So the recommendation for clearing memory is calling GC after some function
so that no references exist anymore?
Em quinta-feira, 7 de julho de 2016 17:17:03 UTC-3, Yichao Yu escreveu:
>
> On Thu, Jul 7, 2016 at 4:10 PM, Thuener Silva <thu...@gmail.com
> <javascript:>> wrote:
> > I have a code that uses a lot of memory and I'm trying to release some
> of it
> > but without success. I made up an examples to illustrate the problem:
> >
> > function memuse()
> > return string(round(Int,parse(Int,readall(`ps -p 29563 -o
> > rss=`))/1024),"M")
> > end
> >
> > function test()
> > for i = 1:2
> > println("\ni=$i")
> > a = rand(10000,10000)
> > println("Created a $(memuse())")
> > a = 0
> > gc()
> > println("Release a $(memuse())\n")
> >
> > b = rand(10000,10000)
> > println("Created b $(memuse())")
> > b = 0
> > gc()
> > println("Release b $(memuse())\n")
> >
> > c = rand(10000,10000)
> > println("Created c $(memuse())")
> > c =0
> > gc()
> > println("Release c $(memuse())\n")
> > end
> > end
> >
> > test()
> >
> >
> > Output:
> >
> > i=1
> > Created a 918M
> > Release a 918M
> >
> > Created b 1681M
> > Release b 1681M
> >
> > Created c 2444M
> > Release c 2444M
> >
> >
> > i=2
> > Created a 3207M
> > Release a 2444M
> >
> > Created b 3207M
> > Release b 2444M
> >
> > Created c 3207M
> > Release c 2444M
> >
> >
> >
> >
> > This code only needs 918M to run but uses 3207M.
> >
> > Questions:
> > Why gc() is not releasing unused memory?
> > There is some way to force garbage collector to release?
> > Why garbage collector releases some memory only on the second iteration?
>
> There's no guarantee that the a/b/c = 0 clears the reference.
>
> >
> >
> > Thanks,
> > Thuener
> >
>
