I downloaded the oprofile package and installed it.
To use it, you have to have root privelages, so I created a bash script that I can run under `sudo`.
`#!/usr/bin/env bash
export ROS_DOMAIN_ID=8
export RMW_IMPLEMENTATION=rmw_coredx_cpp
source <ros2_base_install>/local_setup.bash
source <depth_to_pointcloud_install>/local_setup.bash
operf /absolute/path/to/depth_to_pointcloud_node`

`> sudo ./my_bash_script.bash` does the trick.
The reason I chose oprofile instead of gprof (or other) is that you can kill the process and it still collects info.

To generate the statistics you have to run:
`opreport --symbols`





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