You can use the command top to show the processes running. However, I'm not sure how to show the threads, let me investigate about it to see if I can find any useful command for this purpose.
I found the following command that might be helpful for you:
lsof -p <PID>
Additional information about this command can be found in the following site: lsof(8): open files - Linux man page
Another alternative is installing the package htop. The package can be installed from the AlexT's repo. If you already have the Edison configured to fetch from this repo, then you just need to run the following command:
If you don't have the Edison configured, follow the steps shown in the following site: Edison Package Repo Configuration Instructions.
Additional details about the htop command can be found in the following site: htop(1): interactive process viewer - Linux man page
Thanks a lot.
Tomorrow i'll try. I hope htop doesn't makes system unstable.