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hwmond is causing up to 70% cpu load after every reboot on several xserves i manage caused by the update to 10.6.8. anybody else having this problem? it can be solved by hwmond -s5 to set the hwmond interval to 5 seconds but this command is not processed properly, is causing an error message "IOConnectMethodScalarIScalra0 call return err = 0xE00002BC" and has to be exited with cmd+c. Also, the com.apple.hwmond.plist in LaunchDaemons is empty.
So, by "help" do you mean they gave you a patch? If you can't say, no problem.
Like many others, my problem resolved itself about a week after upgrading. That's not to say it won't reoccur if I need to reboot the server or something, but for now my CPU is sitting idle.
Not me, still 87% of one core
For me the problem does not resolve after a week and longer, so I decided to stop the process via launchctl unload!
I hope Apple will fix the problem soon.
Apple just released an update to fix this:
I can confirm that the update does indeed fix the issue.
I can confirm the fixed issue with the update too!
To add one more voice to the successes, after installing the Mac OS X Server 10.6.8 Combo Update v1.1, hwmond is back to normal. No CPU usage problems, indicator LEDs appear to be working fine.
It would have been nice of Apple to list this as fixed in the update information, though. I couldn't see it mentioned anywhere, which seems to be fairly typical of their documentation habits at the moment.
Same here. Updated the binary & the kernel extensions that were previously downgraded by using the 10.6.8 Combo Updater & Pacifist to bring everything up to 10.6.8, pre-fix, cleared kernel caches, rebooted, saw hwmond back at 94%, then installed the 10.6.8 Supplemental Update, all's well.
Just a reminder: if you have used launchctl to unload hwmond with the -w switch, you will have to load it again using the -w switch. I had disabled it on my servers per the earlier posts; after applying the patch & rebooting hwmond was still not running, so I ran:
#> sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.hwmond.plist
and it was back, and running at normal levels.
Have you tried ProcessRenicer.app? It is free and lets you change the prioty of any application running.
hwmond high cpu load after 10.6.8 update
