[ncl-talk] memory leak when using list variables

[Rick Brownrigg]

Hi Andy,

I would say that's not normal behavior. Thanks for the script that so
clearly demonstrates the behavior. I will file a bug report and let you
know the tracking number. It does seem related to specifying the slices
directly in the list creation; as a work-around, the following works OK:

   a = x(0,:)
   b = y(0,:)
   c = z(0,:)
   list1 = [/a,b,c/]
   ...
   delete(list1)

Hope the helps...and thanks for calling out the problem.
Rick


On Fri, Jun 30, 2017 at 8:16 AM, Andy Penny <andybpenny at gmail.com> wrote:

> Hi there,
>
> I encountered a memory leak when using list variables in NCL (v6.4 from
> ncl_ncarg-6.4.0-RHEL6.4_64bit_nodap_gnu447.tar.gz). If subsections of
> variables (e.g., var(0,:)) are included in the list instead of the entire
> variable, memory is not freed up when the list is later deleted. Below is a
> simple script that demonstrates the issue. Is this normal behavior?
>
> Thanks,
>
> Andy
> ---------------------------------------------
>
> x = new((/2,20000/),float)
> y = new((/2,20000/),float)
> z = new((/2,20000/),float)
>
> x(0,:) = fspan(0,20000,20000)
> y(0,:) = fspan(0,20000,20000)
> z(0,:) = fspan(0,20000,20000)
>
> x(1,:) = fspan(0,20000,20000)
> y(1,:) = fspan(0,20000,20000)
> z(1,:) = fspan(0,20000,20000)
>
> do i = 0, 100000
>   print("i= "+i)
>
> ;  list1 = [/x,y,z/]                ; works properly
>   list1 = [/x(0,:),y(0,:),z(0,:)/]  ; causes memory leak
>
>   delete(list1)
> end do
>
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