Reverbsc.

I had done comparative reverb tests some time ago, reporting them to this 
list.

IIRC, reverbsc operates only at a modest premium to the "ordinary" reverb. 
(Besides, this is the sound I prefer, especially for its sense of depth and 
space.)

Art Hunkins

----- Original Message ----- 
From: "Andres Cabrera" 
To: 
Sent: Tuesday, January 13, 2009 3:44 PM
Subject: [Csnd] Re: Re: Re: Re: Re: SR and CPU Usage on the OLPC?


Which reverb are you using? I would think the ordinary reverb opcode
is not so expensive.

Cheers,
Andrés

On Tue, Jan 13, 2009 at 3:02 PM, Art Hunkins  wrote:
> I have also now observed that adding a global reverb instrument (stereo
> reverbsc) to my test .csd (8 instruments) causes overall CPU usage to
> skyrocket from 5-6% to 80%. So, no optional reverb/depth for the OLPC.
>
> To summarize what I've found it necessary to do to port my .csd's to OLPC
> (i.e., keep to reasonable, glitch-free CPU usage):
>
> Reduce the 16 voices to 8
> Reduce the SR from 44100 to 36000
> Increase ksmps from 10 to 100
> Eliminate optional reverb/depth processing
>
> I can live with this, so far at least. (Sounds a bit like our current
> economic situation, doesn't it?)
>
> Art Hunkins
>
> ----- Original Message ----- From: "Victor Lazzarini"
> 
> To: 
> Sent: Tuesday, January 13, 2009 1:07 PM
> Subject: [Csnd] Re: Re: Re: SR and CPU Usage on the OLPC?
>
>
>> 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.
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>>>> "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
>>
>>
>> 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.
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> csound"
>



-- 


Andrés


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