Firedrake meeting 2020 05 12

Date and time 2020-05-12 15:00UTC (16:00BST)

Action Items

1. ALL: (ongoing) triage the open issues and confirm if they are indeed still open (and perhaps provide labels)
2. KS, (DH, LM): Document describing what we think the mixed domain interface should look like (and hence what is needed in UFL, and whether it matches the existing fenics efforts).
3. DRS: Open PR for stream plot See PR #1670. Review required
4. JB: Add mechanism for python3.8 Someone: test this.
5. DH: Find time to fix to get final complex sprint test passing.
6. ALL: Someone to look at TSFC merge needed as part of complex sprint. Miklos approved.
7. DH: Find time to sort out Jenkins to run in real and complex mode.
8. LM: Add any action items that may have been accidentally removed.

Minutes

Present: David Ham, Lawrence Mitchell, Colin Cotter, Daniel R. Shapero, Jack Betteridge, Koki Sagiyama, Nacime Bouziani, Paul Kelly, Reuben Hill, Robert Kirby, Sophia Vorderwuelbecke, Tom Gregory

Apologies:

Animation in Notebook

DRS: Put animation in notebook (Burger's equation)

Complex

Jenkins: working in real/complex modes. Hoping to get the following working:

• complex docker container
• pyadjoint in parallel

loopy: LM fixed conflicts when back merging, but many things are broken. -> cherry pick type changes?

Other branches: ufl: merged tsfc: good to go PyOP2: straightforward

All: If you want your branch tested on Jenkins, use "Draft Pull Request" feature on Github.

NB: Pointwise operators PRs

Plan: Merge PyOP2 and tsfc first, and, while waiting for ufl to be merged in FEniCS/ufl, review firedrake branch.

NB: Make a PR in FEniCS/ufl

DRS: Update on checkpointing

Desirable to be able to save multiple meshes (and associated data) PETSc currently designs namespace etc. following convention of standard visualisation tools.

DRS: Wait for some more PETSc development

LM: Replacement for expressions compiler

Expression assinment. Assignment to mixed functions is required, e.g., for RK time integration. LM explained four assignment types, L=R. For mixed function assignment, we need a kernel for each set in the mixed set.

Comments on caching: Firedrake caches for:

• assembly
• interpolation (with Interpolator object)
• pointwise assignement

Three types of caching:

1. on disk (very slow)
2. in memory (slow)
3. on the form

For large time dependent problems, this must be done efficiently.

KS: ufl.Filtered -> ufl.Transformed

PR created: https://github.com/FEniCS/ufl/pull/22

KS: Add documentation to ufl/doc.

Date of next meeting

2020-05-19 15:00UTC (16:00BST)