Re: out of memory

["Thatcher Ulrich" <tu@...>]

On Oct 06, 2002 at 12:22 +0200, Enrico Colombini wrote:
> >I'll run some tests with QBasic or VBD and see what comes out.
> 
> Here are the results. I had to use a 16-bit DOS Basic (Microsoft's VBD) as
> I don't have a 32-bit Basic installed, so the results are probably skewed
> (I don't know in what direction, but 16-bit computations are *probably*
> faster - I don't know modern CPUs well enough to tell; on the other hand,
> the Basic program ran in a limited memory space).
> I was also forced to limit the string size to about 30 kB (could somebody
> re-run the test using VB?).
> 
> Lua program:
> 
>  s = ""
>  for i = 1,30000 do
>    s = s .. "x"
>  end
> 
> Basic program:
> 
>  s$ = ""
>  FOR i = 1 TO 30000
>    s$ = s$ + "x"
>  NEXT
> 
> 
> Running times on my Pentium II/350, in seconds:
> 
>  Lua (standalone interpreter): 7.75
>  VBD (interpreted):            4.94
>  VBD (compiled):               0.17
> 
> The first two results are more or less equivalent (it could boil
> down to the 32-bit vs. 16-bit difference), but the third one sounds
> interesting.  Maybe there could be space for string concatenation
> optimization, after all.

If you have an app that really benefits from mutable strings, you
could look at making a userdata type.  It shouldn't take much code.

-- 
Thatcher Ulrich
http://tulrich.com