Honestly something like a Linux Kernel compilation would be the most straightforward, static and consistent method to test it out. Just have a basic environment

Honestly something like a Linux Kernel compilation would be the most straightforward, static and consistent method to test it out. Just have a basic environment without overhead (like Alpine Linux) with GCC or LLVM/Clang sitting on a USB key, use GNU time to measure the execution of your command, redirect to a log file and you're done. user@host$ (time make -j[insert number of threads]) 2>logfile.txt