Edit: Mystery solved — see the end
The hosts are identical — motherboards, memory, processors — yet one machine is 43% faster than the others, consistently, on a simple compile benchmark with everything on a ramdisk.
cpuinfo data is here. That should cover all questions about the hardware and processor configuration, I think.
Kernels are identical (all
I’ve no idea, but I’m starting to doubt my own sanity now!
Edit: Mystery solved:
It turned out to be a difference in the OCaml compiler versions installed. On the “fast” machine I had installed the new compiler, which it turns out is quite a bit faster.