  Many of the most performant deep learning models today in fields like
language and image understanding are fine-tuned models that contain billions of
parameters. In anticipation of workloads that involve serving many of such
large models to handle different tasks, we develop Computron, a system that
uses memory swapping to serve multiple distributed models on a shared GPU
cluster. Computron implements a model parallel swapping design that takes
advantage of the aggregate CPU-GPU link bandwidth of a cluster to speed up
model parameter transfers. This design makes swapping large models feasible and
can improve resource utilization. We demonstrate that Computron successfully
parallelizes model swapping on multiple GPUs, and we test it on randomized
workloads to show how it can tolerate real world variability factors like
burstiness and skewed request rates. Computron's source code is available at
https://github.com/dlzou/computron.
