Performance monitoring through intel VTune amplifier

Saumya_B_ · ‎09-13-2016

Hie all,

I am new to VTune. I wanted to analyze program on intel xeon-phi coprocessor, for which I executed the following command:

amplxe-cl -collect-with runsa -knob event config=CPU_CLK_UNHALTED.THREAD,INST_RETIRED.ANY,MEM_LOAD_UOPS_RETIRED.L1_HIT,MEM_LOAD_UOPS_RETIRED.L2_HIT,MEM_LOAD_UOPS_RETIRED.L1_MISS,MEM_LOAD_UOPS_RETIRED.L2_MISS,MEM_UOPS_RETIRED.ALL_LOADS,MEM_UOPS_RETIRED.ALL_STORES,MOVE_ELIMINATION.SIMD_ELIMINATED,CYCLE_ACTIVITY.CYCLES_L1D_PENDING,L2_RQSTS.L2_PF_MISS,L2_RQSTS.L2_PF_HIT -- ssh mic0 "export OMP_NUM_THREADS=8; ./a.out"

But I get the following results :

INST_RETIRED.ANY                                    60000090                                30               2000003
CPU_CLK_UNHALTED.THREAD                             40000060                  20               2000003
CPU_CLK_UNHALTED.REF_TSC                            40000060                 20               2000003
CYCLE_ACTIVITY.CYCLES_L1D_PENDING                          0                   0               2000003
MEM_LOAD_UOPS_RETIRED.L1_HIT                               0                        0               2000003
MEM_LOAD_UOPS_RETIRED.L2_HIT                               0                        0               100003
MEM_LOAD_UOPS_RETIRED.L1_MISS                              0                      0               100003
MEM_LOAD_UOPS_RETIRED.L2_MISS                              0                      0               50021
MEM_UOPS_RETIRED.ALL_LOADS                          42000063                 7               2000003
MEM_UOPS_RETIRED.ALL_STORES                         18000027               3              2000003
MOVE_ELIMINATION.SIMD_ELIMINATED                           0                      0             1000003
L2_RQSTS.L2_PF_MISS                                        0                                       0             200003
L2_RQSTS.L2_PF_HIT                                         0                                          0            200003

Any reason why so many values are zero?

Dmitry_R_Intel1 · ‎09-15-2016

You can't profile application on MIC in such way. Your command actually profiled the ssh process running on the host which did almost nothing except i/o. Thus very small or zero event counts.

Please use '-target-system mic-host-launch:mic0' option, e.g.:

amplxe-cl -target-system mic-host-launch:mic0 -collect-with runsa -knob event-config=CPU_CLK_UNHALTED:sa=2000000,INSTRUCTIONS_EXECUTED:sa=2000000 -- a.out

More info on this in VTune OLH:

https://software.intel.com/en-us/node/596763

https://software.intel.com/en-us/node/596531

Saumya_B_ · ‎09-15-2016

Thanks a lot