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CASA Progress and Status

CASA Progress and Status. ANASAC Face-to-Face Sept 16-17, 2013. Jeff Kern. CASA Team Lead. CASA Status. CASA is in routine use at ALMA and the VLA for daily operations. Many other observatories are also using CASA 25% of NRAO CASA Helpdesk tickets are for non-NRAO telescopes

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CASA Progress and Status

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  1. CASA Progress and Status ANASAC Face-to-Face Sept 16-17, 2013 • Jeff Kern • CASA Team Lead

  2. CASA Status CASA is in routine use at ALMA and the VLA for daily operations. Many other observatories are also using CASA 25% of NRAO CASA Helpdesk tickets are for non-NRAO telescopes Improvement in performance, ease of use, and robustness are being addressed as well as the development of additional features. Reviewed in March: Report and response available: https://safe.nrao.edu/wiki/bin/view/Software/CASA/WebHome Summary: Remain focused on VLA and ALMA needs Improve fundamentals of software engineering process ANASAC Face-to-Face: Sept. 16,17 2013

  3. Organization Changes • In the process of organizing a new CASA Users Committee to solicit input from a wider segment of the CASA users community. • Details still in progress • Designed to complement the CASA Science Steering Committee (CSSC) not replace. • We are working closely with Science User Support (SUS) to do scientific validation of new CASA features prior to release. • Bi-weekly meeting to review test targets, status and assignments • DMSG has added a software testing group focused on ALMA testing, including CASA: • Focused on improving automated software testing, not validation.

  4. CASA Usage • CASA Releases are downloaded around 2000 times per release • Widely distributed download sites • Weak preference for ALMA partners

  5. Performance • CASA performance for most tasks is comparable with other packages. • Historical reputation for performance issues still linger. • Are some known poorly performing capabilities (plotting) • Parallel CASA has been demonstrated to significantly improve performance. • User interface issues / learning curve have prevented wide acceptance • Moving from home grown cluster management to MPI • Working with Scientific Computing Infrastructure group to benchmark pipelines and identify performance bottlenecks. • MSTransform task introduced: • Allows multiple actions on data with a single read from disk. • Consolidates duplicate code to single maintainable framework.

  6. Performance: Data Access (Disk I/O) • Unlike many other aspects of the processing equation, time alone will not solve the data access problem.

  7. Performance Comparison • Very simple imaging to try to minimize package variations • All tests run on Socorro cluster node against Lustre • 4000 X 4000 pixels • 3000 Components • No Boxing • 0.5 arcsec • Number of Terms = 1 • Single pointing • No Widefield • No A-Term • Briggs weighting 0 • Time to Image ~200 GB data set: CASA Review March 5-6. 2013

  8. Performance Comparison All times in Minutes CASA Review March 5-6. 2013

  9. Infrastructure Initiatives • Continued effort on Parallelization, focused on delivery of capabilities to end users/ • MSTransform to standardize I/O and decrease overall I/O volume • Imager Update • Major re-architecting to improve interface, normalize options, support for new algorithms, regularization. • Region Format: Unification and improvement across the package. • Tool Documentation: Image tool is current focus, starting to work our way through the package. • Imregrid: Major rework for more intuitive operation. • SetJy: Reorganized for more clarity in options, scriptability (pipeline), and improved capabilities.

  10. Recent Developments • Support for Linear Polarized Feeds (Required for ALMA Cycle-2) • Support for rapidly moving objects (Ephemeris Objects) throughout package • Simulation update in support of Cycle-2 CFP • Improved primary beam handling • Summer student Kara Kundert has extended her project to understand the effects of heterogeneous primary beams on image dynamic range. • Single Dish: • Introduction of CalTable like interface (Pipeline Support) • Performance Improvements • Feathering: Capability is undergoing continued enhancements

  11. CASA Viewer • Many improvements in the CASA viewer • Histogram generation and fitting • Spectral line display and fitting • Position-Velocity Curves • Interface improvements

  12. CASA ViewerPrimary View

  13. CASA Viewer:Spectral Line Fitting

  14. CASA ViewerHistogram fitting

  15. ALMA Development Program • CASA was very active in the ALMA Development program • Studies: • NRAO PI: Interoperability of AstroPy and CASA • Projects: • NRAO PI: [Sub-]Millimeter VLBI support in CASA • NRAO PI: Extended On Demand Computing • CASA Execution in external environments XSEDE • NRAO CO-I: Post imaging Analytics • Development of “value added” products for the pipeline • NRAO CO-I: Next Generation Viewer • Collaborating on a Tera-Pixel viewer

  16. The National Radio Astronomy Observatory is a facility of the National Science Foundationoperated under cooperative agreement by Associated Universities, Inc. www.nrao.edu • science.nrao.edu

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