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  #1  
Old 10-14-2010, 11:12 AM
rusuden rusuden is offline
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Question CPU spikes in Ableton when Rewired with Num

Hey guys,

I did a bit of researching last weekend, here on the forum, and didn't really find anything that could help me out.
So, sorry if this has been discussed...

But I'm using Numerology 2.3 rewired to Ableton 8.x (not sure which version at this time - I'm at work) - and I get CPU spikes in Ableton Live.
I can see & hear these spikes. The CPU meter in Live jumps all the way to 100%.. and both Live & Numerology stutter/pause for a second.

I was using a very simple Stack: 2 IntervalSeq fed into 1 GateSeq which fed into a NoteGen. This MIDI output was rewired to an Ableton Live Midi channel, which controlled a hardware synth.
The sequence would run fine... but every minute or two... it would spike the CPU.

Not sure what's going on.... I'd like to upgrade to Numerology 3, but I wonder if I'll have the same problems.

Has anyone else had a similar issue??

My setup:

MacBook Pro (the newest one. Core i7... 4gb ram)
OSX Snow Leopard, latest
MOTU Ultralite mkIII
Numerology 2.3
Ableton Live 8
Launchpad connected using Ableton's default template

Any info, suggestions, help would be great! Thanks....

Last edited by rusuden; 10-14-2010 at 11:46 AM.
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  #2  
Old 10-14-2010, 12:58 PM
baltimoroder baltimoroder is offline
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Does it only happen when Num is rewired/running?

Did you try updating OSX/Live/MOTU/Num3?

Also, go to Terminal, type 'top' and monitor what process is actually spiking the CPU. Might not be related to audio.

Addendum: I seem to remember the new i7's having temperature & threading issues related to speed-step & firewire interfaces. Try googling around.

http://www.gearslutz.com/board/music...deo-proof.html

FWIW: I'm on a very similar setup (1st-gen Intel MacPro Desktop, OSX 10.6, MOTU 828mk2, Live 8, Num3 w/LP) and haven't seen what you described.
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  #3  
Old 10-14-2010, 01:55 PM
jim jim is offline
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Quote:
Originally Posted by baltimoroder View Post
Addendum: I seem to remember the new i7's having temperature & threading issues related to speed-step & firewire interfaces. Try googling around.

http://www.gearslutz.com/board/music...deo-proof.html
Interesting, thanks for the link....


@rusuden:

I haven't seen this issue. One thing to try is to use the same setup, but with the firewire interface unplugged, and run off the built-in audio instead. If you don't see spikes, it is definitely the interface.

A few other tips:
- Try a larger audio buffer, if you are using buffers smaller than 512 samples. Or try a lower sample rate if you're at 48Khz or higher.

- Turn logging off in Numerology.

- Try the same test w/ Numerology 3.

Cheers,
Jim
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  #4  
Old 10-14-2010, 02:15 PM
rusuden rusuden is offline
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Hey guys, thanks for the quick replies!!

Yes, it only happens when Live & Num 2.3 is rewired.
Live alone is ok.

I'll double check with the updates to OSX, MOTU & Live...
Even tho I'm always leary of updating Live in general.
I know I'm at least 2 updates behind.
I'll also get Num 3...

My MOTU is connected using USB2...
but I'll look into any discussion, as well.

Good tips on the Terminal, logging & just using the built-in audio...
I do believe my audio buffer is ok. But I'll check that again too.

Again, many thanks!
Will try to test before the weekend, and report back.
- justin
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  #5  
Old 10-15-2010, 10:24 AM
bphanks bphanks is offline
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This has been happening to me running Live, Num 2.3, on OSX 10.5.8, built-in soundcard. I figured it was just me but since it's not I'll pay a little closer attention and see if I can add anything meaningful to the thread.
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  #6  
Old 10-16-2010, 12:04 PM
rusuden rusuden is offline
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Hey guys...

So, I've been in updating/testing mode for a couple hours.
Good news & bad news.

1) Upgraded everything.
OSX - no change. up to date (10.6.4)
Ableton Live 8.2.1
Numerology 2.3.1b2
MOTU Firewire/USB2 drivers - latest one as of 10.16.2010

2) Disconnected Launchpad & my Evolution UC-16 midi controller ... Ran test with simple audio loop in Live ... and same Numerology stack mentioned previously... with MOTU as audio. Num Midi going to hardware synth
= still CPU spikes

3) Same test as #2, but with internal mac audio... & Num Midi going to VST synth
= still CPU spikes

4) Same test as #3, but with larger buffer (744 samples..)
= same CPU spikes

5) Same test as #4, but turned logging off in Num 2.3, restarted Num
= same CPU spikes

6) Downloaded Numerology 3 Pro build 12. Installed and used Num 3 with same stack file as before. Ran same test as #5 with Num 3 running.
= NO CPU spikes!!!

The same little test track has been running for about 10 minutes or so...
and still no problems. CPU meter just chilling at 6%... Perfect.

Well, I wish I had found a solution using 2.3, but I was planning on upgrading anyway... So Jim, I'll be doing that this weekend. Just gonna run demo mode for a bit longer. Thanks for a great new version!
... and thanks again everyone for debug suggestions.

Good luck, bphanks... Try out Num 3!

ok.. back to musics!

Last edited by rusuden; 10-16-2010 at 12:07 PM.
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  #7  
Old 10-17-2010, 04:06 PM
jim jim is offline
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Groovy, thanks for the detailed results! There are many updates to the ReWire driver happening as a result of code done for the AU version, so upgrading to 3 is really the way to go...

Cheers,
Jim
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