Am 02.11.2011 07:54, schrieb Wolfgang Denk: > U-Boot Makefiles contain a number of tests for compiler features etc. > which so far are executed again and again. On some architectures > (especially ARM) this results in a large number of calls to gcc. > > This patch makes sure to run such tests only once, thus largely > reducing the number of "execve" system calls. > > Example: number of "execve" system calls for building the "P2020DS" > (Power Architecture) and "qong" (ARM) boards, measured as: > -> strace -f -e trace=execve -o /tmp/foo ./MAKEALL<board> > -> grep execve /tmp/foo | wc -l > > Before: After: Reduction: > ================================== > P2020DS 20555 15205 -26% > qong 31692 14490 -54% > > As a result, built times are significantly reduced, typically by > 30...50%. > > Signed-off-by: Wolfgang Denk<w...@denx.de> > Cc: Andy Fleming<aflem...@gmail.com> > Cc: Kumar Gala<ga...@kernel.crashing.org> > Cc: Albert Aribaud<albert.arib...@free.fr> > cc: Graeme Russ<graeme.r...@gmail.com> > cc: Mike Frysinger<vap...@gentoo.org> > ---
Nice. Some additional numbers: zmx25: make ----------- real 1m47.546s 0m57.213s -53% user 1m39.698s 0m54.831s sys 0m24.798s 0m9.509s zmx25: make -j2 --------------- real 0m56.791s 0m32.187s -57% user 1m38.478s 0m55.571s sys 0m24.522s 0m9.513s Tested-by: Matthias Weisser <weiss...@arcor.de> Matthias _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
