Re: [Rd] LazyData: no / yes

From: Christophe Genolini <cgenolin_at_u-paris10.fr>
Date: Tue, 06 Nov 2012 23:42:00 +0100

My real point was to explore the LazyData mechanism. So I try with LazyData: no and with LazyData: yes to see the difference, to see if I understand correctly the "WRE". The difference of the memory allocation pointed by the task manager alarm me, but you are right (I read the FAQ 7.42): my question has no real meaning.
Thanks for pointing me the 7.42.

Christophe
> On Nov 6, 2012, at 5:13 PM, Christophe Genolini wrote:
>
>> I get it from windows tack manager (under Window 7). I guess it is in K something.
>> My point was not about "how big is my dataset" (anyway, it is a fake dataset, so it can be as big as I want) but more about "where on hell are lost the 52 760 - 39 668 K ?"
>> :-)
> Ask your system ;) - you're comparing wrong things: a) you didn't run garbage collection so there will be temporary objects around and b) see FAQ 7.42 why what you're looking at has no real meaning.
>
> Cheers,
> Simon
>
>
>
>> Christophe
>>
>>> On Nov 6, 2012, at 1:03 PM, Christophe Genolini wrote:
>>>
>>>> Hi the list
>>>>
>>>> I have package foo0 with a big dataset 'myData'.
>>>> In DESCRIPTION, if I use 'LazyData: no', then I get:
>>>>
>>>> - when I open a R session : memory used=20 908
>>>> - when I attach 'library(foo0)' : memory used=24364
>>>> - then I load the set 'data(myData)' : memory used=39 668
>>>>
>>>> If I use LazyData: yes', then I get
>>>> - when I open a R session : memory used=20 908
>>>> - when I attach 'library(foo0)' : memory used=52 760.
>>>>
>>>> In this second example, after 'library(foo0)', I was expecting the memory to rize up to 39 668, not to 52 760... Where does the difference come from?
>>>>
>>> What do you mean by "memory used" - i.e. where do you get that from? After GC?
>>> This certainly doesn't look like a "big dataset" by the numbers - I would classify that as tiny :)
>>>
>>> Cheers,
>>> Simon
>>>
>>>
>>>> Thanks
>>>> Christophe
>>>>
>>>>
>>>> --
>>>> Christophe Genolini
>>>> Maître de conférences en bio-statistique
>>>> Vice président Communication interne et animation du campus
>>>> Université Paris Ouest Nanterre La Défense
>>>>
>>>> ______________________________________________
>>>> R-devel_at_r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>>
>>>>
>>
>> --
>> Christophe Genolini
>> Maître de conférences en bio-statistique
>> Vice président Communication interne et animation du campus
>> Université Paris Ouest Nanterre La Défense
>>
>>
>

-- 
Christophe Genolini
Maître de conférences en bio-statistique
Vice président Communication interne et animation du campus
Université Paris Ouest Nanterre La Défense

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Received on Tue 06 Nov 2012 - 22:47:17 GMT

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