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Out of Memory Bug; was Re: swap usage


  • To: mathgroup@smc.vnet.net
  • Subject: [mg12564] Out of Memory Bug; was Re: swap usage
  • From: jgraber@my-dejanews.com
  • Date: Sat, 23 May 1998 18:11:24 -0400
  • Organization: Deja News - The Leader in Internet Discussion
  • References: <6j3h1p$chf@smc.vnet.net> <6jevmj$3br@smc.vnet.net>

In article <6jevmj$3br@smc.vnet.net>,
  "P.J. Hinton" <paulh@wolfram.com> wrote:
>
> On 10 May 1998, Arturas Acus wrote:
>
> > Recently I have made some lenghty calculations  on Win95 (P166MHz) with
> > 32Mb RAM and 300Mb swap.
> >
> > Calculations sometimes used up to 240Mb. (when tested with
> > MaxMemoryUsed[]) Everything was fine with functions like ExpToTrig,
> > Expand, TrigToExp, Factor,  etc., but not with Simplify or
> > FullSimplify. It looks for me that this two functions can not use  swap
> > at all and exits with "Out of memory" message when all physical memory
> > (32Mb is loaded). If stated abov is true, then it would be interesting
> > to know all functions which can not use swap in order to save time.
>
> The spurious "Out of memory" messages that you see are not due to any
> inherent inability to use swap space.  It is more likely that they are
> due to a different problem altogether.  You may want to consult the
> Technical Support FAQ page at URL:
>
>   http://www.wolfram.com/support/Systems/Windows/OutOfMemory.html
>
> for a free, downloadable patch that may fix the problems you're
> encountering.
>
> --
> P.J. Hinton
> Mathematica Programming Group           paulh@wolfram.com Wolfram
> Research, Inc.                  http://www.wolfram.com/~paulh/
> Disclaimer: Opinions expressed herein are those of the author alone.
>
>
I have had similar problems ever since release 3 came out; this fix seems to
have solved them. Now I am curious: How long has this patch been available?  I
only found out about it yesterday.

I also want to say as strongly as possible that "Out of Memory. Exiting"
is not just a collosal bug, it is a major design flaw.  It should be
replaced with "Out of Memory. Aborting command being evaluated" as soon
as possible. Jim Graber

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