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- From: S_JUFFA@iravcl.ira.uka.de (|S| Norbert Juffa)
- Newsgroups: comp.os.os2.programmer,comp.os.os2.misc
- Subject: Does coprocessor speed up GUI (here: OS/2 PM)? (Summary of answers)
- Date: 2 Sep 1992 13:40:40 GMT
- Organization: University of Karlsruhe (FRG) - Informatik Rechnerabt.
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- Hi netters!
-
- Some time ago I asked here wether using a coprocessor in a 80x86 based machine
- speeds up GUIs, in particular X-Windows. So far I have gotten replies from:
- Eric Johnson (johnsone%camax01@uunet.UU.NET),
- Jerry Whelan (guru@stasi.bradley.edu),
- Arto Viitanen (av@cs.uta.fi),
- Richard Krehbiel (richk@grebyn.com)
- Thanks, guys! It seems that X-Windows originally used quite a bit of floating-
- point arithmetic in its graphics routines, in particular for operations such
- as arc drawing. However, after X11R3, most of the floating point arithmetic
- was replaced with faster integer operations. But even the current source code
- for X11R5 from MIT contains some modules that use floating point arithmetic.
- So installing a coprocessor *does* speed up the X-Windows GUI. The speed gain
- is probably not dramatical, though. I have been informed that it is quite
- easy to demonstrate the speed difference between coprocessor/ no coprocessor
- by running the X-Eyes program, which seems to use mainly arc drawing. As
- opposed to X-Windows, the MS-Windows GUI and OS/2 Presentation Manager do
- *not* use floating-point arithmetic in their graphics routines, so installing
- a coprocessor does not speed up the GUI. However, application programs can
- be sped up using a math coprocessor.
-
- Norbert
- -------------------------------------------------------------------------------
- Norbert Juffa email: S_JUFFA@IRAVCL.IRA.UKA.DE Live and let live!
-