[squeak-dev] how/where is memory returned to the OS?
ma.chris.m at gmail.com
Fri Oct 19 18:31:35 UTC 2012
>> I have an image which needed to allocate 500MB of memory for a large
>> operation. Now that operation is done and all objects have been
>> reclaimed. According to VM I am now only using 200MB.
>> (Smalltalk vmParameterAt: 2) max: (Smalltalk vmParameter at: 1)
>> However, when I look at my VM process in "top" or the System Monitor,
>> it still says its >500MB.
>> How does this work?
> Depends on the platform. On Mac OS X memory is not returned. On Windows
> memory is allocated and freed via VirtualAlloc and VirtualFree. On Unix
> memory is allocated and returned via mmap and munmap by default. What OS
> are you on? Looks like the unix code could be ported to the Mac easily.
Linux chrisT520 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09
UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
So, after several hours top still shows >500MB. Will it ever go back
down to the level reported by vm-parameters [1,2 or 3]?
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