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To enable persistent mode permanently on NVIDIA GPUs so that it persists across reboots, you can use one of the following methods:

You can create a custom systemd service that runs the nvidia-smi -pm 1 command at boot. This is a robust way to ensure that the setting is applied consistently every time the system starts. Here’s how you can do it:

1. Create a systemd service file: Open a terminal and use a text editor to create a new service file under /etc/systemd/system/. For instance, you might call the file nvidia-persistent-mode.service.

   sudo nano /etc/systemd/system/nvidia-persistent-mode.service

2. Add the following content to the file:

   [Unit]
   Description=Enable NVIDIA GPU Persistent Mode
   After=syslog.target
   
   [Service]
   Type=oneshot
   ExecStart=/usr/bin/nvidia-smi -pm 1
   
   [Install]
   WantedBy=multi-user.target

3. Reload systemd to recognize the new service:

   sudo systemctl daemon-reload

4. Enable the service so it starts at boot:

   sudo systemctl enable nvidia-persistent-mode.service

5. Start the service immediately to apply the change without rebooting:

   sudo systemctl start nvidia-persistent-mode.service

Alternatively, you can use cron to run

the nvidia-smi -pm 1 command at reboot. This method involves editing the crontab to add a reboot job.

1. Open the crontab for editing:

   sudo crontab -e

2. Add the following line to the end of the crontab file:

   @reboot /usr/bin/nvidia-smi -pm 1

3. Save and close the file. The cron job will now execute the nvidia-smi -pm 1 command every time the system boots up.

For systems that still support rc.local for startup scripts, you can add the nvidia-smi -pm 1 command to the rc.local file, which is executed at the end of the multi-user runlevel.

1. Edit the rc.local file:

   sudo nano /etc/rc.local

2. Add the following line before the exit 0 line:

   /usr/bin/nvidia-smi -pm 1

3. Make sure that rc.local is executable:

   sudo chmod +x /etc/rc.local

4. Enable the rc-local service if it is not already enabled (systemd systems):

   sudo systemctl enable rc-local

• Systemd Service: This is the most robust and recommended method for modern Linux systems that use systemd.
• Cron Job: This is a simple and effective method that works across various types of systems but is generally less preferred than using systemd.
• RC Local: This is a legacy method and should only be used if you are on an older system that does not support systemd.

Using any of these methods, you can ensure that NVIDIA's persistent mode is enabled automatically every time your system boots, reducing GPU initialization time for your applications.