[eyberg]

Generally speaking multi-tasking includes both multi-processing and multi-threading. Many unikernel projects support multi-threading so languages like Go/Rust can work very very well when deployed as unikernels. As for scripting languages like javascript, python, ruby they are inherently single-process regardless so you have to horizontally scale those. (eg: instead of having N servers having nginx front-end X app servers you just right size your workloads and spin up as many app servers you need behind a load balancer)

There's only one project I'm aware of that does multi-processing: https://cybersecurity.springeropen.com/articles/10.1186/s424... .