[R] how to free memory? (gc() doesn't work for me)

[jim holtman]

Depending on your operating system, the freed up memory might not be
returned to the operating system, but kept in the process space.

On Sat, Sep 4, 2010 at 10:17 PM, Hyunchul Kim <sundol at sfc.keio.ac.jp> wrote:
> Hi, all
>
> Thank you for your comments.
> I think that I misunderstood what gc() does because gc() is working as you
> posted.
>
> I posted my question because gc() doesn't reduce memory in use in a few
> system memory monitoring tools that I tested.
>
> Regards,
>
> Hyunchul
>
> On Sat, Sep 4, 2010 at 8:50 PM, jim holtman <jholtman at gmail.com> wrote:
>>
>> Seems to work for me:
>>
>> > x <- matrix(0,10000,10000)
>> > object.size(x)
>> 800000112 bytes
>> > gc()
>>            used  (Mb) gc trigger  (Mb)  max used  (Mb)
>> Ncells    174104   4.7     741108  19.8    741108  19.8
>> Vcells 101761938 776.4  113632405 867.0 102762450 784.1
>> > rm(x)
>> > gc()
>>          used (Mb) gc trigger  (Mb)  max used  (Mb)
>> Ncells  174202  4.7     741108  19.8    741108  19.8
>> Vcells 1761954 13.5   90905923 693.6 102762450 784.1
>>
>>
>> On Sat, Sep 4, 2010 at 12:46 AM, Hyunchul Kim
>> <hyunchul.kim.sfc at gmail.com> wrote:
>> > Hi, all
>> >
>> > I have a huge object that use almost all of available memory.
>> >
>> > R> rm(a_huge_object)
>> > R> gc()
>> >
>> > doesn't free memory and ?gc doesn't show anything.
>> >
>> > Are there any suggestion?
>> >
>> > Thanks in advance,
>> >
>> > Regards,
>> >
>> > Hyunchul
>> >
>> >        [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
>> > R-help at r-project.org mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> > http://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>> >
>>
>>
>>
>> --
>> Jim Holtman
>> Cincinnati, OH
>> +1 513 646 9390
>>
>> What is the problem that you are trying to solve?
>
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?