Hello All,
this time i need a help for a csd i'm working on. These receive many OSC
messages by IanniX
(a graphic sequencer). I would need to record the audio file (using fout).
For some reason that i'm not able to understand (that is my fault), i cannot
have a good performance
(near the 3/4 time many glitches).
I have try many change to the csd but with no luck.
Maybe some of You can tell me what is wrong or if there are some bottleneck.
Apologies, the csd is long and i'm not so able.

thanks in advance for any help.
ciao,
francesco.

(Ubuntu 10.04, Csound 5.13 doubles)

http://csound.1045644.n5.nabble.com/file/n4797656/test.csd test.csd 



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dear Francesco,

Your csd is quite long and uses many opcodes that I'm not familiar with.

However, I have had a lot of experience with OSC. One important thing  
that I learned is that  OSC messages probably arrive faster than your  
csd can process them. Your k-rate is 441, which is what I also use for  
realtime performance.

Probably the OSC messages are arriving much faster than 441 messages  
per second.

I learned that these messages are put into an internal csound buffer  
as they arrive, and if your csd takes them out too slowly, the sounds  
will be very much delayed and strange things could happen when the  
buffer fills up.

To deal with this I wrote a UDO that I throws away all but the most  
recent OSC message, and then returns that message. In this way the  
buffer does not fill up, and the csd responds to the messages just  
about as fast as they arrive. Here is the UDO:

opcode	getosc, k,Sk	;reads OSC message, emptying input buffer
	Smsg,kvalue		xin
	kcount	=	0
	getmore:
		kk 		OSClisten giport, Smsg, "f",   kvalue
		if(kk>0)then
			kcount	=	kcount + 1
			kgoto getmore
		endif
	xout	kvalue
endop

Here is a typical call to the UDO:

gkpitchval		getosc	"/wii/1/accel/pry/0",	gkpitchval

I hope this is useful.

Lou Cohen


On Sep 13, 2011, at 4:47 AM, francesco wrote:

> Hello All,
> this time i need a help for a csd i'm working on. These receive many  
> OSC
> messages by IanniX
> (a graphic sequencer). I would need to record the audio file (using  
> fout).
> For some reason that i'm not able to understand (that is my fault),  
> i cannot
> have a good performance
> (near the 3/4 time many glitches).
> I have try many change to the csd but with no luck.
> Maybe some of You can tell me what is wrong or if there are some  
> bottleneck.
> Apologies, the csd is long and i'm not so able.
>
> thanks in advance for any help.
> ciao,
> francesco.
>
> (Ubuntu 10.04, Csound 5.13 doubles)
>
> http://csound.1045644.n5.nabble.com/file/n4797656/test.csd test.csd
>
>
>
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Some-help-about-a-csd-performance-tp4797656p4797656.html
> Sent from the Csound - General mailing list archive at Nabble.com.
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body  
> "unsubscribe csound"
>



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hello,

from the csd I saw that you are using portaudio as audio driver. It may but also may not work better with jack. 

About jack I found once and article that it is normally run with too low priority (especially if you are using realtime kernel). If
you run it from command line add flag -P 80 (the default priority is
10 ... ) or -P 70 - or you can experiment what works - it may improve the performace conciderably.

If you use qjackctl for starting jack, ther is no option where to set the priority, just write
jackd -P 70
to "Server Path" in settings.

Without fout, does it run OK? No xruns?

I have had similar problems with fout with 4 channels of audio, but in the end it
worked OK. ( +  don't worry, the glitches will not go to your recording!)

Or use another application for recording.

I saw that your buffers (-b and -B ) were actually already very big. I have never understood the buffer logic thouroughly but I remember a phrase from somewhere that sometimes too large buffer is not good either. Does it make any difference if you bring it down to for example to -b 1024 -B 4096 (that is huge buffer also anyway)?

tarmo



With 
On Tuesday 13 September 2011 11:47:10 francesco wrote:
> Hello All,
> this time i need a help for a csd i'm working on. These receive many OSC
> messages by IanniX
> (a graphic sequencer). I would need to record the audio file (using fout).
> For some reason that i'm not able to understand (that is my fault), i cannot
> have a good performance
> (near the 3/4 time many glitches).
> I have try many change to the csd but with no luck.
> Maybe some of You can tell me what is wrong or if there are some bottleneck.
> Apologies, the csd is long and i'm not so able.
> 
> thanks in advance for any help.
> ciao,
> francesco.
> 
> (Ubuntu 10.04, Csound 5.13 doubles)
> 
> http://csound.1045644.n5.nabble.com/file/n4797656/test.csd test.csd 
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Some-help-about-a-csd-performance-tp4797656p4797656.html
> Sent from the Csound - General mailing list archive at Nabble.com.
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 
> 


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Hello All and thanks to All of You,
Your words are always helpful for a lover (of music and Csound) not expert
like me.

To Mr. Louis:
Thank You, i did not think at the OSC rate and buffer ... And i will try
Your UDO that seem 
to be really helpful.

To Mr. Peiman:
Thank You. The strange thing (maybe not so strange) is that fout output file
seems ok, but realtime out is not, and i guess that fout either is
responsible of that. This could be secondary for my case (i could not have
realtime output), but the csd is sending OSC messages also, and the
sequencer is receiving that messages following realtime execution
(obviously). So i have a audio file probably correct, and a video of
sequencer not in sincro with recorded audio.
Like You said i will try to use Ardour to record Csound output.

To Mr. Tarmo:
(Sorry, i read only now Your yesterday message!).
i have try almost all drivers i know (portaudio, alsa, and jack, with
internal or external card), with many 
differents b and B buffer size, and many different krate (from sr to 10 !!).
Also a realtime kernel.
And You were right, i did not think about this, using alsa i can use more
great buffers (and more latency, that it's not my priority). About jack
priority seems that i can set that in qjackctl (or am i wrong?). Anyway
i'm using kxstudio on ubuntu (thanks to Mr. Menno) that have a more easy way
of setting jack (via Cadence), but i will try also to use -P 90 in server
path, like You said.
And finally, also without fout i have glitches. This is why i think there is
something wrong (a bottleneck) in my csd. An example:
this

loop:
    timout    0, 4, go
    reinit      loop
go:
    event_i		"i", 50, 0, 2, 7.00
    event_i		"i", 50, 1, 2, 7.07
    event_i		"i", 50, 2, 2, 8.00

changed to

ktrig    metro    0.25
scoreline    {{
    i 50 0 2 7.00
    i 50 1 2 7.07
    i 50 2 2 8.00
    }}, ktrig

seems to be more efficient, but i don't know why.

I will go on to explore ...

(Apologies for my too much apologies and thanks, but i'm really this, and no
way to change me anymore)

Ciao,
francesco.



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Tarmo Johannes wrote:
> ...
>
> If you use qjackctl for starting jack, ther is no option where to set the priority...

That will be news to its developer. :)

In the Setup dialog you'll see a scroll-box named Priority in the 
Parameters section. Set it as needed.

Best,

dp



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> In the Setup dialog you'll see a scroll-box named Priority in the 
> Parameters section. Set it as needed.

Oh, I was blind!

so shamed, I am sorry...

I was working around an open path.

thanks!
tarmo

On Wednesday 14 September 2011 14:06:09 Dave Phillips wrote:
> Tarmo Johannes wrote:
> > ...
> >
> > If you use qjackctl for starting jack, ther is no option where to set the priority...
> 
> That will be news to its developer. :)
> 
> In the Setup dialog you'll see a scroll-box named Priority in the 
> Parameters section. Set it as needed.
> 
> Best,
> 
> dp
> 
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 
> 


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