Use Threads.nthreads() * 2 in TSVI
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See #924 for background.
This PR adopts a similar approach to solution (1), i.e., using
Threads.maxthreadid(). However, Mooncake can't differentiatemaxthreadid(), so this is a hacky workaround to a hacky workaround, based on the observation thatmaxthreadid()is usuallynthreads() * 2.Personally, I would be much more in favour of removing TSVI (or making it opt-in), and will probably do this in a separate PR once TuringLang/Turing.jl#2555 is solved.
But this is a quick enough fix that should ensure that TSVI continues to work on Julia 1.12 (even if for the wrong reasons). Whether we merge this will probably depend on how fast that Turing issue can be fixed -- if it's soon, then we can remove TSVI, if it's not soon, then this can plug the gap.
Note that if TSVI is opt-in, then we can just use
maxthreadid(), thereby removing one layer of hackiness — because Mooncake doesn't work with multithreaded execution anyway, the scenarios where you'd want to opt into TSVI have no overlap with the scenarios where you'd want to use Mooncake.