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Using Multiple CPU Cores in DOS? (Miscellaneous)

posted by bretjohn(R) Homepage E-mail, Rio Rancho, NM, 14.09.2011, 18:24

> BTW how do you measure CPU mode switch? Do you have some small util for
> this? I could test it on my C2D E8400 how fast will it be...

What I do is measure how long it takes to do a small INT 15.87 memory transfer. The only parts that should be involved in an INT 15.87 transfer outside of the pair of time-consuming mode switches are some initialization, a REP MOVSx, and some clean-up, which are all minimal in time consumption.

I don't have a separate utility for that -- right now it's just integrated into the programs that need to know how long it takes.

 

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