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Hello, just curious what the default value of PULUMI_PARALLEL is?

I believe it's 10: <https://github.com/pulumi/pulumi/blob/56067d98e514da7e8405bc1e4cd7782f8ce71c09/pkg/backend/diy/backend.go#L1518-L1520>

I _think_ that's a different variable, which affects some operations when you are using a DIY backend

My initial hunch was that it's however many cores you have (or some multiple thereof)

E.g. if you run `pulumi up --help`, you'll see the help text for the `--parallel` flag (which that env var lets you set with the environment instead of a CLI flag) references a number that is likely some function of your CPU's advertised core count

It's `GOMAXPROCS*4` and `GOMAXPROCS` is generally just your cpu count.