The --double-precision command line argument is not applied to the FFT
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mortele commented
The initialization of the pmesh object should use something like dtype="f8" if dtype == np.float64 else "f4" in
pm = pmesh.ParticleMesh(
config.mesh_size, BoxSize=config.box_size, dtype="f4", comm=comm
)Currently it is just locked to using single precision floats always.