Science Portal for the Spallation Neutron Source (SNS) - PowerPoint PPT Presentation

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Science Portal for the Spallation Neutron Source (SNS)

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Data, acquisition, analysis, simulation, and visualization ... Portal is a common 'gateway' to a complex set of services: Software analysis tools and ... – PowerPoint PPT presentation

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Title: Science Portal for the Spallation Neutron Source (SNS)


1
Science Portal for theSpallation Neutron Source
(SNS)
  • James Kohl, Sudharshan Vazhkudai,
  • Steve Miller, and Al Geist
  • Scientific Computing Group

2
Science PortalOne-stop shopping at SNS
  • SNS manages
  • Multiple instruments, multiple users (2000/year)
  • Multiple services
  • Data, acquisition, analysis, simulation, and
    visualization
  • Portal is a common gateway to a complex set of
    services
  • Software analysis tools and applications for
    neutron science data
  • Instruments and data acquisition
  • Data repositories, file systems, and archives
  • Databases with metadata and provenance
  • High-performance computing resources analysis
    and simulation
  • Collaborative services interactive information
    sharing
  • Several access modes web-based,
    desktop-applications
  • Zero user cost Just a web browser, no
    client-side installation!

Multiple instruments, multiple users (2000/year)
Multiple services
Data, acquisition, analysis, simulation, and
visualization
Portal is a common gateway
acquisition
Data
metadata
computing
Zero user cost
3
SNS software overview Interfaces provide
extensibility and integration they dont tie
users to one framework
Software users run on their own computers using
data downloaded from SNS
SNS defines interfaces through which user desktop
programs can access SNS resources
Desktop Client
User Application
Web Browser
Users and SNS write components to well-defined
standard interfaces
Security Interface
Access and Authorization Control
Function Interface
Control Portal
Data Portal
Analysis Portal
z
Acquisition
SNS Validated Software
New User Code
Legacy Code
Commercial Packages
Data Management
Data Interface
Database and Flat File Access Protocols
Computer Interface
Meta Data
Documentation
Analysis Results
Data
Publications
4
Backend SNS software architecture (interface
specification/dependencies)
Acquisition
Analysis/Viz
Data Management
5
Combining facility and community toolsthrough
the SNS Portal
SNS Portal
  • Facility tools newly developed or modules
    tightly integrated into the portal
  • Community tools existing monolithic or
    commercial/independent software
  • Java applet-based X-emulation and forwarding
    (using WiredX/WeeerdX)
  • Application executes on portal server
    backend/clusters and feeds into SNS data
    management
  • No installation on user desktop
  • Rootless window executions
  • Looks and feels like local
  • Capitalize and combine existing
    and evolving neutron science
    analysis tools

Facility
Community
SNS View
ISAW
6
Data management hierarchy
/facility
/instrument
/ExperimentID
/experiment
/nexus_files
/extra_metadata
/submitted_analysis
ICAT metadata catalog Oracle DB
/shared
/facility
/users
/john
/workspace (read/write)
/ExperimentID (read only)
/ExperimentID (read only)
/public (read only)
/public
/ExperimentID
(Nightly update of /public)
/ExperimentID
Workspaces created/updated when proposal
accepted Group permissions enforce facility
authorization policy
(Note Grayed names are symbolic links within the
data hierarchy.)
7
Application managementFor staging, execution and
monitoring/access
The application manager realizes the
abstract data analysis pipeline specified by the
user
  • Converts logical pipeline definition into
    functional scripts
  • Coordinates scheduling, data staging, execution
    monitoring
  • Interfaces to both facility and community
    software tools

8
SNS visualization architecture
revealed
9
Browsing CD-4 data with SNS portal
10
Security/authentication using XCAMS
  • Portal authentication tied into ORNL XCAMS user
    authentication system, via ClearTrust
  • Authenticated users are authorized to access
    resources
  • Data management
  • Metadata/databases
  • Experiment proposals
  • High-performance Computing (HPC)
    systems/computing
  • All portal transactions pass through
    authentication layer
  • Future direction
  • Support X.509 credentials to access other HPC
    resources

11
SNS science portal summary
  • Secure access to key services
  • Acquisition, analysis, simulation, visualization
  • Data repositories, file systems, and archives
  • Metadata and provenance databases
  • High-performance computing resources
  • Software analysis tools for neutron science
  • Web-based and programmatic desktop access
  • Integration of facility and community tools
  • Extensible software architecture
  • Powerful data and application management

12
Contact
Stephen D. Miller Scientific Computing Group
Spallation Neutron Source (865)
241-1886 millersd_at_ornl.gov


12 Kohl_SNS_0611
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