Gpu utilization is 0%

I’m training a model on my data, the model is based on CommonVoice recepie. The GPU-Util is almost all the time 0 %, sometimes it jumps to ~50% but the majority of time it 0. What could be the problem (data loading??), any hints on where to start the debugging?

Maybe you are being IO limited? If your process is often stuck in the D state on htop, and CPU usage isn’t abnormally high, then random file seeking might be the bottleneck.