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How to disable one CPU on dual-processor g4?
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Addicted to MacNN
Join Date: Jan 2001
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Trying to isolate the cause of random KP's. I'm thinking it's gotta be logic board or a CPU by this point (been through all the RAM chips and peripherals) Is there any way to disable one CPU on these things?
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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I don't remember the commands, but there are Open Firmware commands to disable one CPU. I don't know if you can tell it which CPU to disable, though! (The function is there to test software that isn't multiprocessing compatible.)
tooki
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Professional Poster
Join Date: Feb 2000
Location: Nashua NH, USA
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One of the CHUD tools will do it. Don't remember which one.
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Clinically Insane
Join Date: Oct 2001
Location: San Diego, CA, USA
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Just install CHUD and it puts a pane in System Preferences that lets you disable a processor.
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Chuck
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"Instead of either 'multi-talented' or 'multitalented' use 'bisexual'."
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Addicted to MacNN
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Originally Posted by Chuckit
Just install CHUD and it puts a pane in System Preferences that lets you disable a processor.
Okay-- got that-- no way through Terminal or whatever to specify WHICH one, so I can get some sort of verification?
If I disable one processor without knowing which one I'm disabling, and my problems persist, I won't know whtether I've disabled the good processor, or if the problem resides elsewhere. I guess as is, though, this gives me about 25% odds of isolating it.
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Addicted to MacNN
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I've found the problem-- the fan on the power supply has stopped working, and the machine is overheating. Thr CPUs are right up against the power supply on a Quicksilver, and the ambient temp in there is just too high. It's been running okay with one CPU, but I need to get the fan fixed.
Pulling the power supply doesn't look too hard, but can I change the fan in it myself, or is this a job for a qualified service peson, or can the fan even be changed?
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Addicted to MacNN
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Mac Elite
Join Date: Aug 2001
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I have to say, that's some pretty impressive troubleshooting. Nice work.
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