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Re: AFP eating up CPU

by Dan Shoop :: Rate this Message:

On Oct 14, 2008, at 11:47 AM, Dan Rader wrote:

I was experiencing this problem as well. I found a DNS error and fixed it
and then restarted the server. This has taken care of my CPU maxing out
problem until yesterday.

I got a call around noon that weird things were happening to my logged in
users. There docs were disappearing and wallpaper pictures were gone, etc.
The secretary in that building told everybody to shut down their
computers until further notice. Since I didn't actually see this
weirdness I told a couple of users to turn their computers back on and log
in. It appears as though they had lost there doc prefs, sidebar prefs,
and background prefs. These were the things that were immediately
noticeable. I found out later that most of them have Firefox profile
issues as well.

This morning I noticed that my CPU % has been over 50% overnight
when nobody is supposed to be here and shouldn't have anything going on
and this morning it has been averaging around 75% and looks like it is
slowly creeping up.

I don't want to have to restart the server again. My users are getting
frustrated. Has anyone found any solutions?

You presume that there's a single cause to this. Unfortunately it's not that simple. Your problem is likely different from others.

Given dtrace and sc_usage you can look deeper.

Remember though that %CPU is not a metric, and if a process is consuming most all the CPU that this implies there's no other processes that are competing for CPU significantly.

What normally you find is that when processes are using "excessive" cpu that they're spending a large amount of system time, which indicates something fundamental wrong, like latency issues, bad DNS, misconfiguration etc. It's spending time there b/c it's made system calls that aren't getting serviced. Find out why and you solve your mystery. Other issues occur when you've got waits that never return. That indicates, again, something fundamental that's out of line or problematic.

Guess my overall suggestion is that the issue isn't really with AFP but something in the system that's not right.

-d

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Dan Shoop

Computer Scientist

iWiring / U.S. Technical Services

shoop@...

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