Firedrake meeting 2021 10 14

Date and time 2021-10-14 15:00UTC (16:00BST)

Action Items

1. Pick Chair and Minuter.
2. ALL: (ongoing) triage the open issues and confirm if they are indeed still open (and perhaps provide labels)

Minutes

Present: Dan, David, Jack, Pablo, Rob, Lawrence, Patrick, Connor, Nacime, Sophia

Apologies:

Proposal: Determining whether offset is required from the measure - CW

We are trying to generate PyOP2 packing code using just UFL. For the case of an extruded mesh it should be possible to determine what offset should be. However, UFL doesn't know that it is operating on an extruded mesh so we don't know whether offset is needed or not. Our proposal is to attach this information as metadata to the UFL measure. Is this the right thing to do?

• offset is not only one number, it's an arity tuple
• for time stepping e.g. we want to cache independent of data
• extrusion is mesh property, maybe just add property to ufl.mesh
• be careful that it is hashable

Merge PRs:

CW: https://github.com/OP2/PyOP2/pull/642

DS: https://github.com/firedrakeproject/firedrake/pull/2244

PB: https://github.com/firedrakeproject/firedrake/pull/2024

• a notebook would be nice
• generally more public preconditioner manuals would be nice, just have a list and link to the modular docs

LM: https://github.com/FEniCS/ufl/pull/69

AOB

Date of next meeting

1500 UTC (1600 BST) 2021-10-21