Re: [CZT-Devel] memory optimisation - comments please...

[Tim M. <tm...@un...>]

Hi Leo,

Thanks for looking into all of this. It is some useful analysis.

I have tried to use the getAnns() method without creating new references 
to it. I violate this only to improve readability. I don't think it is 
causing to many problems though because the annotation lists persist in 
memory as long as the AST exists, so references to these lists elsewhere 
won't have much of an effect.

One possibility to help with reducing the annotation list memory 
consumption is to modify the gnast code such that the annotation list 
for each term is initialised to null, and then only created the first 
time the getAnns() method is called. I'd wager that for a lot of terms, 
it is never called.

And regarding your previous email, I definitely think a 2-3% increase in 
CPU use is a good trade off for halving memory usage. In the parser and 
typechecker, we can always wait a bit longer for the result, but once 
we're out of memory, there's nowhere to go!

Cheers,
Tim

On 25/01/12 17:47, Leo Freitas wrote:
> Hi guys,
>
> I think I found another source of some of the retained instances that seem to have weird behaviour.
>
> Term has a List<Object>  getAnns() method, which exposes information like LocAnn and TypeAnn and others.
> It's called in 1112 places across 17 CZT sub-projects: that exposes the ArrayList / Object[] for retention from those
> that use the result or keep it in maps or the like.
>
> Having said that, I couldn't find a place of misuse in the scattered references that I searched for (e.g., this might
> be just another red herring or a key point for modification/memory-performance-improvement).....
>
> thoughts / comments / suggestions ?
>
> Leo
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