Hi John,
your task is assembling multi-file assembly language sources.
That reminds me of speeding up complex C project compiles in DOS.
Depending on how your tools work, you may want to try to run the
task in a RAMDISK for comparison. Copy the source files there,
assemble everything, copy the binary back. Might be much faster
than assembling on a physical SSD or even harddisk FAT partition,
even when loading a DOS disk cache.
If you use FAT32 and/or long file names, things may get slower.
When you use emulators in Windows or Linux, things may be much
faster, because the physical filesystem is managed by Windows
or Linux, with advanced caches and filesystems like NTFS or
ext4fs which are far more modern than classic FAT for DOS.
If your assembler produces much output on the screen, try to
use NANSI instead of ANSI, or maybe do not load ANSI at all.
The bandwidth of your RAM and SSD, as well as the IOPS of your
SSD, may also be relevant when comparing WinXP to Linux etc.
I assume QEMU uses a single file disk image to create the disk
on which your DOS runs, while DOSEMU2 defaults to redirection
of Linux directories. However, you can also configure DOSEMU2
to use disk images, so you could create a disk image D: drive
next to your normal DOSEMU2 C: drive and compare their speeds.
In addition, you can compare different filesystems to put
the Linux directory or the disk images in Linux or Windows.
If your assemblers use lots of small disk writes, Ext4fs or
XFS with journaling might be slower than ext2fs without it.
Even tuning tricks such as those for databases may help you:
https://virtual-dba.com/blog/linux-os-and-file-system-tuning-for-database-servers/
Regards, Eric
MS XP PC
Hardware. Year approx. 2006. HP NC6320 Notebook. CPU Core 2 Duo T7200 @
2GHz. RAM 2GB Dual channel DDR2 @ 332 MHz. Storage SSD.
OS. Win XP Prof. 32bit SP3. Partition size. Drive C: 50GB NTFS
MSDOS 5 with 4DOS
...
Linux PC
Hardware. Year approx 2012. Toshiba Satellite C850-F21E Notebook. CPU
Intel Core i3-2350M. 2.4GHz. 64 bits. RAM. 4GB. Storage SSD.
OS. Linux Mint xfce 22.1 64 bits.
Both QEMU and DOSEMU2 use KVM.
...
> 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. ...
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