Jethro's Braindump

Parameter Servers

Parameter servers are used in the distributed training of neural networks. Both GPUs and CPUs can be used to compute gradients independently, which are sent to a central parameter server. The parameter server then uses an optimizer such as SGD or Adam, computing the gradient updates.

Parameter servers offer better performance over all-reduce because of its ability to utilize CPUs (unlike All-reduce), but in practice the performance leaves much to be desired.