On 07/20/2011 05:41 PM, Shay Cohen wrote:

Hi,

Thanks for the quick reply.

I've been doing step-by-step as mentioned in Will's tutorial, and checked the 'samples_received' and NMI values after some load.

Still all counters are 'zeroed' and the 'samples' directory is empty. Attaching an output snap.

[root <at> new-host-5 hello-2.7]# opcontrol --setup --vmlinux=/usr/lib/debug/lib/modules/2.6.18-164.el5/vmlinux  --event=CPU_CLK_UNHALTED:16000000:0:1:1 --separate=library

Jul 21 03:34:30 new-host-5 kernel: oprofile: using NMI interrupt.

[root <at> new-host-5 hello-2.7]# opcontrol --save=kuku2

[root <at> new-host-5 hello-2.7]# opcontrol --start

Using 2.6+ OProfile kernel interface.

Reading module info.

Using log file /var/lib/oprofile/samples/oprofiled.log

Daemon started.

Profiler running.

[root <at> new-host-5 hello-2.7]# time ./configure >/dev/null ; make clean>/dev/null ;make>/dev/null

real0m34.417s

user0m7.709s

sys0m24.552s

[root <at> new-host-5 hello-2.7]# cat /dev/oprofile/stats/cpu0/sample_received

0

[root <at> new-host-5 hello-2.7]# grep NMI /proc/interrupts

NMI:          0

[root <at> new-host-5 hello-2.7]# ls -l /var/lib/oprofile/samples/kuku2/

total 0

[root <at> new-host-5 hello-2.7]# opreport

opreport error: No sample file found: try running opcontrol --dump

or specify a session containing sample files

[root <at> new-host-5 hello-2.7]# opcontrol --dump

[root <at> new-host-5 hello-2.7]# opreport

opreport error: No sample file found: try running opcontrol --dump

or specify a session containing sample files

Thanks

Hi,

Which processor is this on? What is the output of "cat /proc/cpuinfo"? Also how many cores (processors) are on the machine? I am wondering by chance if this machine has 6 cores per socket.

-Will

On Jul 20, 2011, at 11:03 PM, William Cohen wrote:

On 07/20/2011 03:39 PM, shayco wrote:

Hi,

I'm trying to get a 'taste' of OProfile with Centos 5.x.

Done the following:

- Installed OProfile

- Downloaded the vmlinux for my kernel version

For some reason, OProfile does not generate data at all.

Tried running GNU's 'hello' for a few hundred times, tried running httpd and

ab - nothing.

As far as I can tell, this is not listed under the OProfile FAQ and I could

not find anything useful to me in the forums/mailing lists

Hi,

The interval of 6000 is very small for CPU_CLK_UNHALTED, that should be higher to avoid overloading the system.

There are a couple OProfile tutorials at:

http://people.redhat.com/wcohen/

Take a look at your /var/log/messages for messages related to oprofile see that it is setting up the oprofile module correctly.

You might take a look at the /dev/oprofile/stats/cpu[0-9]*/samples_received files to see if there are any samples being recorded.

When oprofile is running using the performance counters it should use the nmi interrupt. Take a look at /proc/interrupts to see if there are nmi interrupts occuring.

-Will

The best I can do to describe my problem is as following:

[root <at> new-host-2 ~]# opcontrol --status

Daemon running: pid 6221

Event 0: CPU_CLK_UNHALTED:6000:0:1:1

Separate options: library

vmlinux file: /usr/lib/debug/lib/modules/2.6.18-164.el5/vmlinux

Image filter: none

Call-graph depth: 0

[root <at> new-host-2 ~]# opcontrol --start

Profiler running.

[root <at> new-host-2 ~]# while : ; do hello > /dev/null ; ((COUNT++)); done

[root <at> new-host-2 ~]# echo $COUNT

1797

[root <at> new-host-2 ~]# opreport

opreport error: No sample file found: try running opcontrol --dump

or specify a session containing sample files

[root <at> new-host-2 ~]# ls -l /var/lib/oprofile/samples/kuku/

total 0

[root <at> new-host-2 ~]# ls -l /var/lib/oprofile/samples/

total 20

drwxr-xr-x 2 root root 4096 Jul 18 15:25 kuku

-rw-r--r-- 1 root root 4647 Jul 19 00:20 oprofiled.log

[root <at> new-host-2 ~]# cat /root/.oprofile/daemonrc

SESSION_DIR=/var/lib/oprofile

CHOSEN_EVENTS_0=CPU_CLK_UNHALTED:6000:0:1:1

NR_CHOSEN=1

SEPARATE_LIB=1

SEPARATE_KERNEL=0

SEPARATE_THREAD=0

SEPARATE_CPU=0

VMLINUX=/usr/lib/debug/lib/modules/2.6.18-164.el5/vmlinux

IMAGE_FILTER=

CPU_BUF_SIZE=0

CALLGRAPH=0

KERNEL_RANGE=c0401000,c061aaa8

XENIMAGE=none

[root <at> new-host-2 ~]# uname -a

Linux new-host-2 2.6.18-164.el5 #1 SMP Thu Sep 3 03:33:56 EDT 2009 i686 i686

i386 GNU/Linux

I'de appreciate any help.

Thanks!

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