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Trilinos Strategic (and Tactical) Planning

Trilinos Strategic (and Tactical) Planning. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94AL85000. Outline of Talk. Strategic Goals. Future Trilinos Presentations.

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Trilinos Strategic (and Tactical) Planning

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  1. Trilinos Strategic (and Tactical) Planning Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,for the United States Department of Energy under contract DE-AC04-94AL85000.

  2. Outline of Talk • Strategic Goals. • Future Trilinos Presentations. • Decisions: Made, pending, emerging. • Brainstorming.

  3. Trilinos Strategic Goals • Scalable Computations: As problem size and processor counts increase, the cost of the computation will remain nearly fixed.   • Hardened Computations: Never fail unless problem essentially intractable, in which case we diagnose and inform the user why the problem fails and provide a reliable measure of error. • Full Vertical Coverage: Provide leading edge enabling technologies through the entire technical application software stack: from problem construction, solution, analysis to optimization. • Grand Universal Interoperability: All Trilinos packages will be interoperable, so that any combination of packages that makes sense algorithmically will be possible within Trilinos and with compatible external software.  • Universal Accessibility: All Trilinos capabilities will be available to users of major computing environments: C++, Fortran, Python and the Web, and from the desktop to the latest scalable systems. • Universal Solver RAS: Trilinos will be: • Integrated into every major application at Sandia (Availability). • The leading edge hardened, efficient, scalable solution for each of these applications (Reliability). • Easy to maintain and upgrade within the application environment (Serviceability). Algorithmic Goals Software Goals

  4. Trilinos Presentation Forums • HPCSW Workshop Tutorial • High Performance Computer Science Week (HPCSW) • Successor to LACSI Symposium. • March 31 – April 4, 2008, Denver. • ACTS “Hands-on” Tutorial: • Aug 19-21, 2008 (approximate). • At Lawrence Berkeley Lab, Berkeley, CA, USA. • Next Trilinos User Group Meeting: • Proposal: Oct 21-23, 2008. • Old LACSI Symposium week. • At Sandia National Laboratories, Albuquerque, NM, USA. • SciDAC Conference (tentative). • July13-17, 2008. • Seattle. • SC2008 Tutorial?

  5. Decisions Made: Scope • Trilinos scope is larger: capabilities, customers, platforms. • Capabilities key descriptors: When is a package appropriate for Trilinos? • Embeddable, reusable, interoperable. • Scientific/engineering. • Not applications (but probably app components in the future). • Others? • Customers: • NNSA, DOE Office of Science. • DoD, DHS, general WFO. • Broader community. • Platforms: • All Oses: Unix/Linux, Windows, Mac • Standard command line, Visual Studio, Xcode. • Goal: Downloadable self-extracting archives. Cmake is the ticket.

  6. Decisions Pending: Aggregation • 40+ packages: Aggregation necessary in some way. • Miller’s Law: 7 +/- 2. • How to aggregate? • Already some: • Epetra_Operator/RowMatrix. • Thyra operators evaluators. • Stratimikos. • How do we build on this? • No reason to introduce hierarchy in repository. • Aggregation in: • Concept, documentation, packaging. • Big question: What gets put together? • Proposal: Start with Stratimikos-related packages?

  7. Decisions Emerging: TDD • Rigor alternative? • TDD Steps: • Write the test. • Test and prove it failed. • Write code. • Prove test passed. • Test-driven development. • How? • Make test registration easier. • Inspections: Higher priority. • How do we facilitate? • Actions: • Develop checklist for closing bug review: • Code review, confirm that test checked. • Second person signs off on bug. • Add item to release checklist asking if code was reviewed.

  8. Decisions Emerging: Others • Source management: • Continue looking at options. • M. Eldred brings up good arguments for SVN. • Trilinos Advisory Group: • Group of Trilinos technical stakeholders. • Quarterly phone meetings. • Communication of framework related issues. • Meant to communicate and avoid misunderstandings: • SIERRA BJAM decision. • If TAG around, could have avoided a lot of confusing discussion.

  9. Risks: Infrastructure staffing • Loss of (and risk of loss of) critical skill sets: • Mike Phenow plans to leave at the end of January. • Present staffing model for infrastructure is weak, unattractive. • Staffing for support is less than 2 years ago (1.5 vs. 2), size of project much larger. • Working toward a matrixed solution. • ID’ed an additional role: scientific programmer.

  10. Brainstorming • What’s missing from the vertical software stack? • Goal: Build an application using Trilinos building blocks. • Only the physics or similar is unique. • Andy’s list. • Tools for AtC interaction: Helgi Adelsteinssen, RichL. Mike Parks, Greg Wagner, Kevin Long. • Interaction with UQ efforts (John Red-Horse). • Builds from an app perspective. • Other topics? • Performance and scalability: • Can apps use Trilinos to get performance beyond previous capabilities? • Performance benchmarks in apps. • What are the drivers?

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