In response to Ed Schouten <ed_at_fxq.nl>: > * Ian FREISLICH <ianf_at_clue.co.za> wrote: > > As an aside, a 64 way parallel make buildworld doesn't saturate the CPU. > > I'm not sure, but I think if you do this: > > make -j64 <foo> > > it only spawns 64 processes to handle the top level make process. This > would mean we've got a couple of processes doing this: > > make -C bin > make -C lib > make -C sbin > make -C usr.bin > make -C usr.sbin > > and the other processes will just quit, because they don't have anything > to do. Right? :-) Basically, -j tells make the _maximum_ number of jobs to run in parallel. I frequently do -j99, but I've never seen more than about 20. You can't just look at it for a second, either. Certain parts of the build process have more parallelism available than others, so you might look at it at a point where there are only a few. If you really want to saturate it, copy the src tree a few times and start a make -j99 buildworld in all of them simultaneously :D -- Bill Moran http://www.potentialtech.comReceived on Wed Feb 13 2008 - 13:27:19 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:39:27 UTC