[chuck-users] SndBuf causes hickup

Ge Wang gewang at CS.Princeton.EDU
Sat Jun 23 07:33:43 EDT 2007

Hi Atte and all!

It's about time SndBuf gets another look - we are definitely aware of  
the performance limitations of SndBuf - the current workaround (if  
it's fits your needs) is to read in most of the SndBuf at startup,  
and then, as Dan suggested, connect/disconnect the necessary SndBuf  
when needed.  Optimizing SndBuf performance is on the high priority  
list.  We hope to have a better answer for ya soon.


On Jun 15, 2007, at 1:36 AM, Atte André Jensen wrote:

> Scott Wheeler wrote:
>> Just another friendly, geeeky, explanation of what you're seeing  
>> -- when
>> you cat everything to /dev/null, that effectively puts all of those
>> samples into memory.
> Yes, I'm aware of that :-)
>> However, that's not connected to CPU performance; it's much more
>> connected to hard drive speed and more specifically how the OS
>> prioritizes different operations and how much of the file system
>> information it keeps in memory.
> I know that, too. My point is just my system seems fast enought, I can
> do 20+ tracks in ardour (which admittedly knows which samples  
> should be
> played in advance). And my HD is performing ok:
> ajstrup:~# hdparm -t /dev/hda4
> /dev/hda4:
>   Timing buffered disk reads:  122 MB in  3.01 seconds =  40.47 MB/sec
> It would be nice if chuck had a way of filling a SndBuf in the
> background, it should be finished when it's ready but should cause no
> hickups, and an a possibly with an ability to check at any given  
> time if
> the reading has been completed.
> -- 
> peace, love & harmony
> Atte
> http://atte.dk       | http://myspace.com/attejensen
> http://anagrammer.dk | http://atte.dk/compositions
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