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10.5: Monitor and disable CPU cores in 10.5 Other Hardware
If you would like to see how well your computer runs with only one CPU core, or possibly save power by turning one or more off when not in use, there is a wonderful utility named CPUPalette located in /Library » Application Support » HWPrefs

It will provide you with CPU usage information, as well as let you disable one or more cores.

Update: As noted in the comments, this app comes from the Developer Tools, which you'll find in the Optional Installs folder on the Leopard DVD. It does not exist, at least on my machine, in 10.4 (there's an app called CHUD that will do it, but this is different).

[robg adds: In playing with this little app, I discovered a semi-hidden settings mode: just click the oblong "options" widget in the top right of the menu bar, and a settings area will appear at the top of the window (click the image for the full-size version). You can control transparency, sample interval and history, switch from an area to a bar chart, and add a background grid. To quit the app (drag it to your dock, sidebar, or toolbar for fast future access), just click the red close button, as there aren't any menus in CPUPalette.]
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10.5: Monitor and disable CPU cores in 10.5 | 10 comments | Create New Account
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10.5: Monitor and disable CPU cores in 10.5
Authored by: ShadowBottle on Nov 06, '07 07:50:32AM

You need to have the CHUD tools installed to have access to this application.



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10.5: Monitor and disable CPU cores in 10.5
Authored by: bugmenot on Nov 06, '07 08:11:20AM

This works the same in Tiger, but as noted before, only if you have CHUD Tools installed.



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10.5: Monitor and disable CPU cores in 10.5
Authored by: tbolioli on Nov 06, '07 08:40:25AM

You won't save energy or battery life by turning off a core (and do anything other than let it sit there idle the whole time). You may save instantaneous power in certain circumstances, but if anything, you will end up using more energy over time because shutting down a core will rob you of a variety of performance and energy benefits.



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10.5: Monitor and disable CPU cores in 10.5
Authored by: rmanke on Nov 06, '07 09:02:12AM

This article should be revised to include the fact that it doesn't get installed with Leopard. I don't even think it is on the Leopard DVD.

It's probably also not a 10.5-only feature.



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It's not 10.5-only
Authored by: boredzo on Nov 06, '07 11:16:41AM

I have it in Tiger.

You need only install the CHUD Tools.



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Monitoring CPU performance
Authored by: Chas on Nov 06, '07 09:23:27AM
If you just want to monitor CPU cores' performance, I recommend the freeware program "X Resource Graph."

http://www.gauchosoft.com/Software/X%20Resource%20Graph/

I love this little tool, I keep a graph going of my 4 CPU cores' usage and in/out network activity.

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It does exist in 10.4
Authored by: boredzo on Nov 06, '07 11:19:01AM

It does not exist, at least on my machine, in 10.4 (there's an app called CHUD that will do it, but this is different).

I'm on Tiger (and Leopard, on my other machine) and I have that exact application: /Library/Application Support/HWPrefs/CPUPalette.app. Perhaps you have an old version of the CHUD Tools installed?



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It does exist in 10.4
Authored by: panolex on Nov 07, '07 07:16:29AM

Really it`s exist in Tiger since 10.4.10.



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Careful with this!
Authored by: cheesekeeper on Nov 06, '07 03:52:54PM

I was playing with this, and turned off and on my second core. As soon as I re-enabled the second core, my Mac kernel panicked!

It's a MBP 2.2 GHz with 10.5. It might just be mine, but don't do this while you're doing anything important on your Mac, or have unsaved work!



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10.5: Monitor and disable CPU cores in 10.5
Authored by: Mr.C.Tippins on Dec 08, '07 10:55:58AM

I have a 4 core Mac Pro and messing with this at all totally hoses my machine.
If I turn off even just one core the mouse starts getting laggy/jittery, iTunes music starts skipping, the beach ball starts spinning for all sorts off Apps and a variety of other performance problems spring up.

Guess the Mac Pro wants all of its cores or it gets grumpy.



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