Tensor flow toggle between CPU/GPU

Question

Having installed tensorflow GPU (running on a measly NVIDIA GeForce 950), I would like to compare performance with the CPU.

I am running the tensorFlow MNIST tutorial c

Answer 1

Another option is to install the cpu version and the gpu version of tensorflow in two virtual environments, detailed instructions on how to install tensorflow in virtual environments are listed here https://www.tensorflow.org/get_started/os_setup; in this way, you can have the same code running in two terminals windows one uses CPU and the other uses GPU.