I'd never heard of processor sets (probably because I've never used HPUX in anger), but they sound like a great feature, especially in the days where one CPU ha

I'd never heard of processor sets (probably because I've never used HPUX in anger), but they sound like a great feature, especially in the days where one CPU had only one execution engine on it. Modern Linux has quite a lot of options for hard real time on SMP systems, some of them Free and some of them not. Of all places, Xilinx has quite a good overview: https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842435/Real-Time+Linux https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/188424...