I tried to make a bi-obj optimization start from the previous state when the process was interrupted instead of starting from the beginning. Following the tutorial, I added the following to the parameter input file:

CACHE_FILE cache.txt
HOT_RESTART_ON_USER_INTERRUPT true
HOT_RESTART_READ_FILES true
HOT_RESTART_WRITE_FILES true
HOT_RESTART_FILE hotrestart.txt

But DMULTIMADS couldn't restart from the previous iteration when I killed the optimization. Similarly, when I ran bi-obj again without changing my param.txt, it made another MAX_BB_EVAL black box runs instead of being stopped at the beginning due to reaching max bb runs. For a single obj, the parameters above can make NOMAD read the hot restart file first. The example problems I tested were taken from nomad/examples/basic/batch/multi_obj/param.txt and /basic/batch/examples1/param.txt.

Thank you for your help!