On Fri, Aug 11, 2023 at 2:01 AM Martin Husemann <mar...@duskware.de> wrote: > > On Thu, Aug 10, 2023 at 02:13:12PM -0700, Kevin Bowling wrote: > > When running something heavy yet ephemeral like a parallel make, I can > > see expected CPU usage in the summary or per-cpu view. However, I > > rarely see the process(es) consuming the CPU momentarily during the > > update intervals reflected accordingly in the per process view below. > > I find the behavior somewhat surprising compared to FreeBSD top(1) and > > am wondering what the difference is. > > You mean you often don't see the process with STATE CPU/0 (or some other > cpu)?
Hi Martin, A real example is doing a -j 8 kernel build. Up in the top of top(1), I see global CPU usage in the high 90%. Down in the process list, I see a few processes in the 1-10% range that do not add up to 800%. I see some of the cc1 processes with 0% WCPU%/CPU%. > Maybe FreeBSD uses a different default sort - you could try experimenting > if you get similar display with something like "top -o ..." and various > sort fields. I checked these fields out, sorting by cpu for instance and see the same deal. I checked FreeBSD and Linux and they don't get it perfect.. the former seems to have slightly better accounting of momentary processes down in the process list somehow though. > Martin
