What OS are you on? GC should get triggered before you run out but some OSes 
have really poor behavior in this regard.

> On Mar 10, 2014, at 3:15 PM, Daniel H <danielc...@gmail.com> wrote:
> 
> Hi all,
> 
> I find that Julia's GC doesn't collect garbage regularly, so the computer 
> might run out of memory and starts swapping.
> 
> Here's what I did
> A = <a big matrix. After A is defined, there would be 1.1 GB free memory left>
> 
> 
> B = <a random matrix of 500 MB>
> 
> 
> C = <a random matrix of 500 MB>
> # so now there's only 100 MB free on the memory
> 
> 
> C = 0
> # still 100MB free.... Julia not cleaning up Memory. MATLAB would free the 
> memory at this point
> 
> 
> B = <a random matrix of 500 MB>
> # run out of RAM, now stuff get written to disk
> 
> I wonder if there's any setting that make Julia do GC whenever possible?
> For example, in this case, GC would do something when I set C = 0.
> 

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