Provided by: nvidia-340_340.104-0ubuntu3_amd64 bug


       nvidia-persistenced - A daemon to maintain persistent software state in the NVIDIA driver.




       The nvidia-persistenced utility is used to enable persistent software state in the NVIDIA driver.  When persistence mode is enabled, the daemon prevents the driver from releasing device state when the device is not
       in use.  This can improve the startup time of new clients in this scenario.


       -v, --version
              Print the utility version and exit.

       -h, --help
              Print usage information for the command line options and exit.

       -V, --verbose
              Controls how much information is printed. By default, nvidia-persistenced will only print errors and warnings to syslog for unexpected events, as well as startup and shutdown notices.  Specifying  this  flag
              will cause nvidia-persistenced to also print notices to syslog on state transitions, such as when persistence mode is enabled or disabled, and informational messages on startup and exit.

       -u USERNAME, --user=USERNAME
              Runs  nvidia-persistenced  with the user permissions of the user specified by the USERNAME argument. This user must have write access to the /var/run/nvidia-persistenced directory. If this directory does not
              exist, nvidia-persistenced will attempt to create it prior to changing the process user and group IDs.

       --persistence-mode, --no-persistence-mode
              By default, nvidia-persistenced starts with persistence mode disabled for all devices. Use '--persistence-mode' to force persistence mode on for all devices on startup.

              The nvidia-cfg library is used to communicate with the NVIDIA kernel module to query and manage GPUs in the system. This library is required by  nvidia-persistenced.  This  option  tells  nvidia-persistenced
              where to look for this library (in case it cannot find it on its own). This option should normally not be needed.


       When  installed  by  nvidia-installer  ,  sample  init  scripts  to  start the daemon for some of the more prevalent init systems are installed as the compressed tarball /usr/share/doc/NVIDIA_GLX-1.0/sample/nvidia-
       persistenced-init.tar.bz2.  These init scripts should be customized to the user's distribution and installed in the proper location by the user to run nvidia-persistenced on system initialization.

       Once the init script is installed so that the daemon is running, users should not normally need to manually interact with nvidia-persistenced: the NVIDIA management utilities, such as  nvidia-smi,  can  communicate
       with it automatically as necessary to manage persistence mode.

       The  daemon  does  not  require  root privileges to run, and may safely be run as an unprivileged user, given that its runtime directory, /var/run/nvidia-persistenced, is created for and owned by that user prior to
       starting the daemon.  nvidia-persistenced also requires read and write access to the NVIDIA character device files.  If the permissions of the device files have been altered through any of the  NVreg_DeviceFileUID,
       NVreg_DeviceFile_GID, or NVreg_DeviceFileMode NVIDIA kernel module options, nvidia-persistenced will need to run as a suitable user.

       If  the  daemon  is  started  with root privileges, the --user option may be used instead to indicate that the daemon should drop its privileges and run as the specified user after setting up its runtime directory.
       Using this option may cause the daemon to be unable to remove the /var/run/nvidia-persistenced directory when it is killed, if the specified user does  not  have  write  permissions  to  /var/run.   In  this  case,
       directory removal should be handled by a post-execution script.  See the sample init scripts provided in /usr/share/doc/NVIDIA_GLX-1.0/sample/nvidia-persistenced-init.tar.bz2 for examples of this behavior.

       The  daemon  indirectly  utilizes nvidia-modprobe via the nvidia-cfg library to load the NVIDIA kernel module and create the NVIDIA character device files after the daemon has dropped its root privileges, if it had
       any to begin with.  If nvidia-modprobe is not installed, the daemon may not be able to start properly if it is not run with root privileges.

       The source code to nvidia-persistenced is available here: ⟨


              Starts the NVIDIA Persistence Daemon with persistence mode disabled for all NVIDIA devices.

       nvidia-persistenced --persistence-mode
              Starts the NVIDIA Persistence Daemon with persistence mode enabled for all NVIDIA devices.

       nvidia-persistenced --user=foo
              Starts the NVIDIA Persistence Daemon so that it will run as user 'foo'.


       Will Davis
       NVIDIA Corporation


       nvidia-smi(1), nvidia-modprobe(1)


       Copyright © 2013 NVIDIA Corporation.