[chuck-users] OSX updates =< real-time audio?

[mike clemow]

Apple dropped the ball on this one.

So, I performed the (totally unsafe) procedure described in the second
of Brad's links:

http://discussions.apple.com/thread.jspa?threadID=1463824&tstart=0

And it solved the problem.  It's a roll-back to the previous version
of the Airport Extreme update by extracting the contents of the .pkg
and manually replacing the newer version with the old.  A friend of
mine likened it to "doing open-heart surgery with a knife you found on
the floor of Denny's."

I don't like it, but it worked.

-Mike



On Tue, Apr 15, 2008 at 3:55 AM, Ge Wang <ge at ccrma.stanford.edu> wrote:
> Hi Brad and all!
>
>
>  > I had heard it was the latest Airport Extreme update (2008-001, I
>  > think).  You might try turning off your Airport to see if it helps.
>
>  Whoa, it appears to make a huge difference!  As far as I can tell, that's
>  the problem!  Thanks Brad!!!!
>
>
>  > I also heard that someone just re-installed the last Airport update:
>
>  Hmm, this appears to require first installing a third-party application.
>  Less than spectacular - way to go, Apple.
>
>  Going to figure out a workaround, while hoping for OS X to update the
>  update to unbreak things.
>
>  Thanks to all for all the suggestions!
>
>  Best,
>  Ge!
>
>
>
>  > On Apr 14, 2008, at 3:42 AM, Ge Wang wrote:
>  >
>  >> Greetings again!
>  >>
>  >> Following up... after additional testing on the inconsistent real-time
>  >> behavior, we have found:
>  >>
>  >> * buffer size has no apparent effect
>  >> * system scheduling priority (--level) has no apparent effect
>  >> * number of buffers has no apparent effect
>  >> * BLOCKING nearly fixes the problem, but this is undesirable
>  >> because it
>  >> is a bit more inefficient and also less amenable to really small
>  >> buffer
>  >> sizes, compared to CALLBACK.
>  >>
>  >> To help make sure I am not going insane (faster than expected), I also
>  >> tried running PD (both 40-2 and 41-4).  In both cases, similar audio
>  >> hickups were occurring even when playing a single sine wave on my
>  >> newly
>  >> upgraded system.  At least on my setup, something is fairly wrong.
>  >> Not
>  >> sure if it's the new software/firmware updates, or me doing something
>  >> ill-advised (fairly standard M.O.), or something else altogether.
>  >>
>  >> Any thoughts would be greatly appreciated!
>  >>
>  >> Best,
>  >> Ge!
>  >>
>  >> On Sun, 13 Apr 2008, Ge Wang wrote:
>  >>
>  >>> Greetings,
>  >>>
>  >>> We are experiencing some rather unfriendly real-time behavior on
>  >>> OS X, seemingly after doing the latest apple upgrades... here are
>  >>> some details, at least on my machine:
>  >>>
>  >>> * system: Macbook Pro / OS X (10.4.11)
>  >>> * updates: Quicktime 7.4.5 + MPB EFI Firmware Update 1.5
>  >>> * symptoms: real-time audio "goes to poop", even under moderate
>  >>>   loads.
>  >>> * workaround: running command line chuck in BLOCKING mode (via
>  >>> --blocking) seems to work, however the default CALLBACK mode seems
>  >>> completely hosed, even with bigger buffer sizes.  This is especially
>  >>> problematic for the miniAudicle, which doesn't have the option
>  >>> currently
>  >>> to choose between blocking vs. callback.
>  >>>
>  >>> Has anyone else noticed similar behavior, either on Tiger or Leopard?
>  >>> Or is this an isolated case for my system?  We'd appreciate any
>  >>> input!
>  >>>
>  >>> Thanks!!
>  >>>
>  >>> Best,
>  >>> Ge!
>  >>>
>  >>> _______________________________________________
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>  >>> chuck-users at lists.cs.princeton.edu
>  >>> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
>  >>>
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urls is coming...