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Getting started

• [Guide to getting started](Getting Started)
• Partial list of supported compilers

Con2Prim

As a first step we will use Reprimand to reduce the complexity of code we implement. Instructions for this are found here

NERSC Hackathon

• Wiki root for the hackathon

CarpetX ideas

• ideas: call scheduled functions with full MFab: done
• ideas: use OpenMP tasking or similar to have a more task based scheduling
• work item ideas

CarpetX implementation tasks

• vertex centered grid functions by default: done
• test multi-node GPU support: done
• checkpoint / restart
• test a qc0 run or similar to compare results and speed to Carpet w/o subcycling in time
• subcycling in time, likely using runge-kutta prolongation
  • allow flexibiliy of subcycling vs no subcycling on a per level case, currently partially implemented

Workshop tasks

• Get the image setup to run code [Steve]
• Get the shocktube/KHI notebook working [Lorenzo]
• Slides [Federico]
• Fix AMR [Erik]

Workshop Timeline

• 16/05 Create workshop branch (code freeze) with AMR
• 16/05 Ready the KHI thorn for AsterX
• 21/05 Final pre-compiled Cactus on K8
• 21/05 Ready visualization of plots
• 24/05 Copying pre-compiled Cactus for each user
• 24/05 Presentation ready (common slides)
• 26/05 Ready tutorial Jupyter notebook to be shared with participants
• 07/06 Mock run with ~12

Workshop tutorial schedule

The authorative source of information is the program page.

title	date	start time	end time	needs GPU
New user tutorial	June 13	2:05PM PDT	3:50PM PDT	no
Thorn writing	June 13	3:20PM PDT	6:05PM PDT	no
Kuibit	June 16	4:20PM PDT	6:05PM PDT	no
GPus	June 17	4:20PM PDT	6:05PM PDT	yes

CarpetX desired feature list

Science runs would be say a MHD driven supernova with tracer particles and a neutrino evolution scheme. This would require these abilities:

• cell centered grid with AMR for fluid
• vertex centered grid with AMR for metric
• staggered grid for magnetic field
• subcycling in time
  • Runge-Kutta prolongation into mesh refinement boundaries to avoid "buffer" zones (which AMReX may not support)
• some sort refluxing for fluid due to subcycling in time
• some sort of monopole avoiding prolongation scheme for B
• some sort of scheme that conserves magnetic flux at mesh refinement boundaries
• interpolators to get values of fields at particle locations
• reduction operators for min, max, sum etc.
• checkpoint and recovery
• 3d output for visualization: done
• GPU support
  • for RHS calculation: done
  • for AMR operators
  • for everything else