Re: phantom MultibandCompressor
Re: phantom MultibandCompressor
- Subject: Re: phantom MultibandCompressor
- From: Robert Grant <email@hidden>
- Date: Wed, 5 May 2004 09:17:42 -0400
Well Rax when it's idling is taking ~ 6% of my CPU and that's with no
UI update timer active, no MIDI input and no AUs in the graph other
than Apple Mixers and Output units.
The Render thread is taking 5.1 % of the total CPU time and
AUMultibandCompressorEntry (or whatever it is) is taking 70.4% of that
5.1 %.
Perhaps that's the expected amount of overhead? I'm really just wanting
a sanity check as I can't do much about the graph composition.
Thanks,
Robert.
On May 4, 2004, at 6:19 PM, Doug Wyatt wrote:
On May 4, 2004, at 15:02, Robert Grant wrote:
Ahh,
But it's a bit worrisome that Shark is telling me that 67% of my
audio render thread time is being spent in
AUMultibandCompressorEntry. Any suggestions as to what might be
happening? I thought the mixers were highly optimized. This is a
graph with only Apple AUs in it which are either OutputAUs or Mixers!
Robert.
On May 4, 2004, at 5:45 PM, Doug Wyatt wrote:
On May 4, 2004, at 14:27, Robert Grant wrote:
I'm getting an AUMultibandCompressorEntry showing up in my Shark
stack trace but I haven't added one to my AU graph. And actually
I'm getting a lot more SystemOutputAUEntry's than I have Output AUs
(HAL or Generic) in my graph.
Are there extra AUs being utilized under the covers by other AUs?
No. Shark only sees a small handful of symbols from
CoreAudio.component, which contains all the system AU's. There are
so few exported symbols that the one nearest to any given piece of
code is more likely to be misleading than informative.
Doug
OK, Shark's telling you that 67% of your render thread time being
spent somewhere in our components, and that they're doing roughly
twice as much work as your code. But how much work is that? How much
CPU is being consumed on the whole by the render thread? If it's
taking 1% of the CPU, there's no big deal. If the render thread is
consuming 80% of the CPU, *then* that 67% is worrisome.
--
Doug Wyatt
Core Audio, Apple
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