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Re: vector of bin indices using histogram? [message #50744]

Thu, 19 October 2006 00:45

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

Jean H. wrote:
>> intel pentium 4 (idl 6.2):
>>
>> p=fltarr(5d7)
>> t=systime(1) & b=p*.5 &print,systime(1)-t
>> 0.33394289
>> t=systime(1) & b=p/2. &print,systime(1)-t
>> 0.82017112
>>
>> Ratio: 2.5
>
>
> IDL> p=fltarr(5d7)
> IDL> t=systime(1) & b=p*.5 &print,systime(1)-t
> 0.23399997
> IDL> t=systime(1) & b=p/2. &print,systime(1)-t
> 0.25000000
> .... ratio = 1.06 here... Pentium 4, windows XP pro, idl 6.3
> I guess the operating system has some influence too?!

Somehow it looks like that under windows the division
is optimized away, whereas under linux it is not...
I guess that this is one of the reasons why IDL is faster
under windows than linux.

Ciao,
Paolo

>
> Jean

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[Message index]

		Re: vector of bin indices using histogram? By: Paolo Grigis on Thu, 19 October 2006 00:45
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 14:42
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 14:07
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 11:12
		Re: vector of bin indices using histogram? By: C. E. Ordonez on Wed, 18 October 2006 10:57
		Re: vector of bin indices using histogram? By: Jean H. on Wed, 18 October 2006 10:09
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 09:56
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 09:27
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 09:25
		Re: vector of bin indices using histogram? By: David Fanning on Wed, 18 October 2006 09:06
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 08:53
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 08:38
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 08:33
		Re: vector of bin indices using histogram? By: David Fanning on Wed, 18 October 2006 08:08
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 07:47
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 07:00
		Re: vector of bin indices using histogram? By: btt on Wed, 18 October 2006 06:19

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