Does vtune work on isolated cpu?

[tedqian]

Can anyone please share if vtune can inspect processes on an isolated CPU?  It seems vtune cannot get information out of a process if it pins to the isolated CPU(100% used).

OS:Centos 7.9

VTune Profiler 2022.3.0(build 624050) 

[JaideepK_Intel]

Hi,

Thank you for posting in Intel communities.

To understand your issue better please answer the below questions.

• Are you running Vtune as a sudo/root user?
• Are you trying to attach to the process (i.e., by using the target pid flag)? If yes, while running Vtune, does it hang or throw any errors? Please attach valid screenshots.
• Are you facing the issue with default samples (matrix multiplication) or specific to one sample? If it was specific to one sample please attach a sample reproducer(exact replica of the original sample) as well.
• We can see you are using an older version of Vtune could you please upgrade also the os which you are using is also deprecated with the latest version of Vtune.
• Please run the below command and attach the log file as well.

sh <oneapi_install_directory>/vtune/latest/bin64/vtune-self-checker.sh

(eg: sh /opt/intel/oneapi/vtune/latest/bin64/vtune-self-checker.sh)

Thanks,

Jaideep

[tedqian]

Hi，

Is there any progress on the problem？

Thanks，

Tedqian

[tedqian]

Hi,

 Sorry for the late reply.

• Are you running Vtune as a sudo/root user?

       //yes, root

• Are you trying to attach to the process (i.e., by using the target pid flag)? If yes, while running Vtune, does it hang or throw any errors? Please attach valid screenshots.

      //see the vtune_output.txt

• Are you facing the issue with default samples (matrix multiplication) or specific to one sample? If it was specific to one sample please attach a sample reproducer(exact replica of the original sample) as well.

       //no

• We can see you are using an older version of Vtune could you please upgrade also the os which you are using is also deprecated with the latest version of Vtune.

       //i will try 

• Please run the below command and attach the log file as well.

       //see log.txt

thanks

[JaideepK_Intel]

Hi,

Yes, Vtune works on an Isolated CPU.

Since you are using a sample that runs in less amount of time you are facing this issue. From the above log, we can see the elapsed time is 0.00 seconds because of that there is no data collected. Can you try with a sample that runs for at least 30 seconds?

Please try to run Vtune as root/sudo user

vtune -collect performance-snapshot <path to that binary/sample>

Thanks,

Jaideep

[tedqian]

Hi,

The vtune_out.log show that elapsed time is 0.00 seconds, but the command i run with root is: 

"vtune -collect performance-snapshot -target-pid=20834 -d 240 -result-dir ./", which will collect 240 seconds performance data.

So maybe vtune doesnt work on isolated cpu with is always 100%?

Thanks,

tedqian

[JaideepK_Intel]

Hi,

Vtune works on isolated CPUs as well, Instead of attaching the process(using target pid) can you try to run Vtune with the below command and share the results?

vtune -collect performance-snapshot -result-dir ./ <path_to the_binary/executable>

From the self-checker log we can see all the analysis are working fine without any issues, we assume the sample which you are running is too small.

To understand your issue better attach your sample reproducer, so we can replicate the same issue from our end.

Thanks,

Jaideep

[tedqian]

Hi,

I run the below  command  with 10 minutes: 

vtune -collect performance-snapshot -result-dir ./ <path_to the_binary/executable>

Then i want to stop vtune with the command but it fail.

[root@168-61-53-2 vtunetest]# vtune -command stop -r ./
^Cvtune: Error: Cannot handle the given command due to an internal error.
vtune: Internal Error

So i use kill command to end the vtune.The attachment is result.

Thanks,

Tedqian

[JaideepK_Intel]

Hi,

We are unable to reproduce your issue from our end and everything works fine for us, inorder to understand better could you share your sample reproducer(exact replica of your sample)?

We can see your self-checker log is working fine. So we assume maybe bcoz of the sample you are using.

Thanks,

Jaideep

[JaideepK_Intel]

Hi,

Could you please share the details mentioned above?

Thanks,

Jaideep

[JaideepK_Intel]

Hi,

We have not heard back from you. This thread will no longer be monitored by Intel. If you need further assistance, please post a new question.

Thanks,

Jaideep