Re: Jython memory inefficiency [Was: Re: [Gzz] 28th-29th (jvk)]

[Tuomas Lukka]

On Thu, Oct 31, 2002 at 12:42:56PM +0200, Janne Kujala wrote:
> On Wed, Oct 30, 2002 at 07:23:16PM +0200, Tuomas Lukka wrote:
> > > The code is executed 8 times for each of the key presses.
> > > 
> > > When the thrashing begins, java process memory size grows from
> > > about 180M to 930M. After that, I can press keys 6400 times
> > > while memory size grows to about 1050M. Then, I get
> > >   
> > >   Out of Memory
> > >   You might want to try the -mx flag to increase heap size
> > > 
> > > I'm using Sun's j2sdk1.4.1_01.
> > > 
> > > Any ideas?
> > 
> > Write that part of the code in Java? Jython isn't meant for that kind
> > of heavy number / string crunching. It's a glue language.
> 
> That does not explain java using 8 times the specified heap size
> (-Xmx128M) of memory. 
> 
> The problem disappears if I add the following piece of code:
> 
>     if 0:
>         texcoords += [ 1, 2, 3, 4 ]
>         texcoords += [ 1, 2, 3, 4 ]
>         texcoords += [ 1, 2, 3, 4 ]
>         texcoords += [ 1, 2, 3, 4 ]
>         texcoords += [ 1, 2, 3, 4 ]
>         texcoords += [ 1, 2, 3, 4 ]
>         ...
>         texcoords += [ 1, 2, 3, 4 ]
> 
> where the "texcoords" line is repeated 93 times.

?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!?!

Hmm, have you tried calling System.gc() explicitly?

        Tuomas