Hi all,<br>��� I make up a learning examples but cannot explain the result:<br>��� In the following codes, everything inside the stage[1] is between PetscLogEventBegin() and PetscLogEventEnd(), so I expect the time of the EVENT_MGSolver should take up 100% percent of the time in this stage. But log_summary only gives me 97%. Where is the 3%?� <br>
�<br>��� PetscLogStagePush(stages[1]);<br>��� PetscLogEventBegin(MGSolver,0,0,0,0);<br>�� � � for(l=0;l<100;l++){�� <br>���������� ///// some functions calls<br>��� �}<br>���� PetscLogEventEnd(MGSolver,0,0,0,0);<br>���� PetscLogStagePop();<br>
<br>-log_summary:<br>--- Event Stage 2:<br><br>MatMult���������� 241600 1.0 3.4837e+01 1.0 1.06e+10 1.0 0.0e+00 0.0e+00 0.0e+00 64 75� 0� 0� 0� 65 75� 0� 0� 0�� 303<br>MatMultAdd�������� 53200 1.0 2.9537e+00 1.0 6.91e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 5� 5� 0� 0� 0�� 6� 5� 0� 0� 0�� 234<br>
MatSolve���������� 35200 1.0 6.0787e-02 1.0 3.01e+06 1.0 0.0e+00 0.0e+00 0.0e+00� 0� 0� 0� 0� 0�� 0� 0� 0� 0� 0��� 50<br>VecDot����������� 272000 1.0 1.6983e+00 1.0 7.64e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 3� 5� 0� 0� 0�� 3� 5� 0� 0� 0�� 450<br>
VecNorm����������� 35200 1.0 4.8882e-02 1.0 5.28e+05 1.0 0.0e+00 0.0e+00 0.0e+00� 0� 0� 0� 0� 0�� 0� 0� 0� 0� 0��� 11<br>VecScale��������� 117600 1.0 6.2790e-01 1.0 2.62e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 1� 2� 0� 0� 0�� 1� 2� 0� 0� 0�� 417<br>
VecCopy���������� 141600 1.0 1.4639e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00� 3� 0� 0� 0� 0�� 3� 0� 0� 0� 0���� 0<br>VecSet������������ 35200 1.0 3.4475e-02 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00� 0� 0� 0� 0� 0�� 0� 0� 0� 0� 0���� 0<br>
VecAXPY����������� 35200 1.0 3.4980e-02 1.0 5.63e+05 1.0 0.0e+00 0.0e+00 0.0e+00� 0� 0� 0� 0� 0�� 0� 0� 0� 0� 0��� 16<br>VecAYPX���������� 288400 1.0 3.4488e+00 1.0 8.93e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 6� 6� 0� 0� 0�� 6� 6� 0� 0� 0�� 259<br>
VecWAXPY��������� 100800 1.0 1.3907e+00 1.0 3.81e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 3� 3� 0� 0� 0�� 3� 3� 0� 0� 0�� 274<br>VecPointwiseMult� 320000 1.0 4.8273e+00 1.0 5.72e+08 1.0 0.0e+00 0.0e+00 0.0e+00� 9� 4� 0� 0� 0�� 9� 4� 0� 0� 0�� 119<br>
KSPSolve���������� 17600 1.0 5.6411e-01 1.0 6.14e+06 1.0 0.0e+00 0.0e+00 0.0e+00� 1� 0� 0� 0� 0�� 1� 0� 0� 0� 0��� 11<br>PCApply����������� 35200 1.0 1.2111e-01 1.0 3.01e+06 1.0 0.0e+00 0.0e+00 0.0e+00� 0� 0� 0� 0� 0�� 0� 0� 0� 0� 0��� 25<br>
MGSolver�������������� 1 1.0 5.3215e+01 1.0 1.41e+10 1.0 0.0e+00 0.0e+00 0.0e+00 97100� 0� 0� 0 100100� 0� 0� 0�� 265<br>-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br>
Moreover, <br>What are the last four parameters of� PetscLogEventBegin() used for? The manually vaguely states that "objects associated with the event". <br>The provided examples set them to zeros. In what situation should we pass a non-zero? <br>
�I can obtain profiling information with -log_summary but I get nothing with -log or -log_all. Did I miss any steps for -log/-log_all to work?<br>Thanks. <br><br>�<br>