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MathGroup Archive 2003

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Re: Odd memory behavior, and uncontrollable memory growth

  • To: mathgroup at
  • Subject: [mg40069] Re: Odd memory behavior, and uncontrollable memory growth
  • From: Jens-Peer Kuska <kuska at>
  • Date: Tue, 18 Mar 2003 05:49:58 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <b4ub7d$qka$>
  • Reply-to: kuska at
  • Sender: owner-wri-mathgroup at


set the $HistoryLength=0;
may help you.


nafod40 wrote:
> Hola,
> We are writing code where semi-complicated functions get run thousands
> of times in packages. when we do this, we are getting memory use growth
> that eventually drives the system to virtual memory, and severe speed
> penalties.
> I have been trying to gain an understanding of this process, and came up
> with the following odd example that makes no sense to me. Can someone
> explain?
> a=MemoryInUse[];
> (q=tempFunk[10000];1);
> d=MemoryInUse[];
> d-a
> The memory bumps up by 1080 bytes per iteration. It  climbs, but slowly.
> I figure that is justified by the In[] and Out[] storage. Now one small
> change...
> a=MemoryInUse[];
> (q=tempFunk[10000];);
> d=MemoryInUse[];
> d-a
> Now the memory jumps by 80,000 bytes per iteration! All I did was remove
> the "1" from within the parentheses. What's up with that? I tried this...
> a=MemoryInUse[];
> (q=tempFunk[10000];);
> q=1;
> d=MemoryInUse[];
> d-a
> To force the clearing of 'q', still it jumps by leaps and bounds. Any
> ideas why?

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