[systemd-devel] [PATCH] use dolt.m4 to speedup compilation

[josh at joshtriplett.org]

On Fri, Mar 06, 2015 at 12:55:38AM +0100, Michael Biebl wrote:
> 2015-03-05 11:58 GMT+01:00  <harald at redhat.com>:
> > From: Harald Hoyer <harald at redhat.com>
> >
> > The speedup is significant
> >
> > Original libtool
> > $ ccache -C && make clean && time make -j4
> > […]
> > real    6m4.104s
> > user    13m49.234s
> > sys    7m37.864s
> >
> > Original libtool + dolt
> > $ ccache -C && make clean && time make -j4
> > […]
> > real    2m24.869s
> > user    7m30.198s
> > sys    1m17.813s
> 
> Hm, the speedup is nowhere near as significant here:
> without dolt (make):
> real 4m2.749s
> user 3m9.304s
> sys 0m19.032s
> 
> with dolt (make):
> real 3m33.756s
> user 2m59.476s
> sys 0m17.632s
> 
> without dolt (make -j6):
> real 1m42.001s
> user 5m3.680s
> sys 0m26.608s
> 
> with dolt (make -j6)
> real 1m35.267s
> user 4m50.956s
> sys 0m24.724s
> 
> 
> libtool version is 2.4.2.

That's more what I'd expect with current versions of libtool, which has
supposedly fixed many of the issues that motivated the creation of dolt
in the first place.

- Josh Triplett