OProfile

Forgot to mention: I am running oprofile on a RHAS5.0 distribution.


On Wed, 2007-12-19 at 09:23 +0200, Eli Cohen wrote:
> Hi,
> 
> I am trying to profile a network driver for cache misses. I use the
> following command:
> opcontrol -e DATA_CACHE_ACCESSES:50000 --start
> 
> After I stop the profiler and get a report I see the message:
> CPU: AMD64 processors, speed 2400 MHz (estimated)
> Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a
> unit mask of 0x00 (No unit mask) count 100000
> 
> Which looks like it sampled the default counter.
> 
> Can someone tell what an I doing wrong. Also please someone explain the
> exact meaning of the count value (I just chose this arbitrarily).
> 
> Thanks.
> 
> 
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Eli Cohen wrote:
> Forgot to mention: I am running oprofile on a RHAS5.0 distribution.
> 
> 
> On Wed, 2007-12-19 at 09:23 +0200, Eli Cohen wrote:
>> Hi,
>>
>> I am trying to profile a network driver for cache misses. I use the
>> following command:
>> opcontrol -e DATA_CACHE_ACCESSES:50000 --start
>>
>> After I stop the profiler and get a report I see the message:
>> CPU: AMD64 processors, speed 2400 MHz (estimated)
>> Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a
>> unit mask of 0x00 (No unit mask) count 100000
>>
>> Which looks like it sampled the default counter.
>>
>> Can someone tell what an I doing wrong. Also please someone explain the
>> exact meaning of the count value (I just chose this arbitrarily).
>>
>> Thanks.

Is it possible that the OProfile was already running? You might try the 
following to make sure that the new event is used and there are no samples from 
previous configurations:

opcontrol --shutdown
opcontrol --reset

Then do the:

opcontrol -e DATA_CACHE_ACCESSES:50000 --start

-Will

> Is it possible that the OProfile was already running? You might try the 
> following to make sure that the new event is used and there are no samples from 
> previous configurations:
> 
> opcontrol --shutdown
> opcontrol --reset
> 
> Then do the:
> 
> opcontrol -e DATA_CACHE_ACCESSES:50000 --start


Yes oprofile was running and your suggestions solved the problem. Do I
have to shutdown whenever I change logged events?