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>> 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 ;-)
Thanks,
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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