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PROGRAM:
NAME
nvidia-persistenced - A daemon to maintain persistent software state in
the NVIDIA driver.
SYNOPSIS
nvidia-persistenced
DESCRIPTION
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.
OPTIONS
-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.
--nvidia-cfg-path=PATH
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.
NOTES
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: ⟨ftp://
download.nvidia.com/XFree86/nvidia-persistenced/⟩
EXAMPLES
nvidia-persistenced
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'.
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