Hi Tom
I think the emulation speeds achieved by both QEMU and DOSEMU2 are
excellent. In this instance whether it takes 0.2 second or 1.5 seconds
is really irrelevant.
As an aside, when I recently added an SSD to my HP notebook, year 2006
vintage, only a small improvement in speed was gained, suggesting that
the limitation being the disk controller. The Toshiba, year 2012
notebook on the other hand flies with an SSD.
As another comparison to show how good the QEMU and DOSEMU2 emulators
are, running the same test with VDOS under XP, results in a speed
difference of 16 times slower.
John
On 2025/03/12 14:34, tom ehlert wrote:
Hi John,
am Dienstag, 11. März 2025 um 17:52 schrieben Sie:
DOSEMU2 runs about 4.5 to 6.5 times slower compared to MS DOS 5 on an ancient
XP PC (VDM). FreeDos 1.2 under Qemu runs 5.6 to 8.6 times slower.
This is completely expected. Your application (assembling 150 tiny assembly
files) is completely file-I/O bound.
On Windows XP you are essentially running entirely on a RAM disk. And nothing
beats a RAM disk in file-I/O.
And - before someone asks - 'MSDOS 5 on XP VDM' isn't MSDOS 5.0, similar to
WINE isn't Windows.
Tom
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