August 2021 - firedrake - imperial.ac.uk

How to get mesh diameter
by Praveen C 28 Aug '21

28 Aug '21

Dear all I am a new user of firedrake but old user of fenics. I need your help to compute the mesh diameter, i.e., max diameter of all cells in the mesh or some representative mesh size to use in a mesh convergence study. Thanks a lot praveen

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Firedrake '21 - Abstract submission and early registration deadline approaching
by Ward, Connor 25 Aug '21

25 Aug '21

Dear Firedrakers, This is a reminder that the deadline for abstract submission and early registration for the Firedrake '21 workshop is 31st August - next Tuesday. The workshop will be held online in the afternoons (UK time) of 15-17 September. It is an opportunity for users and developers of Firedrake and its related tools to present their work, and to learn from and interact with other members of the Firedrake community. We encourage everyone, no matter what you are using Firedrake for, to come and show off your work. Early registration is just £10, increasing to £20 after next week's deadline. For further details and links to abstract submission and registration, see: https://firedrakeproject.org/firedrake_21.html. Firedrake '21 — Firedrake 0.13.0+4698.gdd139d71 documentation<https://firedrakeproject.org/firedrake_21.html> Firedrake ‘21¶. We are very happy to announce that the fifth Firedrake user and developer workshop will be held online between 15-17 September 2021. firedrakeproject.org Warm regards, Connor

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Recurring memory error
by Andrew Hicks 14 Aug '21

14 Aug '21

Hello all, I am struggling because I often get this same error popping up after I have been running many (several thousand) time steps of my PDE solve in Firedrake: OSError: /scratch/ahick17/firedrake/.cache/pyop2/94/0b1edf26475b324382a572af1239dc.so: cannot change memory protections Thankfully I always save state so I can simply resume the time steps and it always resolves. However, this is a bit annoying to have to deal with and I was wondering, what is causing this, and is there any way to fix it? Andrew Hicks

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Warning about number of OMP threads
by Andrew Hicks 03 Aug '21

03 Aug '21

Dear Firedrake, I recently tried to run Firedrake using "mpiexec -n 80", so 80 threads, to improve performance. But I got the warning "OMP_NUM_THREADS is not set or is set to a value greater than 1, we suggest setting OMP_NUM_THREADS=1 to improve performance" which doesn't really make sense in my mind since I want 80 threads. Perhaps I am misunderstanding what's going on here. So, is this a problem, and if so, how can I set OMP_NUM_THREADS=1? Andrew Hicks

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Firedrake '21 Online 15-17 September
by Ham, David A 03 Aug '21

03 Aug '21

Dear Firedrakers, The Firedrake ’21 workshop will be held online in the afternoons (UK time) of 15-17 September. This is an opportunity for users and developers of Firedrake and its related tools to present their work, and to learn from and interact with other members of the Firedrake community. I’d like to invite everyone in the Firedrake community, new and old, and no matter what you’re using Firedrake for to come and show off your work. For further details and abstract submission, see: https://firedrakeproject.org/firedrake_21.html . Registration will be just £10 and will open shortly. I hope to see you all there, David -- Dr David Ham Department of Mathematics Imperial College London https://www.imperial.ac.uk/people/david.ham

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