Re: Performance issue of libtool-2.4.4

[Bob Friesenhahn]

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 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
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/