Re: Performance issue of libtool-2.4.4

On 02/06/2015 10:46 PM, Bob Friesenhahn wrote:
> On Fri, 6 Feb 2015, Robert Yang wrote:
>
>>
>>
>> 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.
>
> It seems like this issue is already corrected in the source tree but you are

Yes, I think that the git repo has fixed the problem:

commit 408cfb9c5fa8a666917167ffb806cb19deded429
Author: Gary V. Vaughan <[email protected]>
Date:   Fri Feb 6 12:58:34 2015 +0000

     libtool: don't execute automake and autoconf on every invocation.

// Robert

> correct that the issue is much more apparent with -j1.
>
> Optimized:
>
>    2.4.2 : 3:43.43
>    2.4.5 : 4:33.11
>
> Non-Optimized:
>
>    2.4.2 : 1:21.21
>    2.4.5 : 2:05.48
>
> We need a test case which is executed before every major release to make sure
> that a performance regression has not been introduced.
>
> Bob

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