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nvidia-cuda-mps-control - NVIDIA CUDA Multi Process Service management


nvidia-cuda-mps-control [-d]


MPS is a runtime service designed to let multiple MPI processes using
CUDA to run concurrently on a single GPU in a way that's transparent to
the MPI program. A CUDA program runs in MPS mode if the MPS control
daemon is running on the system.

When CUDA is first initialized in a program, the CUDA driver attempts
to connect to the MPS control daemon. If the connection attempt fails,
the program continues to run as it normally would without MPS. If
however, the connection attempt to the control daemon succeeds, the
CUDA driver then requests the daemon to start an MPS server on its
behalf. If there's an MPS server already running, and the user id of
that server process matches that of the requesting client process, the
control daemon simply notifies the client process of it, which then
proceeds to connect to the server. If there's no MPS server already
running on the system, the control daemon launches an MPS server with
the same user id (UID) as that of the requesting client process. If
there's an MPS server already running, but with a different user id
than that of the client process, the control daemon requests the
existing server to shutdown as soon as all its clients are done. Once
the existing server has terminated, the control daemon launches a new
server with the user id same as that of the queued client process.

The MPS server creates the shared GPU context, manages its clients, and
issues work to the GPU on behalf of its clients. An MPS server can
support upto 16 client CUDA contexts at a time. MPS is transparent to
CUDA programs, with all the complexity of communication between the
client process, the server and the control daemon hidden within the
driver binaries.

Currently, CUDA MPS is available on 64-bit Linux only, requires a
device that supports Unified Virtual Address (UVA) and has compute
capability SM 3.5 or higher. Applications requiring pre-CUDA 4.0 APIs
are not supported under CUDA MPS. MPS is also not supported on multi-
GPU configurations. Please use CUDA_VISIBLE_DEVICES when starting the
control daemon to limit visibility to a single device.


Start the MPS control daemon, assuming the user has enough privilege
(e.g. root).

-h, --help
Print a help message.

<no arguments>
Start the front-end management user interface to the MPS control
daemon, which needs to be started first. The front-end UI keeps reading
commands from stdin until EOF. Commands are separated by the newline
character. If an invalid command is issued and rejected, an error
message will be printed to stdout. The exit status of the front-end UI
is zero if communication with the daemon is successful. A non-zero
value is returned if the daemon is not found or connection to the
daemon is broken unexpectedly. See the "quit" command below for more
information about the exit status.

Commands supported by the MPS control daemon:

Print out a list of PIDs of all MPS servers.

start_server -uid UID
Start a new MPS server for the specified user (UID).

shutdown_server PID [-f]
Shutdown the MPS server with given PID. The MPS server will not
accept any new client connections and it exits when all current
clients disconnect. -f is forced immediate shutdown. If a client
launches a faulty kernel that runs forever, a forced shutdown of
the MPS server may be required, since the MPS server creates and
issues GPU work on behalf of its clients.

get_client_list PID
Print out a list of PIDs of all clients connected to the MPS
server with given PID.

quit [-t TIMEOUT]
Shutdown the MPS control daemon process and all MPS servers. The
MPS control daemon stops accepting new clients while waiting for
current MPS servers and MPS clients to finish. If TIMEOUT is
specified (in seconds), the daemon will force MPS servers to
shutdown if they are still running after TIMEOUT seconds.

This command is synchronous. The front-end UI waits for the
daemon to shutdown, then returns the daemon's exit status. The
exit status is zero iff all MPS servers have exited gracefully.


Specify the directory that contains the named pipes used for
communication among MPS control, MPS server, and MPS clients.
The value of this environment variable should be consistent in
the MPS control daemon and all MPS client processes. Default
directory is /tmp/nvidia-mps

Specify the directory that contains the MPS log files. This
variable is used by the MPS control daemon only. Default
directory is /var/log/nvidia-mps

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