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

[Lucas De Marchi]

On Thu, Mar 5, 2015 at 10:37 PM,  <josh at joshtriplett.org> wrote:
> On Thu, Mar 05, 2015 at 10:33:19PM -0300, Lucas De Marchi wrote:
>> On Thu, Mar 5, 2015 at 9:58 PM,  <josh at joshtriplett.org> wrote:
>> > 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.
>>
>> Maybe it was a regression in libtool from 2.4.2 <-> 2.4.5?  I have 2.4.5 here:
>>
>> make -j6, libtool
>> real    4m53.924s
>> user    11m4.323s
>> sys     0m54.880s
>>
>> make -j6, dolt
>> real    1m58.653s
>> user    6m20.523s
>> sys     0m28.920s
>
> Interesting.  How easily can you try 2.4.2?

I just did it. Same speed as with dolt.

-- 
Lucas De Marchi