Hi,
There seems to be a printing problem in that error message (-0.0MB
should say 2.5GB), but other than that I can't think of much else to add
that isn't in the error message already. The error message tells us you
are using a 32bit computer. Are you Windows or Linux? 2.5GB is over
2^31 bits, so at the limit of addressability for 32bit. The file
doesn't need to fit in RAM, but it does need to be addressable. For
example if you had 1GB of RAM, you should be able to read a 1.5GB file
ok. It's not the amount of RAM you have per se, but whether you are
32bit or 64bit.
Matthew
On 02.04.2013 05:06, vishal wrote:
I am trying to read 2.5GB pipe delimited text file in R using fread
but I am
getting below error.
" Opened file ok, obtained its size on disk (-0.0MB), but couldn't
memory
map it. This is a 32bit machine. You don't need more RAM per se but
this
fread function is tuned for 64bit addressability, at the expense of
large
file support on 32bit machines. You probably need more RAM to store
the
resulting data.table, anyway. And most speed benefits of data.table
are on
64bit with large RAM, too. Please either upgrade to 64bit (e.g. a
64bit
netbook with 4GB RAM can cost just £300), or make a case for 32bit
large
file support to datatable-help."
I have used following syntax.
setwd("E:/Projects/Alo")
library(data.table)
f <- fread("6.txt",header="auto")
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