I'm having some strange issues recording audio on dual-G5 machines
with > 2Gb of ram. When I record audio at any rate (44kHz is a good
example) using a CoreAudio either with my own programs or commercial
apps like Sound Studio 3, the recording stutters and drops out
frequently, leaving large gaps in my waveforms, and ruining my
recordings.
When I schedule my realtime audio thread, I register a callback with
audioDeviceAddPropertyListener(). Every time the drop outs occur,
using either my software or commercial packages, I receive a callback
notifying me that my thread couldn't run in the time allotted, which
is quite strange, since the cpu load *never* goes above 10%.
I have been able to duplicate this problem on several g5s of various
vintages, oses and configurations. When I remove enough ram to get
the machines below 2GB, the problem mysteriously disappears. The
problem is also strangely absent when I run the same programs on less
powerful machines (powerbooks, imacs, g4s, etc).
Is there a bug in core audio that only affects large memory, 64bit
machines?
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