Disable sleep in Linux
Semiphemeral runs directly on your computer. If you need to run it for hours or days (X has some annoying rate limits, so this is likely), you should prevent your computer from going to sleep while it's working.
Follow these instructions to temporarily prevent your computer from going to sleep in Ubuntu. (The steps should be similar for other Linux distributions too.)
First, make sure your computer is plugged in while running a Semiphemeral job.
Second, make sure your computer does not automatically go to sleep after being idle when plugged in:
- Open the Settings app
- Choose Power in the left panel
- Under Power Saving, click Automatic Suspend
- Make sure it's disabled under Plugged In
Now you can safely run Semiphemeral for an extended period of time without.
Note that your computer will still go to sleep if you close the laptop lid. So, don't close your laptop while you're doing a long-running Semiphemeral session.