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System Performance Tuning

Run the provided script to optimize your system settings for real-time processing:

Terminal window
cd ~/OpenISAC
chmod +x scripts/set_performance.bash
./scripts/set_performance.bash

Note: secure_boot needs to be turned off in your BIOS settings to enable RT_RUNTIME_SHARE functionality.

When UHD spawns a new thread, it may try to boost the thread’s scheduling priority. If setting the new priority fails, the UHD software prints a warning to the console, as shown below.

[WARNING] [UHD] Failed to set desired affinity for thread

To address this issue, non-privileged (non-root) users need to be given special permission to change the scheduling priority. This can be enabled by creating a group usrp, adding your user to it, and then appending the line @usrp - rtprio 99 to the file /etc/security/limits.conf.

Terminal window
sudo groupadd usrp
sudo usermod -aG usrp $USER

Then add the line below to end of the file /etc/security/limits.conf:

@usrp - rtprio  99

You must log out and log back into the account for the settings to take effect. In most Linux distributions, a list of groups and group members can be found in the /etc/group file.