On 3/27/20 15:19, Hadley Wickham wrote:
On Fri, Mar 27, 2020 at 4:01 PM Hervé Pagès <hpa...@fredhutch.org
<mailto:hpa...@fredhutch.org>> wrote:
On 3/27/20 12:00, Hadley Wickham wrote:
>
>
> On Fri, Mar 27, 2020 at 10:39 AM Hervé Pagès
<hpa...@fredhutch.org <mailto:hpa...@fredhutch.org>
> <mailto:hpa...@fredhutch.org <mailto:hpa...@fredhutch.org>>> wrote:
>
> Hi Tomas,
>
> On 3/27/20 07:01, Tomas Kalibera wrote:
> > they provide an over-approximation
>
> They can also provide an "under-approximation" (to say the
least) e.g.
> on reference objects where the entire substance of the object is
> ignored
> which makes object.size() completely meaningless in that case:
>
> setRefClass("A", fields=c(stuff="ANY"))
> object.size(new("A", stuff=raw(0))) # 680 bytes
> object.size(new("A", stuff=runif(1e8))) # 680 bytes
>
> Why wouldn't object.size() look at the content of environments?
>
>
> As the author, I'm obviously biased, but I do like
lobstr::obj_sizes()
> which allows you to see the additional size occupied by one
object given
> any number of other objects. This is particularly important for
> reference classes since individual objects appear quite large:
>
> A <- setRefClass("A", fields=c(stuff="ANY"))
> lobstr::obj_size(new("A", stuff=raw(0)))
> #> 567,056 B
>
> But the vast majority is shared across all instances of that class:
>
> lobstr::obj_size(A)
> #> 719,232 B
> lobstr::obj_sizes(A, new("A", stuff=raw(0)))
> #> * 719,232 B
> #> * 720 B
> lobstr::obj_sizes(A, new("A", stuff=runif(1e8)))
> #> * 719,232 B
> #> * 800,000,720 B
Nice. Can you clarify the situation with lobstr::obj_size vs
pryr::object_size? I've heard of the latter before and use it sometimes
but never heard of the former before seeing Stefan's post. Then I
checked the authors of both and thought maybe they should talk to each
other ;-)
pryr is basically retired :) TBH I don't know why I gave up on it,
except lobstr is a cooler name 🤣 That's where all active development is
happening. (The underlying code is substantially similar although
lobstr includes bug fixes not present in pryr)
Good to know, thanks! Couldn't find any mention of pryr being abandoned
and superseded by lobster (which definitely sounds more yummy) in pryr's
README.md or DESCRIPTION file. Would be good to put this somewhere.
H.
Hadley
--
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--
Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N, M1-B514
P.O. Box 19024
Seattle, WA 98109-1024
E-mail: hpa...@fredhutch.org
Phone: (206) 667-5791
Fax: (206) 667-1319
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