Unfinished/infinite calculation on cartographer sample data cartographer_paper_deutsches_museum.bag

[Pavol89]

I want to ask about a problem with the sample calculation of the 2D demo you have on the site. The count starts well. Rviz draws the map, and everything looks OK. However, the analysis did not finish even after 3 hours; it was without an error in the terminal. The only mistake I see is directly in Rviz's Trajectory and Constraints. However, these errors have been there since the beginning, and I found in the issues that it does not affect the calculation. I tried the calculation twice, but the result is the same. I'm not an expert on ROS, so I want to ask:

1. How do I find the end of the calculation in Rviz? How much should the calculation take, depending on the hardware described below? I assume that something should be displayed in the terminal.
2. How can I fix the problem? I work on a laptop (Intel Core i7 8850H @ 2.60GHz, 64GB RAM) I have ROS Noetic installed in Ubuntu 20.04. I also used the command before running. source install_isolated/setup.bash

Here are the errors that are displayed in Rviz: Trajectories At least two points are required for a LINE_STRIP marker.

Constraints Inter constraints, different trajectories/4 Points should not be empty for specified marker type. Marker is fully transparent (color.a is 0.0). Apart from these errors, I didn't find any other error in the terminal or anywhere else. Thanks in advance for any advice.