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MathGroup Archive 2005

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Re: Memory usage

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53647] Re: [mg53602] Memory usage
  • From: DrBob <drbob at bigfoot.com>
  • Date: Fri, 21 Jan 2005 06:36:16 -0500 (EST)
  • References: <200501200847.DAA04081@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

Show us the code you used to Split the array.

The result may not be packed, of course, and that could explain a lot of extra space.

Bobby

On Thu, 20 Jan 2005 03:47:42 -0500 (EST), Bruyndonckx P. <pbruynd at vub.ac.be> wrote:

> I am trying to use mathematica to analyse large data sets but I always run
> into memory problems
>
> I read a set of 16220656 Integer32 numbers from a file.  Mathematica
> stores these numbers efficiently in a packed array which consumes
> 16220656*4=64882680  bytes.  I want to divide the list whenever the number
> is 0 using the Split command. However, this process take 316 Mbyte of
> memory (difference between MemoryInUse before and after the Split
> command).
>
> Could somebody explain why Mathematica is using such a large amount of
> memory and how to avoid this ?  Is there a good reference on the topic of
> memory efficient programming in Mathematica ?
>
> Peter
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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