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I am very new to machine learning (caret) and I am having trouble with RAM allocation in RStudio, but not R.
I am trying to run a Random forest model using cross validation. After preparing my train data.table (149717 obs with a size of 5392816 bytes) I get a error message:
Error: cannot allocate vector of size 1.1 Gb
Meaning that I don't have enough RAM to load the object. So I decreased my train data.table systematically and eventually, with only 5% of the original training data, the model works without producing this error.
However, this is not ideal, and i need to run my model on a larger sample than 5% of the original size. I decided to test this in R (not Rstudio) and my model works just fine with no memory issues using the full training data.table.
When looking at my task manager during R and Rstudio processing, it seems that R is way more efficient with memory usage than Rstudio (Rstudio used 100% of RAM while R used 65% while ruing the SAME test with the SAME data!).
When I use the memory.limit() function in Rstudio i get this output: 1.759219e+13 And then I run the same function in R I get this output: 16291
Laptop specs: 256 GIG SSD. 16 GIG RAM. Windows 10 Pro 64bit. I7 with 8 logical cores.
My question is: Why is my memory allocated so differently in R vs Rstudio? The memory limit for R is fine and uses all my RAM I have, but this is not the case with Rstudio.
Any ideas what can be causing this issue, or advise to resolve this RAM allocation issue?
kjtheron
Posted 2019-07-30T14:28:47.527
Reputation: 1