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2009 Dec 14
1
as.data.frame requires a lot of memory (PR#14140)
...MP Tue Dec 1 19:26:23 UTC 2009 x86_64 GNU/Linux
Submission from: (NULL) (134.102.222.56)
The construction of a data frame in the way shown below requires
much more memory than expected. If we assume a cell value takes 8 bytes
the total amount of the data is 128mb. However the process takes about
920mb and not the expected 256mb (two times the data set).
With the real data sets (~35000 observations with ~33000 attributes) the
conversion to a data frame requires has to be killed at with 60gb of
memory usage while it should only require 17.6gb (2*8.8gb).
dfn <- rep(list(rep(0, 4096)), 4096...