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William_H_7
Beginner
34 Views

how to find where my program is spinning?

Hello,

I have looked through the forums and other TBB resources and based on vtune I can see my program is spending a lot of time spinning but I have not found out where it is spinning yet.

I have parallel studio and would appreciate any advice on how to find out where the program is spinning so I can fix it. Overall it seems my parallelization is not very well balanced and I am trying to figure out where the problems are.

If this kind of thing is caused by one thread doing a lot of work and the others running out of work if I can find out where that is happening there are some tasks I can break up more finely at the cost of a small amount of memory.

I am using TBB + the TBB version of MKL for BLAS and LAPACK calls. 

vtune spin.PNG

Thank you for the help

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2 Replies
Dmitry_P_Intel1
Employee
34 Views

Hello,

Could you please switch stack attribution to "User/System" from default "User function +1" and provide the new picture?

It can be done with "Call Stack Mode" knob on filer bar:

Filter_0.png

Thank you, Regards, Dmitry

William_H_7
Beginner
34 Views

Thank you for looking at this.

vtune spin 2_0.PNG

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