Avoiding restart kernel

[JosephP91]

Hello everybody. I was wondering if there is a way to avoid starting a new kernel every time a notebook execution is requested.

[MSeal]

Since there's no server managing kernel lifecycles you'd need some extended architecture to lean against to launch and reap kernels. To plug into that architecture you'd need to register a custom engine which skips nbconvert's kernel launch step and connects directly with some target kernel that's already alive.

Generally this won't be supported in native papermill except to well established remote systems like kernel gateway (see: #303). If there's a system you'd like to have native extensions to, we're always happy to help guide how to add it to papermill or suggest how to embed custom extensions for less general use-cases.