Is it possible to get the current number of active FFTW threads?

[IanButterworth]

For profiling purposes I'm interested in developing a julia tool that asynchronously monitors threading load and measure quality of threading balance.

That's simple now in julia 1.8 because profiling can identify which julia tasks/threads are awake.

Is there a way to do that asynchronously with FFTW? Crudely, just a count of active FFTW threads at a given time?

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Answering my question partly, as on inspection I'm realizing that FFTW threads are managed by julia via @spawn

FFTW.jl/src/providers.jl

Line 58 in 17bc81a

Threads.@spawn ccall(f, Ptr{Cvoid}, (Ptr{Cvoid},), fdata + elsize*i)