pppl spring/summer co-op 2006 stephen krenzel. focus of the co-op the co-op focused on improving...
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![Page 1: PPPL Spring/Summer CO-OP 2006 Stephen Krenzel. Focus of the CO-OP The co-op focused on improving ElVis, an application for the visualization and monitoring](https://reader036.vdocuments.us/reader036/viewer/2022062520/56649ea35503460f94ba7647/html5/thumbnails/1.jpg)
PPPL Spring/Summer CO-OP 2006Stephen Krenzel
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Focus of the CO-OP
The co-op focused on improving ElVis, an application for the visualization and monitoring of scientific data.
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Application or Applet
Commands
rplot text
Original ElVis Architecture
Initially, rplot sent data directly to ElVis, or data was read from the local file system.
ElVis
File-System
rplot
elvis_serverelvis_port
Application or Applet
Network
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Application or Applet
Commands
rplot text
ElVis Portal ArchitectureElVis is moving to a services oriented architecture. ElVis can now acquire data through a compute service. This allows ElVis to run effectively as an applet in a web browser or as a stand-alone application. It also supports collaboration betweenusers. Many of ElVis' design decisions are now centered around constraints imposed by applets.
ElVis
File-System
ElVis Servlet
Graph WindowHandler
cltermpty
rplot
elvis_serverelvis_port
Elvis API
Commands
rplot text
Rplottext
stdio
Application or Applet
xml data
Network
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Areas of Attention➢ XML Protocol for ElVis API➢ Logarithmic Plotting➢ Whiteboard➢ Development Process
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XML File Format➢ XML (eXtensible Markup Language) is a
general purpose markup language for describing structured information.
➢ Human-readable, yet easily handled by machines
➢ Self-documenting and widely supported➢ Example:
<memo date=”02/19/99”><to>Peter</to><from>Bill</from><heading>Reminder</heading><message>
Don't forget to put the newcoversheet on the TPS reports.
</message></memo>
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EML (ElVis Markup Language)➢ Old format:
➢ Proprietary binary byte-stream➢ Many compatibility and versioning issues
➢ New XML based format:➢ Implemented using open industry
standards, and a robust framework (dom4j)
➢ Easily extended, and important to ElVis moving forward
➢ Formally specified in a Document Type Definition (DTD)
➢ allows others to easily adopt the format
➢ Network transparent and backward compatible
➢ Speed: ~70,000 data points / second➢ (SUN Java 1.4.2_11, Intel Xeon 3.00Ghz, 2.4.21 Linux kernel )
➢ Size: XML is verbose, however has very high compressions ratios if size becomes a problem. Typically on the order of 91% - 99% in tests done on EML files.
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Simple EML Example• <?xml version='1.0' encoding='utf-8'?>
• <visualstate>
• <graphwindow>
• <graph title="test">
• <axis text="X" direction="x"/>
• <axis text="Y" direction="y"/>
• <data1d name="data">
• <point x="0" y="0"/>
• <point x="1" y="2"/>
• <point x="2" y="4"/>
• </data1d>
• </graph>
• </graphwindow>
• </visualstate>
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Logarithmic Plotting➢ ElVis now supports viewing data linearly
or logarithmically on either axis➢ Applies to single or multi-variable data➢ Translating and scaling of logarithmic
axes are still in progress➢ Tested to work with rplot and sigtab➢ The classes were also utilized by Tarun
Pondicherry in his work with logarithmic surface plots
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Log axis class used in surface plots.
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Whiteboard➢ Users can now draw arrows, circles,
rectangles, lines, and freestyle➢ Anything that can be drawn, including
highlights on data, can have its color, thickness and style set
➢ Objects can now be selected, translated, removed, and have attributes modified after being drawn
➢ Highlights on indexed data persist as the data is animated, allowing areas of interest to remain marked
➢ Whiteboard objects are now saved and read from NetCDF files
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Development Process➢ Introduced the Eclipse integrated
development environment (IDE)➢ Facilitates team oriented
development through tight integration with CVS
➢ Iterative compiler➢ Code changes are applied in real-
time➢ This is particularly useful when
setting up test cases➢ Has easy to use debugging utilities➢ Intelligent code handling and
general “awareness” of potential issues
➢ Some support for other languages as well
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Using the eclipse debugger was invaluable for debugging image display code.This is another java client for the reflectometer. Three images, each at differentresolutions, overlapping.
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Development Process➢ Some code was optimized by removing
instances of unnecessary code➢ i.e. methods being called to update
values that hadn't been changed➢ Assisted by Eclipse's code analysis tools,
over 550 warnings, bugs, and miscellaneous fixes (i.e. unused code) were made
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Summary➢Enhancements to ElVis Architecture➢Log Plotting➢Whiteboard➢Software Development Environment (Teach a man to fish...)
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Thank You• In particular, I'd like to thank
Eliot Feibush, Doug McCune, Drexel University and the Princeton Plasma Physics Lab.