On 2016-10-01 01:59, CM Poncelet wrote:
't is Friday, so here we go again.
I wrote the following in Intel assembler in the 1990's to check the CPU-cycles
performance of DOS vs Windows 3.1 (if memory serves), using a 486/33Mhz
processor and practically all executable code loaded in the instruction cache:
<snip code>
This took approx 1'45" (elapsed) to execute under native DOS with a 80486/33Mhz
processor - i.e. there was a 1-to-1 correlation between the number of machine
instructions vs the number of actual 33Mhz CPU cycles.
I reran this under Windows XP from the 'command prompt' with a 3.2Ghz processor
(approx 100 times faster than a 33Mhz one), and it then took 3'48" to complete -
thus about 200 times longer (CPU-wise/elapsed) than when running under native
DOS.
Moral: Use native DOS (preferably with a DOS extender) for fast PC performance.
NO, NO, NO!!!
Moral, write programs that run natively. A 16-bit DOS program running in an
emulated DOS box will never run as fast as a native windoze program... Ask for a
native windoze version on <http://board.flatassembler.net/index.php> or
<http://masm32.com/board/index.php> and the program will probably run faster
than you can blink an eye.
Robert
PS: Decode the email address, you can send me copies of the .EXE's renamed to
.QQQ and in a ZIP file!
--
Robert AH Prins
robert(a)prino(d)org
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