Compile workload seems to benefit from HT in general. In our software build process (extremely parallel g++ of around 9000 files, often cached by ccache), we h

Compile workload seems to benefit from HT in general. In our software build process (extremely parallel g++ of around 9000 files, often cached by ccache), we have benchmarked with all threads, and with just 1 thread per core (via "taskset", not via BIOS disabling of HT), and if we don't use the second thread on each core offered by HT, we lose 20% performance. These results are from some old CPUs (i7-4930K) and some new CPUs (TR 1950x); the 20% figure is based on the i7, and I don't have the figure handy for the TR, but I believe it showed more benefit.