On Aug 23, 2017, Richard Biener <richard.guent...@gmail.com> wrote:
> Just curious if, for example, --with-build-config=bootstrap-lto
> --enable-languages=c
> --disable-multilib and make -j1 shows any difference in time and/or peak
> memory
> use (the interesting peak memory use is that of the WPA phase).
$ ../configure --enable-languages=c --disable-multilib \
--with-build-config=bootstrap-lto -C
$ make -jN
$ cd gcc
$ make clean
$ /bin/time make -j1
3860.82user 92.39system 1:06:12elapsed 99%CPU (0avgtext+0avgdata
952460maxresident)k
0inputs+2338008outputs (0major+53550802minor)pagefaults 0swaps
$ make clean
$ /usr/bin/time make -j1 \
C{,XX}FLAGS='-g -gno-statement-frontiers -O2 -flto=jobserver -frandom-seed=1'
-> error, lto fails to drop inline entry stmts from libiberty.a; will fix,
meanwhile:
$ cd ..
$ make stage1-start
$ rm -rf stage3-*
$ echo > ../config/bootstrap-noSFN3.mk 'STAGE3_CFLAGS +=
-gno-statement-frontiers'
$ make -jN BUILD_CONFIG='bootstrap-noSFN3 bootstrap-lto'
$ cd gcc
$ make clean
$ /bin/time make -j1
3587.09user 88.11system 1:01:46elapsed 99%CPU (0avgtext+0avgdata
948800maxresident)k
0inputs+1937200outputs (0major+46685269minor)pagefaults 0swaps
--
Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/ FSF Latin America board member
Free Software Evangelist|Red Hat Brasil GNU Toolchain Engineer
