[R] memory management

[Sam Steingold]

> * Florent D. <sybqry at tznvy.pbz> [2012-02-09 19:26:59 -0500]:
>
>> m0 <- memory.size()
>> Mb.size  <- function(x)print(object.size(x), units="Mb")

indeed, these are very useful, thanks.

ls reports these objects larger than 100k:

behavior : 390.1 Mb
mydf : 115.3 Mb
nb : 0.2 Mb
pl : 1.2 Mb

however, top reports that R uses 1.7Gb of RAM (RSS) - even after gc().
what part of R is using the 1GB of RAM?

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