R not using entire RAM Available -

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this question has answer here:

i have 16gb ram machine windows 64 bit.if run model in r uses 2gb , remaining memory free. have run same model in 4gb machine takes 4 hours give result,so upgraded 16gb ram ,but still r takes same 4 hours run same model in 16gb machine also.r not using more 2gb of ram.

any idea why r not using entire ram avaiable.

on 64-bit os, handling 16 gb of ram should no problem r. configuration-issue prevents r doing so.

you can check current memory-limit calling memory.limit() (see http://www.inside-r.org/r-doc/utils/memory.size). can use memory.limit(12000) set new limit.

but should check whether ram limiting factor. if doing number-crunching, increasing ram not speed calculation of result.


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