The creation of FFTW plans is not threadsafe https://discourse.julialang.org/t/fftw-plans-for-multiple-threads/21861 . ( Or is it? ) However, if the plan is pre-allocated, that should be thread safe? I want to pre-compute a matrix factorization (that uses FFTW internally) and use it in multiple threads…

[image] adomasbaliuka: Am I right to assume the copyto! is the problem because it modifies the buffer? Reading the buffers should be fine, right? The copyto! and the mul!. The point is that you can’t have multiple threads writing to the same temporary buffer in parallel.

Thread safety of `mul!` in `ToeplitzMatrices.jl` with FFTW plan inside Factorization

General Usage

stevengj June 8, 2023, 7:07pm 2

Yes. Plan execution is thread-safe. But I don’t know how ToeplitzMatrices uses FFTW.

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Thread safety of `mul!` in `ToeplitzMatrices.jl` with FFTW plan inside Factorization

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