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- One of the trade-offs of multi-tasking on the PC, is some speed degradation in
- the active applications. When and why this occurs, and how to minimize it, was
- discussed at length.
-
-
- Fm: Gary Saxer (Quarterdeck) 73206,564
- To: DESQview bkg COMM users
-
- Another note concerning DESQview and speed. A DOS Services window with a
- directory displayed is constantly getting time allocated to it. You might try
- ^NumLock on the window, this freezes that window. (See your manual folks, look
- around page 30). I might also point out that 1-2-3 does a lot of "work" when
- you think it is just sitting there! It constantly checksums itself when
- "nothing else" is going on. A ^NumLock to an idle 1-2-3 window does wonders!
-
-
- Fm: PETER MCKINNEY 74166,1301
- To: Michael Rothman 74405,1313
-
- One of the reasons I wanted DV was to be able to print or compile in the
- backgound partition(s) and use a foreground partition for MultiMate. I have
- tried this with the TYPE command in the DOS(128K) partition and the computer
- does not return to me until TYPE is finished. In other words;
-
- ACTION TSR's DV
- Ability to perform DOS operations
- from within a program x x
- Backgound printing n/a ?
- Background communications n/a ?
- Compile in background, edit in fore n/a ?
- have a notepad readily available x x
- have a calculator readily available x x
- Any thoughts ?
-
-
- Fm: Steve Kalman 75136,360
- To: PETER MCKINNEY 74166,1301
-
- I am currently printing in the BG while writing this, and if all goes well,
- I'll be doing the uploading too (if it fails, I'll come back with another
- message).
-
- I have a print spooler running in extended memory, and while the file was
- spooling, all else was halted, but once it was done, the system came active
- again. I'm not sure what will happen if the spooler was off. Also, the print
- was done via the COPY FOO.BAR LPT1
-
-
- Fm: Steve Kalman 75136,360
- To: Jim Butler 74766,1460
-
- I, too, have a spooler working (Superspool from AST). It's running in EXTENDED
- memory on the Advantage card (along with VDISK). When an application writes to
- the spooler, everything else waits (e.g., COPY BIGFILE.TXT LPT1) until the
- spooler gets it all (and if the spooler is too small, everything waits until
- the file finishes writing into the spooler - I reset mine to be 400K) Once
- that's done, the printer prints (but much slower than ever before -
- subjectively at about 3/4 speed) and the other partitions become accessible.
-
-
- Fm: Earle Robinson 70135,141
- To: Steve Kalman 75136,360
-
- I have also noted about a 10% speed degradation on the at. By the way, why did
- you reboot to rerun the test? You can merely exit dv, or am I missing
- something?
-
-
- Fm: Steve Kalman 75136,360
- To: Earle Robinson 70135,141 (X)
-
- Yes, you can just exit DV; when doing benchmarks, I like to make sure that
- everything is constant except for the variation that I'm testing. Although in
- this case I doubt if there would be any difference the extra few seconds for
- the re-boot was just for insurance.
-
-
- Fm: Ben Klausner 70340,374
- To: Steve Kalman 75136,360
-
- A couple of days prior to installing DV, I souped up my AT to 9 MHz, so maybe
- I have enough improvement to compensate for the time overhead DV requires. Also
- have a copy on the Z-150 at home, but haven't had time to use that enough to
- tell about speed lags. Also, recently put a V-20 in that, so it may help too.
-
-
- Fm: Jim Butler 74766,1460
- To: Richard P. Wilkes 72746,1712
-
- Richard, I find DV helpful for exactly the applications you mention. I also
- find that Lightning ( the disk speed enhancer) makes a *tremendous* difference
- in the speed of running big rbase applications. I might like to compare notes
- with you on some rbase stuff ... what kinds of things do you do with it?
-
-
- Fm: Norm Lew 70047,3340
- To: Conrad Kageyama (Sysop) 76703,1010
-
- I find this whole discussion somewhat amusing. With DesqView, I can
- simultaneously download and perform other tasks, resulting in an additional
- 20-25 work hours per month. I have CED wherever I wish. I can have a matching
- keyhandler loaded in each window should I desire, or if my needs in a
- particular window don't warrant a sohpisticated macro program, I can use DV
- macros. Running SideKick in a separate window is not so terrible. DV's cut &
- paste is better than SideKick's. I would rather do two tasks at 90% of optimum
- speed than one at 100% To top it all off, I don't have use DV if don't want to.
-
-
- Fm: Howard Benner 75676,1624
- To: Jim Butler 74766,1460
-
- Intuitively, why shouldn't dv slow things down? If the computer is
- trying to do a sort in R5K, send and receive messages with ATO, and allow you
- to work on a document in WP all at the same time, it seems logical that there
- would be some degradation of performance, compared to running just one task.
- If the computer works at, say, 67-75% under the scenario above, I'd be
- satisfied.
- Put another way, let's say the ATO and R5K tasks each took exactly an
- hour, and that you spent an hour working on a WP document. That's 3 hours
- without dv. With all three going at once, and with 25% degredation, ATO and
- R5K would take the same 1.33 hours to accomplish their tasks. Arguably, you'd
- still complete the WP task in one hour. That means one hour at the kbd and a
- 20-minute coffee break to accomplish what, without dv, would have taken
- 3-hours. To a purist, that may be unacceptable for multitasking, but it sounds
- pretty good to me.
-
-
- Fm: Paul Ferrara 70075,252
- To: Earle Robinson 70135,141 (X)
-
- Speed will be a problem for those on PC/XT's who desire to run applications in
- the background. But just think, if you were running a "stock" AT, you could
- probably now go to a faster crystal and never notice the difference.
-
-
- Fm: Gary Saxer (Quarterdeck) 73206,564
- To: Jim Butler 74766,1460 (X)
-
- No, it does not make them go faster. As shipped by IBM (and clones) the
- hardware interrupt priority puts the keyboard on "top". DESQview has an option
- which lets us tell the hardware to make interrupt 2 the highest. Thus a COMM
- interrupt will now occur before a keyboard or disk interrupt, and this helps
- avoid lost characters. TopView does the same thing. Note that any program
- which played with this by itself would render itself unrunnable (is that a
- word?) in either "View" program as well as on some clones where you can't
- change the priorities.
-
-
- Fm: Gary Saxer (Quarterdeck) 73206,564
- To: Jim Butler 74766,1460
-
- DMA is Direct Memory Access. This means that (in this case) the disk
- controller is allowed to directly place its data into memory without the CPU
- touching each byte. The Lightning product from PCSG does this into expanded
- memory. This is a no-no in DESQview since the expanded memory map can change
- at any time. PCSG is aware of this, further info to follow I hope.
-
-
- Fm: Steve Kalman 75136,360
- To: Ben Klausner 70340,374 (X)
-
- Performance adjustemets or not, DV definitely does slow the system. As a test,
- I adjusted the performance ratio to 99:1, started dbase3 in the first (largest)
- window, and reindexed a 4000 record file Time 3:40 (on an AT). Then I re-booted
- without DV and did the same reindex; time 3:00. I'm not terribly pleased; but I
- can live with it considering the other advantages it brings me.
-
- I'll try to find time to do this over using a RAM disk for the DBF & NDX - said
- RAMdisk in Extended memory.
-