       Re: Big memory needed

• To: mathgroup at smc.vnet.net
• Subject: [mg110131] Re: Big memory needed
• From: Arturas Acus <Arturas.Acus at tfai.vu.lt>
• Date: Thu, 3 Jun 2010 05:39:31 -0400 (EDT)

```At the moment the task uses 28Gb of memory and runs on full speed.
If it will not finish, I will kill it tomorow with no further answer. We
have 128Gb of memory, but there are other tasks runnnig. Anyway this
means, that the rezult obtained will be useless.

On Wed, 2 Jun 2010, Scott Hemphill wrote:

> Artur <grafix at csl.pl> writes:
>
>> Dear Mathematica Gurus,
>> I would like to ask somebody with big memory in computer (more than 4
>> GB) to help me in solution following equation:
>> Solve[{1/(2 p) (-c p^2 + b p^3 - p^6 + 2 c q + 3 p^4 q - 3 p^2 q^2 + 2 q^3 +
>>        a^2 (-p^2 + q) - a (c - b p + 2 p^4 - 4 p^2 q + 3 q^2)) == d,
>>   1/(4 p^2) (-c^2 + b^2 p^2 + a^2 p^4 + 2 a p^6 + p^8 -
>>       2 b p^3 (a + p^2 - 2 q) - 4 a p^4 q - 4 p^6 q +
>>       2 c (a + p^2 - q) q - a^2 q^2 - 2 a p^2 q^2 + 3 p^4 q^2 +
>>       2 a q^3 + 2 p^2 q^3 - q^4) == e}, {p, q}]
>>
>>
>> I need any p-> solution which will be Sqrt from polynomial 10 degree
>> with coefficients  f(a,b,c,d,e)
>> Solution for g isn't important for me.
>>
>> CoefficientList from polynomial 10 degree is sufficient for me. I will
>> be very glad for any help!
>
> Do you have any idea how much memory and computer time is required?
>
> I finally gave up after 262 minutes of CPU time on an Intel Core 2 Quad
> processor running at 3.6GHz.  I have a lot of virtual memory I could
> throw at this problem, but only 8GB of RAM.  MathKernel had grown to
> 9889MB of virtual memory, but was only getting about 4% CPU usage
> because it was thrashing.
>
> Scott
> --
> Scott Hemphill	hemphill at alumni.caltech.edu
> "This isn't flying.  This is falling, with style."  -- Buzz Lightyear
>
>

```

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