Interesting.<p>Never worked on mainframes myself, but have on Unix (and Linux) a lot.  Had read some years ago that mainframes had some powerful features that were often not available on Unixes. One such feature that <i>was</i> available, could be HP&#x27;s PRM (Process Resource Manager), which, IIRC (from my time at a HP joint venture), could ensure allocation of a guaranteed minimum percentage of system resources (such as RAM and CPU time) to a specific process (say a payroll job running at the end of the month). I remember being impressed by the concept at the time.<p>There was also HP MC&#x2F;Service Guard, but didn&#x27;t have a good idea what it did, just remember the name.<p>P.S. Had also tried out rtprio and prioc(n)tl on some Unix boxes, maybe one was an HP one, the other a SVR4. They allowed assigning (quite) higher priorities to specified processes, IIRC.<p>P.P.S. Both those product names could have been changed by now, or been merged into bigger products, as sometimes happens.<p>Edited to say that HP&#x27;s PRM _was_ an example of a mainframe-like feature.