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DAPERF.FAX
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1994-12-02
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OS/2 2.x CPU PERFORMANCE FOR DOS APPS 7/18/94
FILE: OSDAPERF.FAX - 5/11/94
TITLE: 940511 OS/2 2.x CPU PERFORMANCE FOR DOS APPLICATIONS
RUNNING IN A MULTITASKING VIRTUAL DOS MACHINE
(VDM) ENVIRONMENT
DESCRIPTION OF SYMPTONS:
DOS APPLICATIONS PERFORMING SLOW IN A VDM
SUMMARY OF RESOLUTION:
There is only one CPU in the computer. When the CPU
processes for one program you will get maximum performance.
When you have that same CPU doing many other tasks at the same
time as doing the dedicated process, you can expect a
performance degradation. It is the same CPU now doing many
more things other than the one thing it was doing before,
therefore, there will be slower speed.
VDMs do not offer CPU acceleration and OS/2 does not
accelerate your CPU. OS/2 utilizes the idle time of your CPU
much better and allows for users to continue working on other
things while a spreadsheet calculates, thus allowing customers
to use their computer, while under DOS that computer would be
tied up doing the calculation and not usable. If VDM
priorities were able to be increased in a future release of
OS/2, then the customer could allocate more processing time to
the spreadsheet session.
Hopefully, in a future release of OS/2, there will be a
DOS-SETTING that allows setting of VDM priorities by the
customer instead of hard coded by the operating system. Even
at that time, the CPU will still be doing some other things in
the background, but performance for that DOS session will be
increased.
Report by: OS/2 Dosap Analyst Team - 05/94
IBM - Boca Raton, Florida
12/31/99