oprofile-list

Help needed

[Giri P. <sha...@gm...>]

1) I installed operf in linux machine, below is the version:

operf: oprofile 1.3.0 compiled on Feb  2 2020 20:33:34

2) I wrote a simple program and ran : *operf ./a.out*

3) it generated the folder: *oprofile_data*

4) when i run opreport as below:




*##> opreport session:oprofile_data event:DATA_MEM_REFSUsing
/home/prasadgi/tools/cpp/oprofile_data/samples/ for samples
directory.opreport error: No sample found: Please specify a session
containingsample data.*

*Please help what is missing ?*

Regards,
Giri Prasad

Re: Help needed

[William C. <wc...@re...>]

On 4/5/22 05:59, Giri Prasad wrote:
> 1) I installed operf in linux machine, below is the version:
> 
> operf: oprofile 1.3.0 compiled on Feb  2 2020 20:33:34
> 
> 2) I wrote a simple program and ran : *operf ./a.out*
> 
> 3) it generated the folder: *oprofile_data*
> *
> *
> 4) when i run opreport as below:
> *
> *
> *##> opreport session:oprofile_data event:DATA_MEM_REFS
> Using /home/prasadgi/tools/cpp/oprofile_data/samples/ for samples directory.
> opreport error: No sample found: Please specify a session containing
> sample data.*
> *
> *
> *Please help what is missing ?*
> *
> *
> Regards,
> Giri Prasad
> 
> 
> _______________________________________________
> oprofile-list mailing list
> opr...@li...
> https://lists.sourceforge.net/lists/listinfo/oprofile-list

Hi,

By default operf is going to use a clock cycle event to record samples .   You should see samples if you do "opreport".  However, if the program runs for a very short amount of time there might not be enough events (cycles) to trigger a sample.  If you want to get samples of the DATA_MEM_REFS you are going to need to specify the events with the --events / -e option for operf:


https://oprofile.sourceforge.io/doc/controlling-profiler.html#controlling-operf

You might also consider using linux perf:

https://perf.wiki.kernel.org/index.php/Main_Page

-Will

Re: Help needed

[will s. <wil...@vn...>]

On Tue, 2022-04-05 at 15:29 +0530, Giri Prasad wrote:
> 
> 1) I installed operf in linux machine, below is the version:
> 
> operf: oprofile 1.3.0 compiled on Feb  2 2020 20:33:34
> 

> 2) I wrote a simple program and ran : operf ./a.out
> 
> 3) it generated the folder: oprofile_data
> 
> 4) when i run opreport as below:
> 
> ##> opreport session:oprofile_data event:DATA_MEM_REFS
> Using /home/prasadgi/tools/cpp/oprofile_data/samples/ for samples
> directory.
> opreport error: No sample found: Please specify a session containing
> sample data.
> 
> Please help what is missing ?

 
Most likely the program did not run long enough or simply did not
trigger any DATA_MEM_REFS events.

Does opreport give you any output if
you leave off the "event:" qualifier? 

Thanks
-Will (Schmidt)


> 
> Regards,
> Giri Prasad
> _______________________________________________
> oprofile-list mailing list
> opr...@li...
> https://lists.sourceforge.net/lists/listinfo/oprofile-list

Re: Help needed

[Giri P. <sha...@gm...>]

Thanks a lot Will and William for your responses. My apologies for being
novice in this aspect:

1) My program looks like this. [Just to learn operf]
























*#include <iostream>using namespace std;void fun1(){  for(auto i = 0; i <
1000000000; i++) {     std::cout << "Fun1" << endl;  }}void fun2(){
for(auto i = 0; i < 1000000000; i++) {     std::cout << "Fun2" << endl;
}}int main(){   fun1();   fun2();}*


2) I ran the command : *operf -g ./a.out*

3) It ran for almost 20 minutes and then I killed the process.

4) Can you please let me know how to run opreport to : get the call graph *with
details of Functions fun1 and fun2 *with details such as *how many cycles
they consumed, how many times they're called* etc.

Regards,
Giri Prasad


On Tue, Apr 5, 2022 at 9:16 PM will schmidt <wil...@vn...>
wrote:

> On Tue, 2022-04-05 at 15:29 +0530, Giri Prasad wrote:
> >
> > 1) I installed operf in linux machine, below is the version:
> >
> > operf: oprofile 1.3.0 compiled on Feb  2 2020 20:33:34
> >
>
> > 2) I wrote a simple program and ran : operf ./a.out
> >
> > 3) it generated the folder: oprofile_data
> >
> > 4) when i run opreport as below:
> >
> > ##> opreport session:oprofile_data event:DATA_MEM_REFS
> > Using /home/prasadgi/tools/cpp/oprofile_data/samples/ for samples
> > directory.
> > opreport error: No sample found: Please specify a session containing
> > sample data.
> >
> > Please help what is missing ?
>
>
> Most likely the program did not run long enough or simply did not
> trigger any DATA_MEM_REFS events.
>
> Does opreport give you any output if
> you leave off the "event:" qualifier?
>
> Thanks
> -Will (Schmidt)
>
>
> >
> > Regards,
> > Giri Prasad
> > _______________________________________________
> > oprofile-list mailing list
> > opr...@li...
> > https://lists.sourceforge.net/lists/listinfo/oprofile-list
>
>