Interesting how compilation benchmarks do not scale at all from 24 to 32 to 64 core Threadrippers. Neither Linux kernel nor LLVM compilation. I wonder why it's so bad.
At some point when you build LLVM.with the default options, you hit a moment where most of what's left to do is linking a number of executables, all statically linking libllvm.a. They are all relatively slow to link, and there aren't enough of them to fill 32 or 64 cores. And they require a lot of RAM, so if you don't have enough RAM, you might end up swapping too.
Showing some curiosity might help. When you learn to profile and dig deeper, you will be able to understand what's going on, troubleshoot it and find the bottleneck(s). I remember the kernel compiling in sub-10 seconds on Egenera's multi-million dollar quad-socket blade racks a decade ago. Given the computing power, memory speed, bus speed, SSD performance and code-size today, there's no material reason similar figures shouldn't be attainable today.
