May 16, 2018, midnight
By : Eric A. Scuccimarra
I was training a model on a Google Cloud instance with a Tesla K80 GPU. This particular model had more data pre-processing required than normal. The model was training very slowly, the GPU usage was oscillating between 0% and 75-100%. I thought the CPU was the bottleneck and was trying to put as much pre-processing on the GPU as possible.
I read TensorFlow's optimization guide, which suggested forcing the pre-processing to be on the CPU by enclosing it with:
Since I thought the CPU was the bottleneck I didn't think that would help, but I tried it anyway because I had no other good ideas and was surprised that it worked like magic! The GPU usage now stays constant around 95-100% while the CPU usage stays at about the same levels as before.
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