These can be executed using the command:
tdmctl -s <server_name> exec dmdebug dumpThreads -output=<file_name>s
The output of threads is shown in Global Manager threads information example.
Global Manager threads information example lists running threads in the server. This gives an idea of the type of processing done in the server. This is often used in conjunction with a pstack output. This information is not typically monitored, but often used in investigating issues.