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Is it safe to have parallel executions of `pulumi up` in *different* stacks? Managed to find some open issues about enabling parallelism in automation API, wanted to make sure whether it is safe in case of CLI.

if you're running against different stacks, yes it is!

<https://github.com/pulumi/pulumi/issues/6287|https://github.com/pulumi/pulumi/issues/6287>
So can I safely assume that `workspaces` file is managed per workspace, per stack?

There’s a little more information in <https://github.com/pulumi/pulumi/issues/8186> about what exactly causes the `workspaces` corruption

TL;DR  it’s the `createStack` or `selectStack` function running in parallel that causes the corruption, running `up` with local programs should be fine