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Is there a way to execute multiple pulumi stacks in parallel?

pretty sure the answer is no for the CLI itself, but I don’t think anything prevents you from running multiple instances of the CLI in parallel?

Sure, this option is always there, just checking whether there is a built-in support

Yeah - you would need to run separate `pulumi up`s for each - but of course can do that in parallel on a single machine if desired. 

In this case I need to resolve cross-stack dependencies myself, was hoping that pulumi cli can handle for me.

Definitely. This sounds related to <https://github.com/pulumi/pulumi/issues/2309>. Would love to get details of your scenario on that issue so we can track for future additions in this area. 