perf with gnuplot

perf with gnuplot

[Thorsten Schuett]

Hi,

I record three different events for my test-program:
perf record -s -e cycles,instructions,LLC-load-misses ./test-program

I want to plot the occurences of the different events over time, i.e. 
x-axis is time and y-axis is event count.

With
perf report -D
I can dump perf.data to ASCII. However, I could not figure out how to 
extract different event types from the ASCII output.

0x1edb88 [0x30]: event: 9
.
. ... raw event: size 48 bytes
.  0000:  09 00 00 00 02 00 30 00 43 b6 2f e7 52 2b 00 00 ......0.C./.R+..
.  0010:  2b 20 01 00 2f 20 01 00 2e 21 8e 48 b4 a9 26 00  + ../ ...!.H..&.
.  0020:  f6 6d 00 00 00 00 00 00 6b 60 63 00 00 00 00 00 .m......k`c.....
.
10882640891486510 0x1edb88 [0x30]: PERF_RECORD_SAMPLE(IP, 2): 
73771/73775: 0x2b52e72fb643 period: 6512747 addr: 0

I figured out how to parse the timestamp, pid and pid and I guess period 
says how often an event happened in the period. However I do not know 
which event occured. Is this only encoded in the raw event or am I 
missing something?

Thorsten

Re: perf with gnuplot

[Namhyung Kim]

Hi Thorsten,

On Wed, 23 Jan 2013 13:38:00 +0100, Thorsten Schuett wrote:
> Hi,
>
> I record three different events for my test-program:
> perf record -s -e cycles,instructions,LLC-load-misses ./test-program
>
> I want to plot the occurences of the different events over time,
> i.e. x-axis is time and y-axis is event count.
>
> With
> perf report -D
> I can dump perf.data to ASCII. However, I could not figure out how to
> extract different event types from the ASCII output.
>
> 0x1edb88 [0x30]: event: 9
> .
> . ... raw event: size 48 bytes
> .  0000:  09 00 00 00 02 00 30 00 43 b6 2f e7 52 2b 00 00 ......0.C./.R+..
> .  0010:  2b 20 01 00 2f 20 01 00 2e 21 8e 48 b4 a9 26 00  + ../ ...!.H..&.
> .  0020:  f6 6d 00 00 00 00 00 00 6b 60 63 00 00 00 00 00 .m......k`c.....
> .
> 10882640891486510 0x1edb88 [0x30]: PERF_RECORD_SAMPLE(IP, 2):
> 73771/73775: 0x2b52e72fb643 period: 6512747 addr: 0
>
> I figured out how to parse the timestamp, pid and pid and I guess
> period says how often an event happened in the period. However I do
> not know which event occured. Is this only encoded in the raw event or
> am I missing something?
>
> Thorsten

There's a patch proposed for this.  I guess it'll likely get merged soon
so that you can use it in v3.9?

  http://thread.gmane.org/gmane.linux.kernel/1427078/

Thanks,
Namhyung

Re: perf with gnuplot

[Thorsten Schuett]

This sounds great.

Thanks,
   Thorsten

On 01/24/2013 07:06 AM, Namhyung Kim wrote:
> Hi Thorsten,
>
> On Wed, 23 Jan 2013 13:38:00 +0100, Thorsten Schuett wrote:
>> Hi,
>>
>> I record three different events for my test-program:
>> perf record -s -e cycles,instructions,LLC-load-misses ./test-program
>>
>> I want to plot the occurences of the different events over time,
>> i.e. x-axis is time and y-axis is event count.
>>
>> With
>> perf report -D
>> I can dump perf.data to ASCII. However, I could not figure out how to
>> extract different event types from the ASCII output.
>>
>> 0x1edb88 [0x30]: event: 9
>> .
>> . ... raw event: size 48 bytes
>> .  0000:  09 00 00 00 02 00 30 00 43 b6 2f e7 52 2b 00 00 ......0.C./.R+..
>> .  0010:  2b 20 01 00 2f 20 01 00 2e 21 8e 48 b4 a9 26 00  + ../ ...!.H..&.
>> .  0020:  f6 6d 00 00 00 00 00 00 6b 60 63 00 00 00 00 00 .m......k`c.....
>> .
>> 10882640891486510 0x1edb88 [0x30]: PERF_RECORD_SAMPLE(IP, 2):
>> 73771/73775: 0x2b52e72fb643 period: 6512747 addr: 0
>>
>> I figured out how to parse the timestamp, pid and pid and I guess
>> period says how often an event happened in the period. However I do
>> not know which event occured. Is this only encoded in the raw event or
>> am I missing something?
>>
>> Thorsten
> There's a patch proposed for this.  I guess it'll likely get merged soon
> so that you can use it in v3.9?
>
>    http://thread.gmane.org/gmane.linux.kernel/1427078/
>
> Thanks,
> Namhyung
>

Re: perf with gnuplot

[Thorsten Schuett]

After thinking about it, I have some questions/suggestions:

I would really like to see this work with record/report as well. In my 
case,
I  have to watch programs on a remote machine and do the analysis
afterwards on my local machine. The record/report workflow seems to
be more flexible here. I guess perf.data is a more compact file than the
interval counter printing and I can experiment with different parameters on
the report command.

Is this going to work with -s as well?

Thorsten

On 01/24/2013 07:06 AM, Namhyung Kim wrote:
> Hi Thorsten,
>
> On Wed, 23 Jan 2013 13:38:00 +0100, Thorsten Schuett wrote:
>> Hi,
>>
>> I record three different events for my test-program:
>> perf record -s -e cycles,instructions,LLC-load-misses ./test-program
>>
>> I want to plot the occurences of the different events over time,
>> i.e. x-axis is time and y-axis is event count.
>>
>> With
>> perf report -D
>> I can dump perf.data to ASCII. However, I could not figure out how to
>> extract different event types from the ASCII output.
>>
>> 0x1edb88 [0x30]: event: 9
>> .
>> . ... raw event: size 48 bytes
>> .  0000:  09 00 00 00 02 00 30 00 43 b6 2f e7 52 2b 00 00 ......0.C./.R+..
>> .  0010:  2b 20 01 00 2f 20 01 00 2e 21 8e 48 b4 a9 26 00  + ../ ...!.H..&.
>> .  0020:  f6 6d 00 00 00 00 00 00 6b 60 63 00 00 00 00 00 .m......k`c.....
>> .
>> 10882640891486510 0x1edb88 [0x30]: PERF_RECORD_SAMPLE(IP, 2):
>> 73771/73775: 0x2b52e72fb643 period: 6512747 addr: 0
>>
>> I figured out how to parse the timestamp, pid and pid and I guess
>> period says how often an event happened in the period. However I do
>> not know which event occured. Is this only encoded in the raw event or
>> am I missing something?
>>
>> Thorsten
> There's a patch proposed for this.  I guess it'll likely get merged soon
> so that you can use it in v3.9?
>
>    http://thread.gmane.org/gmane.linux.kernel/1427078/
>
> Thanks,
> Namhyung
>