Running Simulations with Screen#

This guide explains how to run a Python-based simulation using a conda environment inside a detached screen session on a remote terminal.

Step-by-Step Instructions#

Start a Named Screen Session

Create a new screen session with a custom name:
```
screen -S mysession_simulation
```
Activate Your Conda Environment

Once inside the screen session, activate the environment:
```
conda activate my-conda-env
```
Run Your Simulation Script

Start your Python simulation:
```
python myscript.py
```
Detach from the Screen Session

To leave the session running in the background:
- Press: Ctrl + a, then d
You will return to the main terminal while the script continues running.

List All Screen Sessions
```
screen -ls
```
Reattach to a Running Session

If only one screen is active:
```
screen -r
```
If multiple sessions exist, reattach using the session name or ID:
```
screen -r mysession_simulation
screen -r 1234567.mysession_simulation
```
To forcibly detach it from another terminal and reattach:
```
screen -D -r mysession_simulation
```
Terminate a Screen Session Remotely

From outside the session:
```
screen -S 1234567.mysession_simulation -X quit
```
Or from inside the session:
```
exit
```
Exit the Terminal Session

Once everything is done:
```
exit
```

Screen sessions are persistent; you can disconnect from the remote server and reattach later without interrupting your simulation.
Always use meaningful names for screen sessions to stay organized during multiple simulation runs.