k-Wave User Forum » Topic: GPU slower than CPU due to FFT preprocessing

k-Wave User Forum » Topic: GPU slower than CPU due to FFT preprocessing http://www.k-wave.org/forum/topic/gpu-slower-than-cpu-due-to-fft-preprocessing Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 22:28:45 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://www.k-wave.org/forum/search.php zak morgan on "GPU slower than CPU due to FFT preprocessing" http://www.k-wave.org/forum/topic/gpu-slower-than-cpu-due-to-fft-preprocessing#post-9090 Thu, 09 May 2024 00:06:47 +0000 zak morgan 9090@http://www.k-wave.org/forum/ <p>Hi, I'm new to k-wave and noticed that when running on the CPU c++ code pre-rpocessing is instant and then my simulation takes about 47 seconds, however when running the CUDA code, the simulation takes about 10 seconds, but 80 seconds is spent on pre-processing the FFT. Is this expected? </p>