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Old 01-07-2012, 05:28 PM
sean darcy
 
Default F15: named using 90+% cpu

I've a recursive nameserver under no load taking 90% or more of the cpu.
I've restarted, no joy.


There's an rsync task in the background, but nothing else.

What's going on?

sean

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND


12766 named 20 0 237m 27m 2732 S 90.7 2.8 1352:27 named


rndc status
version: 9.8.1-P1-RedHat-9.8.1-3.P1.fc15
CPUs found: 2
worker threads: 2
number of zones: 19
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/0/1000
tcp clients: 0/100
server is up and running

model name : Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz
stepping : 13
cpu MHz : 1200.000
cache size : 2048 KB

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Old 01-07-2012, 10:07 PM
John Wendel
 
Default F15: named using 90+% cpu

On 01/07/2012 10:28 AM, sean darcy wrote:
I've a recursive nameserver under no load taking 90% or more of the
cpu. I've restarted, no joy.


There's an rsync task in the background, but nothing else.

What's going on?

sean

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12766 named 20 0 237m 27m 2732 S 90.7 2.8 1352:27 named


[snip]


strace -p <PID>, might give you a clue.

John


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Old 01-07-2012, 10:26 PM
sean darcy
 
Default F15: named using 90+% cpu

On 01/07/2012 06:07 PM, John Wendel wrote:

On 01/07/2012 10:28 AM, sean darcy wrote:

I've a recursive nameserver under no load taking 90% or more of the
cpu. I've restarted, no joy.

There's an rsync task in the background, but nothing else.

What's going on?

sean

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12766 named 20 0 237m 27m 2732 S 90.7 2.8 1352:27 named


[snip]


strace -p <PID>, might give you a clue.

John




Here's strace. Left it running for about a minute. What could this mean?

strace -p 12766
Process 12766 attached - interrupt to quit
rt_sigsuspend([]^C <unfinished ...>
Process 12766 detached

sean

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Old 01-07-2012, 11:47 PM
John Wendel
 
Default F15: named using 90+% cpu

On 01/07/2012 03:26 PM, sean darcy wrote:

On 01/07/2012 06:07 PM, John Wendel wrote:

On 01/07/2012 10:28 AM, sean darcy wrote:

I've a recursive nameserver under no load taking 90% or more of the
cpu. I've restarted, no joy.

There's an rsync task in the background, but nothing else.

What's going on?

sean

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12766 named 20 0 237m 27m 2732 S 90.7 2.8 1352:27 named


[snip]


strace -p <PID>, might give you a clue.

John




Here's strace. Left it running for about a minute. What could this mean?

strace -p 12766
Process 12766 attached - interrupt to quit
rt_sigsuspend([]^C <unfinished ...>
Process 12766 detached

sean

Since it isn't making any system calls (which would show up in strace),
it must be in a tight loop in the code. Time to attach a debugger, but
to get anything meaningful, you would need to be running a version of
the program compiled with debugging enabled. Maybe someone smarter than
me can offer some more useful advice.


Regards,

John

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