[vtk-developers] RE: FYI --- Re: RE: [Cmake] Win32 "Blended" processor vs Pentium

[Miller, James V (CRD)]

I wouldn't expect the sphere benchmark to indicate any performance change.  There is very little
computation in the sphere bench.  It is mostly rendering limited.

Now if you were using Mesa as the renderer, then building Mesa with these processor optimization may
produce a change.

The real test would be to see if volume rendering, marching cubes, decimation, polydata smoothing,
gaussian smoothing accelerate with the different processor optimizations.


-----Original Message-----
From: anast.jm at pg.com [mailto:anast.jm at pg.com]
Sent: Tuesday, November 06, 2001 9:59 AM
To: Miller, James V (CRD)
Cc: Vtkdevelop (E-mail)
Subject: FYI --- Re: RE: [Cmake] Win32 "Blended" processor vs Pentium



Jim, I tried compiling with processor optimization under MSVC6 on a dual P$ NT
box with a very recent CVS nightly for VTK and did not find any speed up when
building the debug or release versions. I also tried optimizing for both the
Pentium setting and Pentium Pro setting but neither seemed to make any
difference with the Simple Sphere Benchmark. Perhaps this bench is not sensitive
to these optimizations??

regards, john


<<snip snip>>


From: "Miller, James V (CRD)" <millerjv at crd.ge.com>@public.kitware.com on
11/05/2001 08:54 AM

Subject:      [Cmake] Win32 "Blended" processor vs
Sent by:  cmake-admin at public.kitware.com   11/05/2001 08:54 AM


Stephen Alyward mentioned the  other day that he has seen as much as a 2X
performance improvement if VC++ is  set to create instructions for the Pentium
processor as opposed to the "Blended"  mode which is the current default.

Has anyone else seen such  performance increases switching from "blended" to
"pentium"?

Should CMake support changing  this setting? Or perhaps should we just the
default to be compile for  Pentium?  Are we worried about building applications
for people with 486's?  (I am currently getting pressure to pull machines with
less than a Pentium II  off our network :)


Jim Miller
_____________________________________
Visualization & Computer Vision
GE  Corporate Research & Development
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millerjv at crd.ge.com <mailto:millerjv at crd.ge.com>
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Cell: (518) 505-7065,  Fax: (518) 387-6981