtain a wave simulation via the testbed. Here, a SCEC scientist (almaak.usc.edu) will request wave propagation code (Olsen, 2001) to be run on a USCGrid machine (hpc.usc.edu).
(1) Create user’s
proxy certificate v
Pathway 2: Ground motion simulation (physics-based simulations)
(2) Submit requests
A SCEC scientist
(5) User plots the wave
(5) User runs visualization
tool on the output
2. USCGrid Software Suites
(4) Submit request
for file transfer
(3) Jobs are submitted
to remote servers
6. Future Plan
(3.1) Jobs are submitted
to local scheduler
3. USCGrid Testbed
(4.1) Output files
Are transferred to
USC ISD emerging technology group is working to maintain and extend the Globus-Toolkit-based USCGrid as fully operational and production-grade. The Grid software components have been integrated with campus IT infrastructure to provide seamless services to the user community. In addition, the group is preparing to connect the USCGrid to other universities, research institutions, and Grid based projects that are also using the Globus Toolkit to create an even larger computational and data grid.
Regarding the cross-organization Grid interoperability, ISD emerging technology group has started the process of defining trust relationships and a broadly acceptable PKI certificate Policy for its KCA and KX.509 installation. This mission will enable members of the USCGrid to exploit computing resources around the world. It will also facilitate collaborative research involving extensive computing resources owned and maintained by different administrative organizations. Support for cross certification with the DOE Science Grid, NPACI, and another prominent southern California based university is underway.
Job submission manager
(condor-G, Globus client)
Grid services by theGlobus Toolkit
(3.2) Jobs get executed
USCGrid testbed consists of the following high performance and high throughput computing facilities:
David Okaya (USC),
Kim Olsen (UCSB)
Garrick Staples (ISD at USC)
Note: GRAM, GridFTP, MDS are provided by the Globus Toolkit. Grid Security Infrastructure (GSI) for user/resource authentication and authorization are implemented by all Globus components.
Volume Rendering: Cross-Eye Stereo Pairs
P-wave velocity of rocks within volume (0-8131.3 meters/sec)
Focus on a point in front of this stereo pair.
Shelley Henderson*, Hongsuda Tangmunarunkit**, John Mcgee**
*Center for High Performance Computing and Communication, USC, ** Center for Grid Technologies, USC/ISI
http://www.usc.edu/isd/services/uscgridThe USC High Performance Computing Center’s Infrastructure for Earthquake Engineer Research using the Globus Toolkit