ETTR, aka, how good is the training goodput

Effective training time ratio (ETTR) defines the ratio of time spent in training to the wall clock time. In intuitive terms, it is the goodput of the training job. Any time spent doing non-productive (i.e., non-training) work takes away from the goodput. Non-productive time includes reading and writing checkpoints. It also includes the time that was spent in training but had to be repeated because…