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Old 07-14-2015, 11:23 PM   #1
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Registered: Jul 2009
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Query about a strange 'perf top' output

I'm running a C++ program (HPCG benchmark) on an ARM processor based board (Juno) with 64-bit Fedora 21 OS.
When I run perf top in another terminal to find which functions are taking more CPU time, I get an output like below.

75.84 xhpcg [.] ComputeSYMGS_ref
22.27% xhpcg [.] ComputeSPMV_ref
1.14% xhpcg [.] ComputeWAXPBY_ref
0.40% xhpcg [.] ComputeDotProduct_ref
0.12% xhpcg [.] ComputeRestriction_ref
0.11% xhpcg [.] ComputeProlongation_ref
0.08% xhpcg [.] ComputeDotProduct_ref

The function ComputeDotProduct_ref is printed twice, once on line 4 and again on line 7 (last line).
I thoroughly checked source code and found that there is no function overloading for this function and it's defined only once.
Then why "perf top" is showing the same function twice ?

Thank you.

Last edited by MahendraL; 07-14-2015 at 11:24 PM.


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