I want to compare performance of rtabmap on different systems which are of different configuration having different processors for our research work .
How can we find the time taken by rtabmap to generate any 2D map .
You can take a look on the Statistics panel view (Menu Window -> Show view... -> Statistics). The total time used by RTAB-Map can be found under "Timing->Total". For odometry (if you use rgbd_odometry or stereo_odometry), total time is shown under "Odometry->Time". You can show up a Plot of the timings by clicking the button next to any statistic. See Plot statistics page for examples. If you need to save the values of the Plot, you can right-click on the legend and select "Copy curve data to clipboard".