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Re: Performance issue of libtool-2.4.4

From: Robert Yang
Subject: Re: Performance issue of libtool-2.4.4
Date: Mon, 9 Feb 2015 10:45:58 +0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.3.0

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 <address@hidden>
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.


   2.4.2 : 3:43.43
   2.4.5 : 4:33.11


   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.


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