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Article #452

Re: GIPPP#3 now completely subscribed

#452
From: Jay R. Hill
Date: Fri, 14 May 1993 21:47
36 lines
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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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From: hilljr@jupiter.saic.com (Jay R. Hill)
Subject: Re: GIPPP#3 now completely subscribed
Message-ID: <1993May14.214702.29442@ast.saic.com>
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Keywords: GIPPP, Mandelbrot set area
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References:  <1993Apr27.184408.10491@ast.saic.com> <1993Apr30.204926.6970@ast.saic.com>
Date: Fri, 14 May 1993 21:47:02 GMT