Hi there,
core developer of Juniper here.
You actually need to also set an option to run a single instance in parallel. See:
https://lanl-ansi.github.io/Juniper.jl/stable/options/#Parallel
(edit: I somehow didn’t see the link by @odow …)
Hope that helps. Let me know if you have further questions.
Thanks for the ping @TheCedarPrince
Cheers,
Ole