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

[Michael Biebl]

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.