Re: Help with initial setup

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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