We want it to be 4 jobs in parallel, with 4 cores each.
https://github.com/ngi-nix/ngipkgs/blob/7fcdef3ed9e3e3636ae669e82d03d7266798ffe1/infra/makemake/configuration.nix#L39-L47
But currently, it seems to be 16 jobs in parallel, with 4 cores each.
ngi-nix/ngipkgs#1298 (comment)

With 16 heads boards getting built at the same time, their individual build times blow up to >2h. A full rebuild takes ~6h and has the CI machine more or less overloaded until it's done.
We want it to be 4 jobs in parallel, with 4 cores each.
https://github.com/ngi-nix/ngipkgs/blob/7fcdef3ed9e3e3636ae669e82d03d7266798ffe1/infra/makemake/configuration.nix#L39-L47
But currently, it seems to be 16 jobs in parallel, with 4 cores each.
ngi-nix/ngipkgs#1298 (comment)

With 16 heads boards getting built at the same time, their individual build times blow up to >2h. A full rebuild takes ~6h and has the CI machine more or less overloaded until it's done.