Subj : Re: scrolling slower in 32 bits mode than in 16.
To   : borland.public.cpp.borlandcpp
From : Morosh
Date : Mon Mar 14 2005 11:10 pm


Morosh <morisaab@yahoo.fr> wrote in message
news:4231b7cd@newsgroups.borland.com...
>
> Bob Gonder <notbg@notmindspring.invalid> wrote in message
> news:hcc131dqt6r66kipj3rs3lu6t3j1dmiudi@4ax.com...
> > Morosh wrote:
> >
> > >I wrote a program and I was compiling it in 16 bits mode using bcc
> (borland
> > >v5.02)
> > >I tried  to compile with bcc32 (as there is less problem for data
space)
> > >It worked but the scrolling was very much slower than with bcc.
> > >
> > >To isolate the problem, I wrote a very simple program to test the
> scrolling:
> > >
> > >#include "stdio.h"
> > >void main()
> > >{
> > >int i;
> > >for(i=32;i<1024;i++) printf("%i ",i);
> > >}
> >
> > >My question is: is there a way to have scrolling under 32bits as fast
as
> > >under 16 bits
> >
> > See if this is any faster (not tested)?
> >
> > #include <windows.h>
> >
> > int main()
> > {
> > int i;
> > DWORD byteswritten;
> > char msg[64];
> > HANDLE stdout = GetStdHandle(STD_OUTPUT_HANDLE);
> >
> >
SetConsoleMode(stdout,ENABLE_PROCESSED_OUTPUT|ENABLE_WRAP_AT_EOL_OUTPUT);
> >
> > for(i=32;i<1024;++i)
> > { wsprintf( msg, "%i", i );
> > WriteFile(stdout,msg,lstrlen(msg),&byteswritten,NULL);
> > };
> > return 0;
> > }
> > In my own app, I completely control the screen, never scroll, and turn
> > off WRAP_AT_EOL. I also don't use any C/C++ console functions, using
> > pure Win32 API. (My clear screen is about 10 times faster than the CRL
> > version).
> >
> > >I compiled it with bcc: bcc -4 -ff -N -ml test.cpp
> > >and with bcc32: bcc32 -6 -fp -N -d test.cpp
> >
> > -ff and -fp are floating point, and have no affect on this program.
> > I can't find a -N switch for bcc32
> > You should also specify the target:  -WC
> > And, when you get into bigger programs, look to add  -O2 -Oi -OS -Ov
> >
> >
>
> Hi:
> I tried your code, the result is the same, but I noticed that the
difference
> is only under WIN98 (16bits is faster than 32 bits), under WIN XP both are
> identical and slow like 32bits mode under 98.
> any idea?
>
> thanks
>
>
>
>
In fact, I had misexplained, the problem comes from printf itself, the
printing is 10 times slower (not exactly the scrolling).
in mode 16bits (bcc), one screen page display instantly
in mode 32bits (bcc32), you could see the characters displaying (quickly)
one by one but not instantly.


Morosh

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