One of my students made me aware of a funny latency issue.

If we use ftgentmp in an instrument, we get some latency, with an
increasing amount depending on the number of ftgentmp calls in the
instrument.
In itself, this might not be so strange, as ftgentmp must create the
tables every time the instrument is initialized.
The funny thing is that we get no such latency under windows, only under OSX.

Csd pasted below
(you may have to adjust buffers as the -b10 used is admittedly very
low, but works on OSX on our lab)

best
Oeyvind




-odac1 -M0 -b10 -B20 -m0



	sr	=	44100
	ksmps	=	10
	ksmps	=	100
	nchnls	=	2
	0dbfs	=	1

	giSine		ftgen	0, 0, 65537, 10, 1 	; sine wave

;********************************************
	instr 1

iTest1	ftgentmp 0, 0, 8, -2, 0
iTest2	ftgentmp 0, 0, 8, -2, 0
iTest3	ftgentmp 0, 0, 8, -2, 0
iTest4	ftgentmp 0, 0, 8, -2, 0
iTest5	ftgentmp 0, 0, 8, -2, 0
iTest6	ftgentmp 0, 0, 8, -2, 0
a1	oscili 1, 440, giSine
	outs	a1, a1

endin
;********************************************



f0 20
e



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I tried this and did not notice any change. Note that you have 2 ksmps  
assignments in your
orchestra. You might want to remove the second one.

On 25 Feb 2011, at 09:02, Oeyvind Brandtsegg wrote:

> One of my students made me aware of a funny latency issue.
>
> If we use ftgentmp in an instrument, we get some latency, with an
> increasing amount depending on the number of ftgentmp calls in the
> instrument.
> In itself, this might not be so strange, as ftgentmp must create the
> tables every time the instrument is initialized.
> The funny thing is that we get no such latency under windows, only  
> under OSX.
>
> Csd pasted below
> (you may have to adjust buffers as the -b10 used is admittedly very
> low, but works on OSX on our lab)
>
> best
> Oeyvind
>
>
> 
> 
> -odac1 -M0 -b10 -B20 -m0
> 
> 
>
> 	sr	=	44100
> 	ksmps	=	10
> 	ksmps	=	100
> 	nchnls	=	2
> 	0dbfs	=	1
>
> 	giSine		ftgen	0, 0, 65537, 10, 1 	; sine wave
>
> ;********************************************
> 	instr 1
>
> iTest1	ftgentmp 0, 0, 8, -2, 0
> iTest2	ftgentmp 0, 0, 8, -2, 0
> iTest3	ftgentmp 0, 0, 8, -2, 0
> iTest4	ftgentmp 0, 0, 8, -2, 0
> iTest5	ftgentmp 0, 0, 8, -2, 0
> iTest6	ftgentmp 0, 0, 8, -2, 0
> a1	oscili 1, 440, giSine
> 	outs	a1, a1
>
> endin
> ;********************************************
> 
>
> 
> f0 20
> e
> 
> 
>
> ------------------------------------------------------------------------------
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> data in
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> moving IT data
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> business
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> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel


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Strange,
I'll get someone to try it on another osx machine too.
Sorry about the double ksmps...

2011/2/25 Victor Lazzarini :
> I tried this and did not notice any change. Note that you have 2 ksmps
> assignments in your
> orchestra. You might want to remove the second one.
>
> On 25 Feb 2011, at 09:02, Oeyvind Brandtsegg wrote:
>
>> One of my students made me aware of a funny latency issue.
>>
>> If we use ftgentmp in an instrument, we get some latency, with an
>> increasing amount depending on the number of ftgentmp calls in the
>> instrument.
>> In itself, this might not be so strange, as ftgentmp must create the
>> tables every time the instrument is initialized.
>> The funny thing is that we get no such latency under windows, only
>> under OSX.
>>
>> Csd pasted below
>> (you may have to adjust buffers as the -b10 used is admittedly very
>> low, but works on OSX on our lab)
>>
>> best
>> Oeyvind
>>
>>
>> 
>> 
>> -odac1 -M0 -b10 -B20 -m0
>> 
>> 
>>
>>       sr      =       44100
>>       ksmps   =       10
>>       ksmps   =       100
>>       nchnls  =       2
>>       0dbfs   =       1
>>
>>       giSine          ftgen   0, 0, 65537, 10, 1      ; sine wave
>>
>> ;********************************************
>>       instr 1
>>
>> iTest1        ftgentmp 0, 0, 8, -2, 0
>> iTest2        ftgentmp 0, 0, 8, -2, 0
>> iTest3        ftgentmp 0, 0, 8, -2, 0
>> iTest4        ftgentmp 0, 0, 8, -2, 0
>> iTest5        ftgentmp 0, 0, 8, -2, 0
>> iTest6        ftgentmp 0, 0, 8, -2, 0
>> a1    oscili 1, 440, giSine
>>       outs    a1, a1
>>
>> endin
>> ;********************************************
>> 
>>
>> 
>> f0 20
>> e
>> 
>> 
>>
>> ------------------------------------------------------------------------------
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>> data in
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>> moving IT data
>> generated by your applications, servers and devices whether
>> physical, virtual
>> or in the cloud. Deliver compliance at lower cost and gain new
>> business
>> insights. http://p.sf.net/sfu/splunk-dev2dev
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>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
>
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I'm on 10.5; this might be the difference.
On 25 Feb 2011, at 10:19, Oeyvind Brandtsegg wrote:

> Strange,
> I'll get someone to try it on another osx machine too.
> Sorry about the double ksmps...
>
> 2011/2/25 Victor Lazzarini :
>> I tried this and did not notice any change. Note that you have 2  
>> ksmps
>> assignments in your
>> orchestra. You might want to remove the second one.
>>
>> On 25 Feb 2011, at 09:02, Oeyvind Brandtsegg wrote:
>>
>>> One of my students made me aware of a funny latency issue.
>>>
>>> If we use ftgentmp in an instrument, we get some latency, with an
>>> increasing amount depending on the number of ftgentmp calls in the
>>> instrument.
>>> In itself, this might not be so strange, as ftgentmp must create the
>>> tables every time the instrument is initialized.
>>> The funny thing is that we get no such latency under windows, only
>>> under OSX.
>>>
>>> Csd pasted below
>>> (you may have to adjust buffers as the -b10 used is admittedly very
>>> low, but works on OSX on our lab)
>>>
>>> best
>>> Oeyvind
>>>
>>>
>>> 
>>> 
>>> -odac1 -M0 -b10 -B20 -m0
>>> 
>>> 
>>>
>>>       sr      =       44100
>>>       ksmps   =       10
>>>       ksmps   =       100
>>>       nchnls  =       2
>>>       0dbfs   =       1
>>>
>>>       giSine          ftgen   0, 0, 65537, 10, 1      ; sine wave
>>>
>>> ;********************************************
>>>       instr 1
>>>
>>> iTest1        ftgentmp 0, 0, 8, -2, 0
>>> iTest2        ftgentmp 0, 0, 8, -2, 0
>>> iTest3        ftgentmp 0, 0, 8, -2, 0
>>> iTest4        ftgentmp 0, 0, 8, -2, 0
>>> iTest5        ftgentmp 0, 0, 8, -2, 0
>>> iTest6        ftgentmp 0, 0, 8, -2, 0
>>> a1    oscili 1, 440, giSine
>>>       outs    a1, a1
>>>
>>> endin
>>> ;********************************************
>>> 
>>>
>>> 
>>> f0 20
>>> e
>>> 
>>> 
>>>
>>> ------------------------------------------------------------------------------
>>> Free Software Download: Index, Search & Analyze Logs and other IT
>>> data in
>>> Real-Time with Splunk. Collect, index and harness all the fast
>>> moving IT data
>>> generated by your applications, servers and devices whether
>>> physical, virtual
>>> or in the cloud. Deliver compliance at lower cost and gain new
>>> business
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>>> Csound-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>>
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>>
>
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Use ftgenonce?

Well, yes I can work around it even by using global ftables.
I just thought it was strange that Csound behaved differently on the
two different platforms.
Oeyvind

2011/2/25 Michael Gogins :
> Use ftgenonce?
>
> On Feb 25, 2011 4:03 AM, "Oeyvind Brandtsegg" 
> wrote:
>> One of my students made me aware of a funny latency issue.
>>
>> If we use ftgentmp in an instrument, we get some latency, with an
>> increasing amount depending on the number of ftgentmp calls in the
>> instrument.
>> In itself, this might not be so strange, as ftgentmp must create the
>> tables every time the instrument is initialized.
>> The funny thing is that we get no such latency under windows, only under
>> OSX.
>>
>> Csd pasted below
>> (you may have to adjust buffers as the -b10 used is admittedly very
>> low, but works on OSX on our lab)
>>
>> best
>> Oeyvind
>>
>>
>> 
>> 
>> -odac1 -M0 -b10 -B20 -m0
>> 
>> 
>>
>> sr = 44100
>> ksmps = 10
>> ksmps = 100
>> nchnls = 2
>> 0dbfs = 1
>>
>> giSine ftgen 0, 0, 65537, 10, 1 ; sine wave
>>
>> ;********************************************
>> instr 1
>>
>> iTest1 ftgentmp 0, 0, 8, -2, 0
>> iTest2 ftgentmp 0, 0, 8, -2, 0
>> iTest3 ftgentmp 0, 0, 8, -2, 0
>> iTest4 ftgentmp 0, 0, 8, -2, 0
>> iTest5 ftgentmp 0, 0, 8, -2, 0
>> iTest6 ftgentmp 0, 0, 8, -2, 0
>> a1 oscili 1, 440, giSine
>> outs a1, a1
>>
>> endin
>> ;********************************************
>> 
>>
>> 
>> f0 20
>> e
>> 
>> 
>>
>>
>> ------------------------------------------------------------------------------
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>> Real-Time with Splunk. Collect, index and harness all the fast moving IT
>> data
>> generated by your applications, servers and devices whether physical,
>> virtual
>> or in the cloud. Deliver compliance at lower cost and gain new business
>> insights. http://p.sf.net/sfu/splunk-dev2dev
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>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
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Perhaps the heap acts differently.