iTunes stuttering
iTunes stuttering
- Subject: iTunes stuttering
- From: Chris Luth <email@hidden>
- Date: Tue, 9 Aug 2005 15:16:06 -0800
I played around with HALLab (after building it) for a few minutes.
Pardon my CoreAudio ignorance, but I don't really understand the data
it's giving me or how to interpret it.
Just as Jeff suspected, here's one thing I noticed after playing
around a bit: I did a File>New>New Input Window, clicked on "Start
IO," and watched the Log to see what happened. When the audio
skipped, a corresponding log entry appeared, similar to the following:
449626.252741: overload
Again, no idea what this means, but it's a promising lead.
I'm not sure how to hook into a target app. File>New>New IO Cycle
Telemetry Window didn't give me much luck, either: I couldn't figure
out how to start the monitoring, and no data ever appeared in that
window.
To answer Alex's question: the one that's stuttering is the internal
drive on my 17" PB 1.67GHz with OS 10.4.2. The drive is 100GB, 5400
rpm, and connected via Ultra ATA/100.
Chris
On Aug 9, 2005, at 2:33 PM, email@hidden wrote:
Without going into the possible reasons for them (there are a myriad
of possibilities), glitches usually manifest themselves as an
overload or other anomaly in the HAL. The best tool to use to observe
the HAL is HALLab's IO cycle telemetry. The telemetry lets you hook
into a target app and snoop on what the HAL is up to. It also lets
you take latency traces based on telemetry events. Between the two
kinds of data you should be able to get a pretty darn good idea about
why something is glitching.
Plus, you end up with some solid data on which to base a bug report
when you file a bug about the problem.
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