Regarding the BNS issues, is it something due to when you recover from checkpoint?
In Whisky we had an issue related to that due to Con2Prim running after recovery from checkpoint. E.g., you run a simulation from iteration 0 to iteration 24 (made up numbers just to explain myself). You try the same simulation, but this time you run from 0 to 12, checkpoint, recover from checkpoint and run from 12 to 24. The results between these two simulations at iteration 24 were slightly different The issue was in the Newton Raphson being called by Con2Prim and using a different initial guess when recovering from checkpoint. During a run it uses the previous values of the primitive variables as an initial guess, but these are not available when restarting from checkpoint. The solution, as far as I remember, was not to run Con2Prim during recovery from checkpoint (since the primitive variables are anyway recovered from the checkpoint files). Cheers, Bruno Il giorno gio 16 gen 2025 alle ore 19:59 Roland Haas <rh...@illinois.edu> ha scritto: > Hello all, > > > # Reproducibility issues with BNS > > * Wolfgang Tichy has obtained different results with different MPI > ranks on > Sorry, my bad. Correction: Michal Pirog (who is working with Wolfgang) > noticed these. > > Yours, > Roland > > -- > My email is as private as my paper mail. I therefore support encrypting > and signing email messages. Get my PGP key from http://pgp.mit.edu . > _______________________________________________ > Users mailing list > Users@einsteintoolkit.org > http://lists.einsteintoolkit.org/mailman/listinfo/users > -- Prof. Bruno Giacomazzo Deputy Director of the Department of Physics University of Milano-Bicocca Piazza della Scienza 3 20126 Milano Italy email: bruno.giacoma...@unimib.it phone: (+39) 02 6448 2321 web: http://www.brunogiacomazzo.org --------------------------------------------------------------------- There are only 10 types of people in the world: Those who understand binary, and those who don't ----------------------------------------------------------------------
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