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Detecting CPU Speed

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Detecting CPU Speed

Subject: Detecting CPU Speed
From: Gary Pederson <email@hidden>
Date: Sat, 24 Mar 2007 19:55:25 -0500

I've been detecting CPU speed in my InstallationCheck scripts using `sysctl -n hw.cpufrequency` and `sysctl -n hw.cpufrequency_max`

These are returning the correct values on most machines, but the wrong values on other machines (at least 867MHz G4 PowerBooks in 10.3.9) -- So some of our customers get a confusing message about their CPU being too slow.

On those systems, sysctl returns
	hw.cpufrequency: 533333332
	hw.cpufrequency_min: 533333332
	hw.cpufrequency_max: 533333332
When it should report
	hw.cpufrequency: 867000000
	hw.cpufrequency_min: 533333332
	hw.cpufrequency_max: 867000000

Is there a way to accurately detect the maximum cpu speed on all OS X Macs? Or at least on the ones I need to support (G4, G5, x86 -- 10.3.9 and later)?

Thanks,
Gary Pederson


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