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vtune top down microarchitecture metrics

zytsnlz
Beginner
955 Views

multiple runs the application many times to make sure the vtune collection time was long enough. The sum of Retiring,Front-End Bound,Bad Speculation,Back-End Bound of many functions in the collected results is over 100% a lot. Why?

zytsnlz_0-1664248114932.png

 

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AthiraM_Intel
Moderator
926 Views

Hi,


Thank you for posting in Intel Communities.


We have observed the same issue and we are checking on this internally.


Meanwhile could you please share the below details:


  1. OS details
  2. VTune version
  3. Hardware details


Thanks


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zytsnlz
Beginner
914 Views

OS details

      Linux ICT-01 4.18.0-147.5.1.6.h605.eulerosv2r9.x86_64 #1 SMP Wed Nov 10 09:00:30 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

VTune version

       vtune_profiler_2022.3.0.624050

Hardware details

zytsnlz_0-1664278789845.png

zytsnlz_1-1664279586150.png

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AthiraM_Intel
Moderator
866 Views

Hi,


Thanks for sharing the details. We are working on this internally. We will get back to you with an update.



Thanks


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AthiraM_Intel
Moderator
696 Views

Hi,


Thank you for your patience.


>> The sum of Retiring,Front-End Bound,Bad Speculation,Back-End Bound of many functions in the collected results is over 100% a lot. Why?


This can happen due to the nature of sampling methodology VTune take. In general, sampling methodology will not be able to provide 100% accurate data. Due to the complexities of implementation to cause underestimates or overestimates, use multiple runs option could help approximate more accurate data. In general, the statistical portions of pipeline categories classifications would be meaningful data to try categorizing the performance bottleneck problems.



Hope this clarifies your query.



Thanks.



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AthiraM_Intel
Moderator
621 Views

Hi,


We have not heard back from you. Could you please give us an update?



Thanks


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AthiraM_Intel
Moderator
584 Views

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


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