Intel Advisor 2021.1 : What are the percentage numbers next to each module under module filter?

[mikeitexpert]

Intel Advisor 2021.1 :

What are the percentage numbers next to each module under module filter?

Please let me know.

[Ruslan_M_Intel]

It's amount of time spent within corresponding module

[mikeitexpert]

Thanks for the input ... 

Do you think it is a sign for over parallelization? If so, how would I be able to better  track down the problem? I speculate it has too do with forcing parallelizing using #pragma omp parallel for ... so I may consider using if clauses just to avoid unnecessary parallel execution. However, I am not sure how to verify my guess ... 

Please let me know what you think ... 

Regards

[Ruslan_M_Intel]

Yes, the overhead you faced with can be caused by the reason you are talking about. You can try playing with OMP_NUM_THREADS env var (e.g. 1, 4 and

[mikeitexpert]

Ruslan,

Thanks for the comment I lowered the number of threads to 1 and it turns out it reduces libiomp5md.dll time. Though I am not sure whether it is a good sign or bad sign ??? I am just trying to find whether I have unnecessary parallelizing or not.

[Ruslan_M_Intel]

Probably you need to go through Threading Workflow then. Check this out - https://software.intel.com/content/www/us/en/develop/videos/introduction-to-intel-advisor-threading-workflow.html

[mikeitexpert]

Is there any way to force IA (Intel Advisor) use omp debug dlls just to better find out ? I am not sure how I can use debug dlls....

I have tried below but no luck .... 

[Ruslan_M_Intel]

Unfortunately, no. Advisor doesn't do anything like that. Could you tell what you're going to achieve doing that?

[RashmiP_Intel · Accepted solution]

Hi,

Intel® VTune™ Profiler optimizes application performance, system performance, and system configuration for HPC, cloud, IoT, media, storage, and more.

So you can also use vtune for this question.

You can refer to https://software.intel.com/content/www/us/en/develop/documentation/vtune-cookbook/top/tuning-recipes/openmp-imbalance-and-scheduling-overhead.html this cookbook.

Regards,

Rashmi

[mikeitexpert]

Feel free to close the thread ...

Thank you

[RashmiP_Intel]

Hi,

Thanks for accepting our solution. If you need any additional information, please submit a new question as this thread will no longer be monitored.

Regards,

Rashmi