[Users] meeting minutes for 2017-05-01

[Roland Haas]

Present: Frank, Roberto, Steve, Roland, Eloisa, Gabrielle, Bhavesh,
Erik, Manuela, Yosef, Zach, Qian, Eliu, Haris, Vassili, Pablo

project presentation and reporting:
* Gabrielle presented plans on more formal project reporting,
https://hangouts.google.com/hangouts/redirect?dest=https%3A%2F%2Fdocs.google.com%2Fpresentation%2Fd%2F1Bl-iENaNlEAI594cr_6AT2SpIB83z3ToXTmvTyia2No%2Fedit%3Fusp%3Dsharing
* would weed out ghost projects, developers and maintainers when
  projects no longer provide updates
* allow to coordinate and organize projects "endorsed by the project"
* "working groups" are longer lived entities, while "devlopment teams"
  are ephemeral that vanish once the project is done
* action item: discuss offline and provide input, decide which working
  groups to participate in, will discuss again next week

DataVault:
* An Einstein Toolkit Data Repository
  https://drive.google.com/file/d/0B5-y-9jNuShAWVdUNmZHbm5pckk/view
*  Timeline summary:
  Year 1: prototype
  Develop components for generating metadata, basic archive services at
  NCSA.
  Year 2: development
  ...and add parameter files and a suite of initial data files to the
  DataVault.
  Year 3: user-ready
  Archive open for community data entry. Evaluation of tools.
  Year 4: tutorials
  to archive all of the data generated in the Einstein Toolkit DataVault
* datasets will contain metadata describing it, some of it
  automatically generated some of it manually entered. Will contain doi
  URL for citation and reference purposes.
* TBD: license of data, what metadate to include, where is the data
  stored will be sent out survey form to list next week
* will also provide instructions on how to set up your own data storage
  eventually, however the primary goal is to explore the framework and
  find out what is required for a functional system
* currently storage by third party repositories is not yet 
* currently datavault has funding for a small amount of storage, want
  to collect use cases and how to hook up datavault to institutional
  repositories. Currently sizes are limited to ~TB per year and GBs for
  individual files. 
* will discuss again next week after survey

Project reports:
NCSA:
* see Qian's presentation
RIT:
* implement spherical coordinates BSSN code in ET codes in
  collaboration with Thomas Baumgarte and Zach Etienne. 
* working on infrastructure in Cactus to get boundary condition
  parallelized in ET (similar to rotatingsymmetry180 using slab thorn).
  Will be made available (incl. doc) once finished, currently being
  tested with a WaveMoL code which is working right now.
* aim to have code available publicly in July
* suggestion to make development code visible (at least to ET
  developers) so gather feedback eg on boundary condition
* Zach and Thomas are working on generating code for the stencil in
  different coordinate systems. Will now merge the two sub-projects.
* currently the arrays x,y,z contain r,theta,phi right now. Have to
  decide if we want to keep this or introduce a new "SphereGrid" thorn.
  Currently implementation was chosen due to ease of using existing
  code.
* hydro equations are ready to be implemented, MHD equations are still
  being worked on
* suggest spherical wave code as possible module in educational code
  repository that is part of SI2. More complex than Cartesian code so
  need to decide if extra complexity is acceptable.
LSU:
https://docs.google.com/document/d/1yX3rkcnsVbSovsh8_sZaqmZ8XEgGkQzggZ-EX09rrHg/edit
* Steve Brandt has been working on a pre-sync branch of Carpet that
  automates synchronization and handles it in a lazy manner. This would
  eliminate one of the most tricky pieces in designing a Cactus
  schedule. A prototype exists on bitbucket
https://bitbucket.org/cactuscode/cactus/branch/presync
GT:
* https://drive.google.com/file/d/0B3bzSynUjI9pQ3lnSURNbkpiNzQ/view
* ID solutions mimicking astrophysical systems, currently single
  spherical system with different EOS
* idea presented in: https://arxiv.org/pdf/1606.04881.pdf
* infrastructure for binary neutron star simulations

action items for future:
* continue DataVault discussion after survey results (Qian)
* provide presentation of math behind spherical coordinates code
(Vassili)

ET meeting in Europe:
* maybe combine with meeting in Barcelona 16-20th
http://astro-gr.org/astro-gr-barcelona-2017/
* mostly a retreat style for developers only

ET meeting at NCSA:
* want to have developer meeting in addition to retreat in Europe?
* at least for the EU there is enough interest to justify two meeting
* similar in North America
* more details in separate mail to list

Yours,
Roland

-- 
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from http://pgp.mit.edu .
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