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Add a SUBDIR_PARALLEL option to bsd.subdir.mk, to allow make to process

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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
This commit is contained in:
Dimitry Andric 2014-03-26 22:30:38 +00:00
parent 1632bf1a88
commit 54ff5d7323
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=263778
7 changed files with 33 additions and 0 deletions
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2
bin/Makefile
View File

@ -60,4 +60,6 @@ SUBDIR+= tests
SUBDIR:= ${SUBDIR:O}
SUBDIR_PARALLEL=
.include <bsd.subdir.mk>

4
lib/Makefile
View File

@ -276,4 +276,8 @@ afterinstall:
${INSTALL_SYMLINK} ../include ${DESTDIR}/usr/lib/include
.endif
.if !make(install)
SUBDIR_PARALLEL=
.endif
.include <bsd.subdir.mk>

2
lib/clang/Makefile
View File

@ -147,4 +147,6 @@ SUBDIR+=liblldb \
SUBDIR+= include
SUBDIR_PARALLEL=
.include <bsd.subdir.mk>

2
sbin/Makefile
View File

@ -126,4 +126,6 @@ SUBDIR+= tests
SUBDIR:= ${SUBDIR:O}
SUBDIR_PARALLEL=
.include <bsd.subdir.mk>

19
share/mk/bsd.subdir.mk
View File

@ -71,7 +71,26 @@ ${SUBDIR}: .PHONY .MAKE
.for __target in all all-man checkdpadd clean cleandepend cleandir \
cleanilinks depend distribute lint maninstall manlint obj objlink \
realinstall regress tags ${SUBDIR_TARGETS}
.ifdef SUBDIR_PARALLEL
.for __dir in ${SUBDIR}
${__target}: ${__target}_subdir_${__dir}
${__target}_subdir_${__dir}: .MAKE
@${_+_}set -e; \
if test -d ${.CURDIR}/${__dir}.${MACHINE_ARCH}; then \
${ECHODIR} "===> ${DIRPRFX}${__dir}.${MACHINE_ARCH} (${__target:realinstall=install})"; \
edir=${__dir}.${MACHINE_ARCH}; \
cd ${.CURDIR}/$${edir}; \
else \
${ECHODIR} "===> ${DIRPRFX}${__dir} (${__target:realinstall=install})"; \
edir=${__dir}; \
cd ${.CURDIR}/$${edir}; \
fi; \
${MAKE} ${__target:realinstall=install} \
DIRPRFX=${DIRPRFX}$$edir/
.endfor
.else
${__target}: _SUBDIR
.endif
.endfor
.for __target in files includes

2
usr.bin/Makefile
View File

@ -379,4 +379,6 @@ SUBDIR+= svn
SUBDIR:= ${SUBDIR:O}
SUBDIR_PARALLEL=
.include <bsd.subdir.mk>

2
usr.sbin/Makefile
View File

@ -320,4 +320,6 @@ SUBDIR+= wpa
SUBDIR:= ${SUBDIR:O}
SUBDIR_PARALLEL=
.include <bsd.subdir.mk>