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Re: memory release problem in mathematica6.0

  • To: mathgroup at
  • Subject: [mg83560] Re: memory release problem in mathematica6.0
  • From: Jens-Peer Kuska <kuska at>
  • Date: Thu, 22 Nov 2007 06:41:22 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <fhegac$m08$> <fhh71o$8h2$> <fhjqof$3ia$>
  • Reply-to: kuska at


this depend on your OS, on MS-Windows this works with out a
problem, but I have never seen it working on a Linux box ..
On MacOS X I should try it ..


jack wrote:
> 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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