Re: Linux 2.4.2 fails to merge mmap areas, 700% slowdown.

Dieter =?iso-8859-1?q?N=FCtzel?= (Dieter.Nuetzel@hamburg.de)
Wed, 21 Mar 2001 03:02:13 +0100

Linus Torvalds <torvalds@transmeta.com> writes:
>
> Cool. Somebody actually found a real case.
>
> I'll fix the mmap case asap. Its' not hard, I just waited to see if it
> ever actually triggers. Something like g++ certainly counts as major.

I do daily builds of the VTK CVS tree (The Visualization Toolkit,
www.kitware.com/vtk.html, a huge 3D app).

~33 MB C++ source

It took ~1 hour on my K7 550, 256 MB, IBM DTL-307030, glibc-2.2 and
gcc-2.95.2 ( 19991024 (release)) under most of the 2.4-test kernels (all with
ReiserFS) for a whole rebuild.
Now it take nearly 1 and a half hour with 2.4.2-ac20.
BTW My mouse (PS2) is very sluggished during C++ compilations, now.

I am open for all of your patches. Or should I better say most :-)))

Cheers,
Dieter

-- 
Dieter Nützel
Graduate Student, Computer Science


University of Hamburg
Department of Computer Science
Cognitive Systems Group
Vogt-Kölln-Straße 30
D-22527 Hamburg, Germany


email: nuetzel@kogs.informatik.uni-hamburg.de
@home: Dieter.Nuetzel@hamburg.de
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