Maxim Kontsevich reported patently wrong answers from modular forms code in https://github.com/sagemath/sage/issues/41267. We were able to pin them down to setting Parallelism().set(nproc=k), for any k>1. The error is not dependent upon the platform (observed in Linux Conda originally, but meanwhile found to occur in "normal" builds, too, on Linux x86_64 and on Intel macOS) - arm64 etc still needs to be checked.
It would be great to understand what fixed it - any ideas? For reasons unclear to me, the git history between tags 10.6 and 10.7 is not clean (somehow, 10.7 is not "based" upon 10.6 in Git sense), breaking a straightforward git bisect. Help with the latter would be appreciated, too. (otherwise one would need to do a manual git rebase of 10.7 over 10.6, which isn't instant) Dima PS. Computations done in Sage 9.7-10.6 under Parallelism().set(nproc=k) (e.g. one might have set "Parallelism().set(nproc=42)" in ~/.sage/init.sage/) thus might be incorrect :-( -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/sage-devel/CAAWYfq0NoeR%2BxKRsKgvk-0P5PHyk1Tnc35gXhxXs-rSwc6gM-g%40mail.gmail.com.
