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- Subject: Re: out of memory
- From: "mnicolet" <mnicolet@...>
- Date: Tue, 8 Oct 2002 15:37:37 -0300
Just today I had time to read your message and test
myself the question.
I ran life.lua with lua 5 and the interpreter reached a
total data segment of 155 kb, until the script finished at
the 2000th generation ( as is stated in the loop ).
You don´t say over wich platform ( hw/OS ) your test
goes so bad. It´s a very interesting question.
My hardware is a PII 233 64Mb, running QNX 4.25.
If you don´t know, QNX does no ram/disk pagination.
----- Original Message -----
From: "Julien Cugniere" <firstname.lastname@example.org>
To: "Multiple recipients of list" <email@example.com>
Sent: Friday, October 04, 2002 7:09 PM
Subject: Re: out of memory
> Roberto Ierusalimschy wrote:
> >> s=""
> >> for i=1,100000 do
> >> s=s.."x"
> >> end
> > Are you sure this is from "life.lua"? I didn't find it there...
> The code I gave isn't; this is a simplification of life.lua's "draw"
> for y=1,self.h do
> for x=1,self.w do
> out=out..(((self[y][x]>0) and ALIVE) or DEAD)
> > Anyway, that code can really gives an "out of memory" error. This is not
> > a bug, but a limitation of the way Lua manipulates strings. (Java has
> > similar problems.)
> I knew of this limitation (thanks to the wiki actually).
> What makes me believe this is a bug is that with lua 5, life.lua dies
> about 120 iterations, while it runs fine with lua 4. Similarly, the bit of
> I gave runs fine (even though it takes time) with lua 4, but dies quickly
> lua 5. Moreover, I can understand that concatenating strings this way is
> but the corbage collector should reclaim unused memory... instead of that,
> memory usage grows, and once my 256 Mo of RAM are used the hard drive
> trash and then the program dies...
> Anyway, thanks for the reply and the info you gave.
> Julien Cugniere