E: Thread safety

[davebayer]

Rewrite the implementation to be thread safe.

Backends

clFFT

The library is thread safe. link

FFTW3

Only fftw_execute_* functions are thread safe. All other functions should be guarded with a global mutex. link

cuFFT

The library is thread safe. link

Intel MKL

The library is thread safe. link

hipFFT

Probably thread safe, the docs do not specify, however there are some git commits refering thread safety.

PocketFFT

Thread safe, the only part that could potentially not be thread safe, could be the cache, but we do not use it.

rocFFT

Probably thread safe, the docs do not specify, however there are some git commits refering thread safety.

vkFFT

"VkFFT should be thread-safe, apart from the locale changes in sprintf, where you have to manage locale from outside VkFFT on multithreaded systems." - Tolmachev Dmitrii, link

GPU Backends

CUDA

The library is thread safe. link

HIP

It probably is thread safe as it copies the behaviour of CUDA.

OpenCL

The library is thread safe. link

Multi-process backends

MPI

We can find out at runtime by MPI_Query_thread. link