OpenEuphoria

Re: Dramatic slowdown -ping Rob

• Posted by CoJaBo <cojabo at suscom.net> Nov 13, 2004
• 501 views

These are my results on an Athlon 64 2.8Ghz with 2GB RAM:

Intepreter INNER time
exw 2.4    27    0.08
exw 2.4    28    0.08
ex 2.4     27    0.00
ex 2.4     28    9.30

Yeah... I'd call that dramatic...
(CRASH!!) I have to go now, one of the cats
knocked something over, and it sounded like
it broke...

Pete Lomax wrote:
> 
> I've narrowed down the unexpected performance hit I mentioned earlier
> today (Re: Contest Update (12-Nov-2004))
> 
> If INNER is 27, this completes in 0.27 seconds. If it is 28, it takes
> 3.19 seconds, over tenfold performance drop. Why?
> 
> Does anyone else get these results? You may need to massage the
> figures a little to account for memory/cpu differences.
> 
> Rob, if you manage to duplicate this performance hit on 2.4, do you
> get the same on 2.5?
> 
> }}}
<eucode>
> constant START = time()
> constant INNER=28
> sequence table
> 		table=repeat(repeat(0,INNER),1024)
> integer used
> 		used=1
> 
> for i=1 to 45000 do
> 	used+=1
> 	if used>length(table) then table&=repeat(repeat(0,INNER),1024) end
> if
> 	table[used][5]=used
> end for
> 
> printf(1, "Elapsed time: %f\n", time() - START)
> </eucode>
{{{

> 
> Regards,
> Pete
> PS the performance hit disappears if I initialise the table to 40,000
> entries
> 
>