2021.05.13 Meeting Notes

Agenda

• Individual/group updates
• Status of Argonne GPU Hackathon
• Paper
• Review non-WIP PRs

Individual/group updates

LANL CS

Joshua Brown

• Currently, running weak scaling test with Jonas HDF5 compression implementation
• Submitted a pr to add mpi-performance-regression tests
• Submitted a pr to fix scheduled ci runs of performance regression tests
• Code review

Jonas Lippuner

• Been redoing the sparse interface after getting feedback from Jonah
• Moved communication into the initialization
• Sparse variables will now be the same as cell variables, metadata now exists everywhere, every block and rank will have the same structure.
• Also been working on GPU hackathon

LANL Physics

Jonah

• GPU Hackathon
• Spent time testing performance in Phoebus instead of riot because need sparse pr to be merged before can use it fully in RIOT.
• Spent time analyzing why Parthenon actually became slower after implementing a fix. Discovered that old machinery was being called instead of newer faster implementation. Fixed the problem and saw a factor of 10 improvement on 16 cubed cells.
• Hackathon improvements look to have improved the remeshing algorithm by about 30 %

Ben Ryan

• Been working on downstream code with Phoebus seems to be working well.

AthenaPK

Philipp Grete

Forrest Glines

Agenda

Hackathon

Paper

TODO