Kain, Becki (B.) wrote:
The system is really sluggish, like to log in on the console. The top
processes are all httpd processes that aren't letting go of the cpu's.
that might be okay but I doubt it.
Yes, they are letting go of the CPU.. if they weren't you
wouldn't be able to log in.
Is this machine used for anything other than serving web pages?
Thanks. I am trying to send this back to the web guys to look at
It just might be that the machine has a very high traffic
load, in which case it's doing what it's supposed to.
By the way, your name seems familiar -- did you ever
work in Larry Kalley's group in the PDC building?
-----Original Message-----
From: Aaron Kulkis [mailto:[EMAIL PROTECTED]
Sent: Monday, January 14, 2008 12:42 PM
To: opensuse
Subject: Re: [opensuse] Top/lsof
Kain, Becki (B.) wrote:
Thanks. I have a user who is very upset about this web server. Other
ideas for figuring out what is pegging the pu's?
it really doesn't matter if one CPU is pegged or not...
as long as there are clock-cycles available.
Some software is "bursty"... the nature of the problem
causes the software to run flat out, and will get lucky
that nothing else is schedule-able...and will get scheduled
AGAIN...and thus momentarily peg CPU usage....
That's not bad...it's GOOD.. you're getting maximum
CPU throughput.
The question is...how is the system RESPONDING????
if you want to see which processes are hitting the CPU
the hardest...just look at the list of processes that
start on line 5 or so of top's display...
The processes at the top of the list are the ones using
the highest percentage of CPU time during the most
recent polling period (default 1 second)
-----Original Message-----
From: Aaron Kulkis [mailto:[EMAIL PROTECTED]
Sent: Friday, January 11, 2008 2:18 PM
To: opensuse
Subject: Re: [opensuse] Top/lsof
Kain, Becki (B.) wrote:
I read the man page of top but it's not helpful for this question.
When
top tells me cpu0 is being used 50.0% by sys, cpu1 is being used
65.7%
by system space, how do I break down what processes are making up
that
65.7%, in system space, of the cpu? And in lsof, how do you tell
which
cpu a process id's threads are tied to?
One, you can't
Two, it doesn't matter much.
"sys" merely correlates to time spent executing
system-calls (i.e. kernal calls), whereas "user"
correlates to the time spent executing code outside
of the kernel.
As far as lsof... try this:
ps -ef | grep lsof
once you get the PID of the lsof process(es), you
can grep for them:
ps -ef | grep _PID_of_lsof_goes_here
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