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MDSplus. Tom Fredian MIT Plasma Science and Fusion Center. What is MDSplus?. Data Acquisition System Remote Data Access System Data Visualization and Analysis System Data available via fortan, c, c++, java, idl,matlab, visual basic, labview, php, python Data Archival System. History.

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mdsplus

MDSplus

Tom Fredian

MIT Plasma Science and Fusion Center

what is mdsplus
What is MDSplus?
  • Data Acquisition System
  • Remote Data Access System
  • Data Visualization and Analysis System
    • Data available via fortan, c, c++, java, idl,matlab, visual basic, labview, php, python
  • Data Archival System
history
History
  • Designed and developed for use on Alcator C-Mod, RFX and ZTH between 1987-1991 to run on OpenVMS platform
  • Remote data access from wide variety of platforms added 1994
  • Ported to Unix/Windows 1999
  • Added Globus Security Infrastructure 2002
    • Based on X.509 identity certificates
mdsplus worldwide
MDSplus Worldwide
  • MDSplus currently installed at over 30 experiments, fusion laboratories and universities.
  • Most widely used tool for accessing fusion related data.
  • Over 3000 downloads of the MDSplus software.
mdsplus1
MDSplus
  • Data Acquisition
    • MDSplus typically used in “pulse” mode
    • DAQ Device support developed as needed
  • Remote data access
    • Simple efficient data access on the LAN
    • Secure authenticated data access on the WAN
  • Visualization Tools
    • dwscope & jScope
    • IDL, MATLAB, python, PHP interfaces (and more)
data storage
Data Storage
  • The information about each pulse is stored in a hierarchical structure.
    • Diagnostic / Data analysis setup
    • Machine Control
    • Task scheduling
    • Raw and Analyzed results
    • Calibration information
  • Data longevity
    • All of the data from a diagnostic is stored in an organized way.
    • This provides a mechanism for the data from a diagnostic to be self descriptive.
  • One set of tools can be used to operate on both data and setup information.
  • Concurrent multi-user read and write
traverser
Traverser

Icons for

Node usage

Expandable

Node

Right button

popup menu

Command

Window

complex data types
Complex Data types
  • In addition to a wide selection of primitive data types (byte, word, long, float, double, complex, etc...) MDSPlus supports data types to store commonly used combinations of items.
    • Signal (scaled data, raw data, dimension_0 [,dimension_1 …])
    • Subscripting both arrays and signals
    • With_units(item, units)
    • Range - start : end : increment
    • Action(dispatch, task)
    • Dispatch(1, ident, phase, when, notify)
    • etc…
homogeneous data access interface
Homogeneous Data Access Interface
  • MdsConnect,host[:port]
  • MdsOpen, tree, shot
  • var = MdsValue(expression [,args…])
  • MdsPut, name, expression [,args…]
  • MdsClose [, tree, shot]
  • MdsDisconnect
remote access details
Remote Access - details
  • Types of client/server connections
    • MdsConnect “thin client”
      • One server process per client connection
      • Server activated by inetd
      • Expression evaluation done in server process ctx
    • TreeOpen “thick client”
      • One server process per client per tree host
      • Server activated by inetd
      • Expression evaluation done in client process ctx
mdsplus data gateway
MDSplus “Data Gateway”
  • MDSplus is sometimes used as a gateway to other data stores.
  • Expression evaluation can call into local shared libraries to retrieve or put data.
secure wan access
Secure WAN Access
  • MDSplus network protocol (MDSIP) layered on top of Globus GSI using XIO
  • X509 Credentials used to authenticate both client and server.
  • Centralized management of access control via ROAM (Resource Oriented Authentication Manager)
roam used to solve authorization problem
ROAM used to solve authorization problem
  • Resource Oriented Authorization Manager (ROAM) provides a central location for authorization information
  • Administrators & other stakeholders can control access
  • Users can request access
roam data model is fundamental to a coherent picture of authorization in the grid
ROAM data model is fundamental to a coherent picture of authorization in the grid
  • Oriented around resources: codes, databases, entire sites
  • If you have to sign a paper to get permission to use something, then it’s probably a resource
  • Resources have associated permissions
    • e.g. “execute” for a code, “access” for a site
people interact with roam through a web page
People interact with ROAM through a web page
  • An interactive web page allows users and resource owners to request and grant permissions
  • Less error-prone than editing text files
  • No more grid-mapfiles!
  • Can take the place of mdsip.hosts for MDSplus
potential use of mdsplus at fnal
Potential use of MDSplus at FNAL
  • Transfer of CERN control data to FNAL
    • Push or pull data?
      • Client application running at CERN gathering data and writing it securely to MDSplus data storage at FNAL
      • MDSplus data server running at CERN with access to control data accessible securely via client at FNAL
    • How much data? How often?
      • MDSplus is currently “pulse” based. Not designed for “trending” data (yet).
      • Extensions for long pulse/continuous data to be explored either via the “Collaborative Technology” SCIDAC proposal or ITER projects.
    • What type/structure of data? How will it be accessed?
other topics if time
Other topics (if time)
  • Electronic Logbook (quick demo)
  • MDSplus in action (C-Mod)
    • ~2GB/shot (uncompressed) 15 minute rep-rate
    • 82,000 tree nodes in each data set (“directories” and “files”)
  • Expressions examples for gateways
summary
Summary
  • MDSplus used at most fusion research sites.
  • Useful for handling some types of HEP data?
  • Next Steps?
    • http://www.mdsplus.org/
    • http://www.fusiongrid.org/
    • twf@psfc.mit.edu