vtune and optimization flag problem

amk21 — Mon, 16 Apr 2012 10:37:38 GMT

Hi,

I found out that when compileing with -O flag it's does not meter what optimize flag i'm using once -O is specify vtune stop collecting data.

i installed a clean Ubuntu 11.1

amir@ubuntu:~/vtune_intel_test$ uname -a

Linu

x ubuntu 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

==========================================

compile with -O

==========================================

g++ test.cpp -g -I/opt/intel/vtune_amplifier_xe_2011/include /opt/intel/vtune_amplifier_xe_2011/lib64/libittnotify.a -lpthread -ldl -O -o test

amir@ubuntu:~/vtune_intel_test$ rm -Rf r00*; amplxe-cl -collect hotspots -start-paused -- ./test; amplxe-cl -report hotspots r000hs/

Error: Cannot change state

Using result path `/home/amir/vtune_intel_test/r000hs'

Executing actions 16 % Loading data files

Warning: Cannot load data file `/home/amir/vtune_intel_test/r000hs/data.0/11058-11066.0.log' ().

Executing actions 75 % Generating a report

Summary

-------

Elapsed Time: 0.021

CPU Time: 0

Executing actions 100 % done

Using result path `/home/amir/vtune_intel_test/r000hs'

Executing actions 75 % Generating a report

Function Module CPU Time

-------- ------ --------

Executing actions 100 % done

amir@ubuntu:~/vtune_intel_test$

==========================================

compile without

==========================================

amir@ubuntu:~/vtune_intel_test$ g++ test.cpp -g -I/opt/intel/vtune_amplifier_xe_2011/include /opt/intel/vtune_amplifier_xe_2011/lib64/libittnotify.a -lpthread -ldl -o test

amir@ubuntu:~/vtune_intel_test$ rm -Rf r00*; amplxe-cl -collect hotspots -start-paused -- ./test; amplxe-cl -report hotspots r000hs/

Error: Cannot change state

Using result path `/home/amir/vtune_intel_test/r000hs'

Executing actions 16 % Loading data files

Warning: Cannot load data file `/home/amir/vtune_intel_test/r000hs/data.0/11128-11136.0.log' ().

Executing actions 75 % Generating a report

Summary

-------

Elapsed Time: 0.102

CPU Time: 0.027

Executing actions 100 % done

Using result path `/home/amir/vtune_intel_test/r000hs'

Executing actions 75 % Generating a report

Function Module CPU Time

------------------ ------ --------

foo_data_collected test 0.027

Executing actions 100 % done

this is the test.cpp code

//test.cpp : Defines the entry point for the console application.

#include "ittnotify.h"

void foo_data_collected()

{

for (int i=0; i<10000000L; i++);

}

void foo_data_not_collected()

{

for (int i=0; i<10000000L; i++);

}

int main(int argc, char* argv[])

{

// Assume that data collector was paused in user interface

foo_data_not_collected();

// Now resume data collecting

__itt_resume();

foo_data_collected();

// Pasue data collecting again

__itt_pause();

foo_data_not_collected();

// Resume data collecting again

__itt_resume();

foo_data_collected();

// The user shouldn't see data collecting in foo_data_not_collected() in result

return 0;

}

how can i use vtune whith -O2 or -O3 ?

Regards

Amir

vtune and optimization flag problem

Rob5 — Mon, 16 Apr 2012 17:13:49 GMT

Amk21,

This new forum post appears to be a duplicate of forum thread hereyou posted which is in process. Let us know if this is not the case.

- Rob

vtune and optimization flag problem

amk21 — Mon, 16 Apr 2012 18:15:54 GMT

this is more direct question way gcc optimization flag cause vtune to stop collecting in the previous post there where several issues

vtune and optimization flag problem

Peter_W_Intel — Tue, 17 Apr 2012 05:22:33 GMT

I never use option "-Ox" when I tried Resume/Pause API. But I think this should be a probelm.

I have reported this problem to engineering team, and willupdate on this thread if any progress.

Currently, workaround is not to use "-Ox" when using Resume/Pause API.

Regards, Peter

vtune and optimization flag problem

amk21 — Tue, 17 Apr 2012 08:17:25 GMT

i think i figure the problem the functions are inline when using -Ox flag

vtune and optimization flag problem

TimP — Wed, 18 Apr 2012 21:56:23 GMT

Inlined functions will cause the associated data to be associated with a calling function. So it's often useful to disable in-lining for profiling.

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