Nix build progress bar meaning

I’ve been using nix with flakes for quite a while now, and it occurred to me that I actually don’t know what the numbers reported in the progress bar of nix build actually mean.

It’s not hard to deduce from 4/128/486 that there are 486 remaining to build, but it’s less clear what the 4 and 128 mean - why are there two numbers?


I think 4 is how many are building rn (can be configured with --max-jobs). And the 128 is how many you built since running the command.

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Thanks! A sort of related follow up question - is there a way of expanding this progress bar to print out more of the build logs as they are generated. It’s nice to see more information for long builds

Yes, pass the -L / --print-build-logs flag.