2024.01.25 Meeting Notes

Agenda

• Individual/group updates
• Coordinates implementation
• Future of SparsePacks
• review non-WIP PRs

Individual/group updates

JD

• new tasking infrastructure got merged after figuring out couple of corner cases in threading
• found other bug related to iterative tasks (already identified in case of iterative pushes of particles), should be fixed soon
• working on making rest of Parthenon thread-safe
  • big item: caching of packs
  • related discussion: future of packs (which one should we continue and which one deprecate)

JM

• has a new grad student working on refactoring MeshBlockPacks everywhere
• resulted in new PR on tensor indices for SparsePacks

BP

• SMR with face centered CT works nicely in KHARMA
• Will upstream prolong/restriction ops
• Will eventually also some improvement of life hack into Parthenon, like 3D index ranges

PM

• new hook after ProblemGenerator and before PreFillDerived

FG

• working on PPM for curvilinear coordinates
• finalizing yt PR to support curvilinear coordinates
• bash script to monitor job output (e.g., for stalls on IO)

PG

• trying to identify bug with few blocks per rank on init (seen on Lumi)
• tracking performance regression when linking to Ascent (again on Lumi)
• still working on OpenPMD output
• will give OLCF monthly user call presentation

Coordinates implementation

• JM thinking about adding a coordinate field to the Mesh(Block) to store coordinate info (e.g., for Lagrangian codes)
• BP has a branch for yt frontend to convert "transformed" coordinates (e.g., for GR)
• regarding difference in curvilinear coordinates in AthenaPK/Parthenon versus other downstream implementation. FG and PM will setup separate meeting.

Future of SparsePacks

• General agreement that legacy packs will go and SparsePacks become Sparse
• Will open an issue to track progress

Next meeting tentatively 8 Feb