Article View: sci.fractals
Article #452Re: GIPPP#3 now completely subscribed
From: Jay R. Hill
Date: Fri, 14 May 1993 21:47
Date: Fri, 14 May 1993 21:47
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2853 bytes
In article <1993Apr30.204926.6970@ast.saic.com>,
hilljr@jupiter.saic.com (Jay R. Hill) writes:
|> In article <1993Apr27.184408.10491@ast.saic.com>,
hilljr@jupiter.saic.com (Jay R. Hill) writes:
|> |> Hello Netters,
|> |> We'd like to ask for your help (actually your CPU's help) in doing
|> |> a large scale parallel computation. This computation will give
|> |> upper and lower bounds on the area of the Mandelbrot set.
|> ...
|> Thank you for the overwhelming response. Many machines are expected
|> to be continuing the calculation for a week or two.
Make that yet another few weeks. Of the 119 cells originally sent out,
97 are returned completed. Thanks. Some folk are really struggling with
more difficult cells (taking up to 3 weeks on a 4MF SUN). There are
several 18MFlop and a few 50-70MFlop machines working hard on this. One
fellow offered a Cray, however we encourage 'nice' background running.
But at least 2 486/33 MSDOS machines got in a cell or two. One guy has
Spark10s which someone hits the red button on them every week or so :-(
Two have been killed by lightning. There was a posting on sci.fractals
about the 9 billion pixels of God. Hmmm. We could pass that any second
now! If we finish, it will be equivalent to 274877906944 pixels.
...
|> |> When the 'smoke clears' in a week or two or three, we'll have an
|> |> area estimate.
And that was posted before the lightning. ;-)
|> |> Your contributations will be logged and acknowledged.
|> |> Thanks, Jay Hill Yuval Fisher
Jay 'Not tonight honey, I have a bifurcating fractal' Hill
--
{ hilljr@jupiter.saic.com } begin writeln(3*ln(640320)/sqrt(163):17:15) end.
void main(){double sqrt(), y=1/sqrt(2.), a=.5, m=1,z; int n=0;
for(;m*=2,z=sqrt(1-y*y),y=(1-z)/(1+z),a=a*(1+y)*(1+y)-m*y,n<3;n++);
printf("%17.15lf\n",1/a);} /* 9 billion digits of pi, anyone? */
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<1993May14.214702.29442@ast.saic.com>Path:
arc1-ca.pugleaf.net!gmd.de!ira.uka.de!howland.reston.ans.net!usc!news.service.uci.edu!unogate!mvb.saic.com!ast.saic.com!jupiter!hilljrReferences:
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 107079,ed42220cea5a28bf X-Google-Attributes: gid107079,public X-Google-Thread: ff06e,ed42220cea5a28bf X-Google-Attributes: gidff06e,public X-Google-Thread: 10ed18,ed42220cea5a28bf X-Google-Attributes: gid10ed18,public X-Google-ArrivalTime: 1993-05-14 15:07:58 PST Newsgroups: sci.fractals,bit.listserv.frac-l,sci.math.num-analysis Path: arc1-ca.pugleaf.net!gmd.de!ira.uka.de!howland.reston.ans.net!usc!news.service.uci.edu!unogate!mvb.saic.com!ast.saic.com!jupiter!hilljr From: hilljr@jupiter.saic.com (Jay R. Hill) Subject: Re: GIPPP#3 now completely subscribed Message-ID: <1993May14.214702.29442@ast.saic.com> Followup-To: sci.fractals,bit.listserv.frac-l,sci.math.num-analysis Keywords: GIPPP, Mandelbrot set area Lines: 36 Sender: news@ast.saic.com Organization: SAIC References: <1993Apr27.184408.10491@ast.saic.com> <1993Apr30.204926.6970@ast.saic.com> Date: Fri, 14 May 1993 21:47:02 GMT