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54ff5d7323
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
66 lines
673 B
Makefile
66 lines
673 B
Makefile
# From: @(#)Makefile 8.1 (Berkeley) 5/31/93
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# $FreeBSD$
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.include <bsd.own.mk>
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SUBDIR= cat \
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chflags \
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chio \
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chmod \
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cp \
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date \
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dd \
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df \
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domainname \
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echo \
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ed \
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expr \
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freebsd-version \
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getfacl \
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hostname \
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kenv \
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kill \
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ln \
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ls \
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mkdir \
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mv \
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pax \
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pkill \
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ps \
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pwait \
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pwd \
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realpath \
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rm \
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rmdir \
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setfacl \
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sh \
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sleep \
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stty \
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sync \
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test \
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uuidgen
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.if ${MK_RCMDS} != "no"
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SUBDIR+= rcp
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.endif
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.if ${MK_SENDMAIL} != "no"
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SUBDIR+= rmail
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.endif
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.if ${MK_TCSH} != "no"
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SUBDIR+= csh
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.endif
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.if ${MK_TESTS} != "no"
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SUBDIR+= tests
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.endif
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.include <bsd.arch.inc.mk>
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SUBDIR:= ${SUBDIR:O}
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SUBDIR_PARALLEL=
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.include <bsd.subdir.mk>
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