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Re: memory release problem in mathematica6.0

• To: mathgroup at smc.vnet.net
• Subject: [mg83317] Re: memory release problem in mathematica6.0
• From: Nacho <ncc1701zzz at gmail.com>
• Date: Sat, 17 Nov 2007 05:26:11 -0500 (EST)
• References: <fhegac$m08$1@smc.vnet.net>

Hello.

I think that your confusion is because Mathematica also saves a copy
of the results in the Out[] array. Every operation is saved, so you
can recall any previous output (and input). It is saved even if you
use ; to discard the output.

I have found that when working with bif data sets or a lot of time,
the memory consumption is bigger and bigger.

You can limit the amount of history length with the variable
$HistoryLength

For example, if the first execution you do in Mathematica is

$HistoryLength=2;

only the 2 last results will be saved.

You can disable all the output history with $HistoryLength=0 but then
you cannot use % to call the previous result.

with $HistoryLength=0 you can run a = RandomInteger[10, 10000000];
Clear[a] as much as you want, but the memory is increased just the
first time,

Hope this help.

Regards.


On Nov 14, 10:49 am, jack <giaber... at gmail.com> 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!