Victor,

Thanks for this very helpful observation. It led to the solution to my 
problem. It indeed turns out that the control rate is considerably more 
important than SR in regard to CPU usage.

Data:
SR=44100, ksmps=10: csound CPU usage=98, overall CPU usage=95
SR=36000, ksmps=10: csound CPU=61, overall CPU=71
SR=36000, ksmps=100: csound CPU=4, overall CPU=5

The latter is a *dramatic* difference - one I can live with. Finally, 
"sensekey tamed."

(Any explanations greatly appreciated.)

Thanks again, Victor.

Art Hunkins

----- Original Message ----- 
From: "victor" 
To: 
Sent: Tuesday, January 13, 2009 3:57 AM
Subject: [Csnd] Re: SR and CPU Usage on the OLPC?


>I also noticed that changing the control rate also makes
> a great deal of difference.
>
> Victor
> ----- Original Message ----- 
> From: "Art Hunkins" 
> To: 
> Sent: Tuesday, January 13, 2009 3:40 AM
> Subject: [Csnd] SR and CPU Usage on the OLPC?
>
>
>> Does anyone have an explanation for the following bizarre (but verified) 
>> data regarding SR's and CPU usage on the OLPC? My test .csd is with 
>> ksmps=10, realtime, with MIDI input.
>>
>> SR=44100: Csound CPU usage = 26%, total CPU usage = 54%
>> (SR=48000: 32% and 52%)
>> SR=36000: 4% and 6%
>> SR=32000: 3% and 5%
>> SR=22050: <3% and 4%
>>
>> All conditions, to my knowledge, except for SR, were identical.
>>
>> It makes no sense to me, but the difference is real. I'll be using 
>> SR=32000 or 36000 instead of 44100.
>>
>> Whatever the reason, I'll now be able to port *some* of what I'd hoped to 
>> the OLPC.
>>
>> Art Hunkins
>>
>>
>> Send bugs reports to this list.
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe 
>> csound"
>
>
>
> Send bugs reports to this list.
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe 
> csound" 

I suppose you are doing many more calculations at kr, so this
is what is making it heavy. ksmps=100 is I think very acceptable.

Regards

Victor
At 17:51 13/01/2009, you wrote:
>Victor,
>
>Thanks for this very helpful observation. It led to the solution to 
>my problem. It indeed turns out that the control rate is 
>considerably more important than SR in regard to CPU usage.
>
>Data:
>SR=44100, ksmps=10: csound CPU usage=98, overall CPU usage=95
>SR=36000, ksmps=10: csound CPU=61, overall CPU=71
>SR=36000, ksmps=100: csound CPU=4, overall CPU=5
>
>The latter is a *dramatic* difference - one I can live with. 
>Finally, "sensekey tamed."
>
>(Any explanations greatly appreciated.)
>
>Thanks again, Victor.
>
>Art Hunkins
>
>----- Original Message ----- From: "victor" 
>To: 
>Sent: Tuesday, January 13, 2009 3:57 AM
>Subject: [Csnd] Re: SR and CPU Usage on the OLPC?
>
>
>>I also noticed that changing the control rate also makes
>>a great deal of difference.
>>
>>Victor
>>----- Original Message ----- From: "Art Hunkins" 
>>To: 
>>Sent: Tuesday, January 13, 2009 3:40 AM
>>Subject: [Csnd] SR and CPU Usage on the OLPC?
>>
>>
>>>Does anyone have an explanation for the following bizarre (but 
>>>verified) data regarding SR's and CPU usage on the OLPC? My test 
>>>.csd is with ksmps=10, realtime, with MIDI input.
>>>
>>>SR=44100: Csound CPU usage = 26%, total CPU usage = 54%
>>>(SR=48000: 32% and 52%)
>>>SR=36000: 4% and 6%
>>>SR=32000: 3% and 5%
>>>SR=22050: <3% and 4%
>>>
>>>All conditions, to my knowledge, except for SR, were identical.
>>>
>>>It makes no sense to me, but the difference is real. I'll be using 
>>>SR=32000 or 36000 instead of 44100.
>>>
>>>Whatever the reason, I'll now be able to port *some* of what I'd 
>>>hoped to the OLPC.
>>>
>>>Art Hunkins
>>>
>>>
>>>Send bugs reports to this list.
>>>To unsubscribe, send email sympa@lists.bath.ac.uk with body 
>>>"unsubscribe csound"
>>
>>
>>
>>Send bugs reports to this list.
>>To unsubscribe, send email sympa@lists.bath.ac.uk with body 
>>"unsubscribe csound"
>
>
>
>Send bugs reports to this list.
>To unsubscribe, send email sympa@lists.bath.ac.uk with body 
>"unsubscribe csound"

Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth