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- Does your friend's 386-12 computer seem do some calculations as
- fast as your demon 386-25? It might not be your imagination if
- your friend is either pretty sophisticated or pretty naive.
-
- Here's why.
-
- If you've got a 386 with, say 2-4 MB, you probably have some of
- that extra memory devoted to a disk cache and a virtual disk
- using an expanded memory manager. On my system these files are
- called SMARTDRV.SYS, RAMDRIVE.SYS, and QEMM.SYS respectively. The
- first two are part of MS-DOS 4.01. QEMM comes from Quarterdeck
- (the MS-DOS "semi-equivalent" is called EMM386.SYS). All are
- called from the CONFIG.SYS file. I also run 4DOS, the *much*
- superior replacement for COMMAND.
-
- Here are the some relative performance figures under three boot
- scenarios:
-
- Scenario 1: My "raw" system using COMMAND, no CONFIG.SYS, no
- AUTOEXEC.BAT.
- !!!!!!!!!!!! Relative speed 100%.
-
- Scenario 2: My system using 4DOS, RAMDRIVE.SYS, SMARTDRV.SYS,
- QEMM.SYS plus four or five TSR's.
- !!!!!!!!!!!! Relative speed 51%.
-
- Scenario 3: My system using COMMAND, RAMDRIVE.SYS, SMARTDRV.SYS,
- EMM386 plus the same TSR's.
- !!!!!!!!!!!! Relative speed 39%.
-
- Scenario 4: Desqview? You don't want to ask.
-
- Note these things. This is pure CPU time, not counting disk
- access. For many operations the disk cache and ramdisk would
- make up for lots of CPU cycles. Surprizingly the TSR's were not
- the main culprits, causing less than 10% of the degredation. "My
- system" is a 386 clone, with a Norton SI of averaging about 26.
-
- (As an aside, a little program called CLOCK.COM or maybe CGCLOCK.COM
- took a full 25% of the CPU's just to put the time in the upper
- right-hand corner of the screen. So maybe it costs a lot to know
- what time it is. So see PRMPT.ZIP -- or some such name -- to get the
- time free most of the time.)
-
- Anyhow, I conclude that for very heavy number-crunching it might
- be best to go "bare." Frankly, I was *amazed* at these results.
-
- To test this on your own system download OVERHEAD.ZIP, available
- on EXEC-PC. This program and this "problem" are not often mentioned.
- (To: Peter Norton -- otta be a way to make a buck on this fact.)
-
- So, to finish the point made in the first paragraph, your
- sophisticated friend might disable the fancy stuff for heavy duty
- work while your naive friend would never install those drivers
- at all.
-
- --Jack Pearson
- (John Pearson on EXEC)
- 7/22/90
-