Hello,
I take this back, wrong implementation of the experiment.
Sorry for the noise.
Regards
Saptarshi
On Sun, Aug 15, 2010 at 12:22 PM, Saptarshi Guha
<saptarshi.g...@gmail.com> wrote:
> Hello,
> I have question about the overhead in lapply.
> x is a list of 3000 lists. Each of the i (1<=i<=3000) list elements is
> pair of two elements: a string vector and a data frame
>
> x is roughly 235MB.
>
>> gc()
> ##
>
>> z <- system.time(y <- lapply(x,function(r){
> system.time(serialize(r,NULL))['elapsed']
> }))
>> sum(unlist(y))
> 18.812
>> z
> user system elapsed
> 494.144 0.041 494.247
>
> So, the entire lapply takes ~26 times longer than the sum of the
> individual operations.
>
> Have i missed something?
>
> Regards
> Saptarshi
>
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