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Pause Classic when not in use Classic
Occasionally, I still need to run some apps in Classic. When I do, it's annoying that Classic uses a good chunk of my CPU (30%-60%) even when it's in the background doing nothing. One fix for this is to pause Classic by sending the TruBlueEnvironment process a stop signal, like so:
killall -STOP TruBlueEnvironment
This will pause Classic so that it doesn't eat your CPU. When you're ready to use Classic again, unpause it by doing this:
sudo killall -CONT TruBlueEnvironment
You have to use sudo because attempting to restart the process as a regular user will result in an "Operation not permitted" error. I haven't yet been able to figure out why this is.

[robg adds: You can use this technique to pause any process, as explained in this hint.]
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Pause Classic when not in use | 5 comments | Create New Account
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The following comments are owned by whoever posted them. This site is not responsible for what they say.
use app.stop
Authored by: nick on Jul 20, '05 10:16:29AM

there's a freeware application called "app stop" which provides a gui for that:

i'm not related to the author.

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Another app is Cunning Fox
Authored by: PopMcGee on Jul 20, '05 10:47:35AM
Pause Classic when not in use
Authored by: simsamsep on Jul 20, '05 02:48:48PM

In "Classic" system preference panel you can set Classic to sleep if not used for a set number of minutes. TruBlueEnvironme will use very little processor time when Classic is sleeping, at this moment on my PowerBook only 0.10%. Launching a Classic application will immediately wake Classic.

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Use Quicksilver
Authored by: Swordfish on Jul 21, '05 12:16:14PM

Quicksilver provides a "Stop Execution" action which stops all CPU activity for the selected app, and a "Continue Execution" action to resume using the app

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Using Quicksilver to suspend EVERYTHING!
Authored by: dzurn on Jul 21, '05 06:21:52PM

Wow, sounds neat.

So I tried using QuickSilver to pause Classic to see if it worked. I started QS, typed "Classic" and selected Classic Support (sounded right), I hit tab and selected Suspend Execution.

It stopped Classic, all right. However, it also stopped Entourage, Finder, Dock, Safari, InDesign CS, Photoshop CS, Illustrator CS, Adobe Acrobat, QuickSilver, DiskTracker, PageMaker, and TextEdit too.

I couldn't do ANYTHING.

The cursor moved around the screen, but nothing else worked. No clicks anywhere did anything. Command-tab did nothing. Menus did nothing. I had to hit the Power button to restart since I couldn't even get to QuickSilver to tell it to resume.

So be careful what you suspend. :(

Madness takes its toll.
Please have exact change.

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