Re: Performance issue of libtool-2.4.4

On 02/06/2015 12:12 PM, Bob Friesenhahn wrote:
> I am not seeing quite the difference between libtool releases that you are
> although I see a big slowdown starting with 2.4.3.  These timings are for
> optimized builds of GraphicsMagick on a 12-core GNU/Linux system using -j 12:

I think that we can't see obviously slowdown by "make -jN",
but "make -j1" will. And bash is much slower than dash, I'm trying to
figure out why.

>
> 2.4.2 : 23.613
> 2.4.3 : 31.697
> 2.4.4 : 28.236
> 2.4.5 : 28.514
>
> And here are timings for a non-optimize (-O0) compile with no debug symbols:
>
> 2.4.2 :  8.629
> 2.4.3 : 13.216
> 2.4.4 : 13.012
> 2.4.5 : 13.281
>
> I see similar slowdowns on an Illumos-based system, so it is not specific to
> GNU/Linux.

I'm using Ubuntu 12.04.3, we have added a few patches to libtool for cross
building, but it seems these patches won't impact the speed so much since it
works well when 2.4.2 (the same patches).

// Robert

>
> It is curious that there is more impact for the optimized builds.
>
> Bob

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