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Re: memory release problem in mathematica6.0

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  • Subject: [mg83236] Re: memory release problem in mathematica6.0
  • From: jack <giabernar at>
  • Date: Fri, 16 Nov 2007 05:17:09 -0500 (EST)
  • References: <fhegac$m08$> <fhh71o$8h2$>

What i was pointing out ( there is a typo error in my post ) is that
the MemoryInUse[] command of mathematica gives the correct result in
the sense that memory is released but the physical memory not yet. I
understand that memory management of mathematica is different from
that of the Operating System for speed reasons, but i think that
something goes wrong because, as is confirmed by Yaroslav Bulatov in a
successive post, when i clear a symbol ( of many elements, ~300MB )
and a reallocate it three or four times physical memory runs out and
the memory system swaps all the time  ( i' ve 756MB of RAM ) until i
shutdown the kernel.
I' d like to know if there is an explicit way to synchronize the
memory management of mathematica with that of the OS, because i think
that the behavior that i' ve just described must be avoided.

Thanks for your contribute.

Jens-Peer Kuska wrote:
> Hi,
> you think that Mathematica call the memory management functions
> of the operating system every time it aqquire or release memory ?
> This would probably incredible slow .. it will request memory from the
> operating system and integrate it inti its own memory management
> And the operating system show it't own memory management but not that
> of Mathematica ..
> Regards
>    Jens
> jack wrote:
> > Hi all,
> > When i define large data structures, for example an array  "A" of
> > million  of elements that occupy some  hundreds of MB of physical
> > memory,when i clear it, with Clear[A] memory isn' t released by
> > operating system. I' ve tried both on windows and linux.
> > The result of MemoryInUse[] command of mathematica but the physical
> > memory reported by the system monitor isn't released.
> > I' ve tried also ClearSystemCache[] but with no result.
> > Am i missing something?
> >
> > Thanks!
> >
> >

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