Subj : Re: scrolling slower in 32 bits mode than in 16.
To   : borland.public.cpp.borlandcpp
From : Morosh
Date : Fri Mar 11 2005 05:22 pm


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

.