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Firedrake meeting 2021 07 28

Reuben W. Nixon-Hill edited this page Jul 28, 2021 · 8 revisions

Date and time 2021-07-21 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)
  3. (JB, DH, KS, JW): Firedrake training happening 23rd August, update
  4. DH: Firedrake 2021 update

Agenda

Present:

Apologies:

RNH: Issue #2095 Loopy breaking Interpolation Kernels

Complex data types are getting into real mode PyOP2 Kernels (can't create a "Real" interpolator for example).

CW: What is the data representation of a MixedDat?

From this issue it is suggested that the data part of a MixedDat is just the concatenation of several Dats. So a MixedDat containing 3 Dats of length n and dim=3 would have shape (3, n, 3). How does this work if the Dats have different dims?

CW: Proposal: A new type system for PyOP2

I am currently trying to introduce a strict divide between the code generation and parloop execution stages in PyOP2. In order to do the code generation we need to know certain bits of information about the data we are operating on such as: dtype, dim (its local shape), map arity, and access descriptor; but we don't want to tie ourselves to the actual data structures.

The suggestion is that these properties can be considered 'type' information for the Dat/Map/Global etc. We could canonicalise this by declaring these attributes as explicit types. E.g. ScalarDatFloat64 or Global3Int32 (names to be bike-shedded). Code generation could then happen by only passing in the relevant type(dat) instead of storing this information in some sort of namedtuple/dataclass.

There are some outstanding questions about this:

  • What do we do about 'type' information that is more varied (e.g. map offset)?
  • What about mixed?

RNH - Workers dying when running tests

See for example https://github.com/firedrakeproject/firedrake/runs/3181344420. Can code mistakes cause this to happen or is it a hardware problem?

RNH - FInAT dual evaluation feedback

Merge PRs:

AOB

Date of next meeting

2021-07-28 15:00UTC (16:00BST)

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