On Wednesday, March 26, 2014 6:30:39 pm Dimitry Andric wrote: > Author: dim > Date: Wed Mar 26 22:30:38 2014 > New Revision: 263778 > URL: http://svnweb.freebsd.org/changeset/base/263778 > > Log: > Add a SUBDIR_PARALLEL option to bsd.subdir.mk, to allow make to process > all the SUBDIR entries in parallel, instead of serially. Apply this > option to a selected number of Makefiles, which can greatly speed up the > build on multi-core machines, when using make -j. > > This can be extended to more Makefiles later on, whenever they are > verified to work correctly with parallel building. > > I tested this on a 24-core machine, with make -j48 buildworld (N = 6): > > before stddev after stddev > ======= ====== ======= ====== > real time 1741.1 16.5 959.8 2.7 > user time 12468.7 16.4 14393.0 16.8 > sys time 1825.0 54.8 2110.6 22.8 > > (user+sys)/real 8.2 17.1 > > E.g. the build was approximately 45% faster in real time. On machines > with less cores, or with lower -j settings, the speedup will not be as > impressive. But at least you can now almost max out a machine with > buildworld! > > Submitted by: jilles > MFC after: 2 weeks
Nice! -- John Baldwin _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"