Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!nstn.ns.ca!news.cs.indiana.edu!julius.cs.uiuc.edu!rpi!zaphod.mps.ohio-state.edu!samsung!munnari.oz.au!csc.anu.edu.au!manuel!ccadfa!prolix!dac From: dac@prolix.ccadfa.oz.au (Andrew Clayton) Newsgroups: comp.sys.amiga.graphics Subject: Mandelbrot Madness Keywords: Mandelbrot Message-ID: <18986df1.ARN27d8@prolix.ccadfa.oz.au> Date: 28 Jan 91 13:00:01 GMT References: <1991Jan11.233512.1@vax1.mankato.msus.edu> <18834185.ARN09718@prolix.ccadfa.oz.au> <188483a4.ARN09773@prolix.ccadfa.oz.au><1991Jan27.074838.10517@watdragon.waterloo.edu> Reply-To: ccadfa.cc.adfa.oz.au!prolix!dac@munnari.OZ.AU Followup-To: comp.sys.amiga.graphics Organization: I'm not an Organization - I'm a person! Lines: 55 In article <1991Jan27.074838.10517@watdragon.waterloo.edu>, Colin Plumb writes: > > In article , Hannu Napari writes: > > > >> Maximum of 1024 iterations is far too little. > > ccadfa.cc.adfa.oz.au!prolix!Dac wrote: > > > >Picky picky. :-). > > > >I find that 1024 is just too slow (and that's on a 30Mhz 68030/68882). > > > >Just how deep into the Mandelbrot set are you going anyway? Past a certain > >point, it's all self referential and derivative anyway! Anything at 256 > >iterations is cool enough for moi! > > Wimp. It is a fact of life that, however much processing speed you have, > you're always going to start generating pictures that take over 20 minutes. Is this some 'aha' experience speaking, or a general truism that you've decided to espouse without using anything firm like facts? :-) > Of course, the last Mandelbrot demo I wrote was for a 28-processor transputer > system, so I had it in places where 15,000 iterations was too fuzzy; I had > to go to 17,000. At 513x513 resolution, this wrapped the flops counter > past 2^32. Right. (512^2) * 17000 = 4.4*10^12 flops. Therefore you are saying that you were doing a screen a second? (what's 'a' flops, hmm?). A 4Gflops machine is very bloody fast. > I had to switch to a floating point flops accumulator! > (Actually, I counted z^2+c iterations and scaled the number of seconds > to produce statistics. But 16,000 times a quarter of a million is 4 billion: > wrap!) > > Really, there are some great spots I couldn't find with lower iteration > levels around n=5,000. Madness. Sheer madness. The TV special 'Chaos' had some pretty spiffy Mandebrot animations, that looked real-time (just going down seahorse valley, seemingly forever). I did n=4000 on MandFXP, and it just took AGES (this was in a window about 50 pixels by 20 pixels!). Tranputerising it would be kinda neat to see, but wasting one's life (and CPU) on looking at the Mandelbrot set, seems kind of a waste to me. C'est la vie. > -Colin Dac -- _l _ _ // Andrew Clayton. Canberra, Australia. I Post . (_](_l(_ \X/ ccadfa.cc.adfa.oz.au!prolix!dac . . I am. -------- I cannot send or receive email. Not to anyone at all. Not even you.