Re: MatrixMixer CPU usage
Re: MatrixMixer CPU usage
- Subject: Re: MatrixMixer CPU usage
- From: Kevin Boyce <email@hidden>
- Date: Mon, 21 Feb 2011 17:08:28 -0500
On Feb 21, 2011, at 4:37 PM, Martin Hairer wrote:
It seems like MatrixMixer takes a huge amount of CPU, even just
sitting there.
Sounds like a lot. In Amadeus Pro, I use a MatrixMixer for playback,
even if
there's only one track present. On my MPB (2.53GHz Core Duo), playback
uses about 10% of (one) CPU, but this includes Apple's equalizing /
compressing
which, as tahome says, already makes up quite a bit of an
overhead... Maybe your
IO buffers are too small? Mine are currently set to 512 samples. If
I go down to
32 samples, my CPU usage for simple playback goes up to 30%, which
is closer
to what you see... Regards,
Hi Martin,
Thanks, I'll check that.
***time passes***
Okay, I checked and I'm using the default HAL Output Unit buffer size,
which reports as 512 samples.
I'm getting about 18-19% usage of one CPU on my white MB (2.1GHz Core
2 Duo), through the headphone jack. (Same using an iMic.) That's
fine performance, but I'm targeting the low end (schools, community
theatres, etc.), and many of them still have PPC machines. I don't
actually need the MatrixMixer yet, so I could ditch it, but it seems
like I must be coming at it all crabbed to be getting that much CPU
usage. And it's almost all overhead; it hardly changes when I'm
playing a mess of files through it.
Thanks!
-Kevin
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