Troubleshooting Guide

MPS Server Not Accepting New Client Requests

This error indicates that the MPS (Multi-Process Service) server is currently unable to accept new client connections. This is typically a temporary condition caused by one of the following reasons.

Possible Causes and Recommended Actions Server Recovery or Automatic Restart

Cause: The MPS server is recovering from a previous error or automatically restarting due to a kernel-level application failure.

Action: Wait for the server to complete its recovery. If these errors occur repeatedly, investigate the client application for underlying issues.

Server Initialization in Progress

Cause: The server is performing initialization operations equivalent to cuInit() --> cuCtxCreate(). On systems with multiple GPUs and no persistence daemon, this can take a significant amount of time. Any client connections attempted during this period will receive this error.

Action: Allow the initialization to complete. To speed up future startups, consider enabling the NVIDIA Persistence Daemon.

Client Termination Cleanup

Cause: A terminate_client operation is in progress. During this time, the server restricts new connections to clean up resources from a specific client.

Action: Wait for the cleanup process to finish. This does not affect other connected clients.

User ID Mismatch Without Multi-User Mode

Cause: A client with a different user ID is attempting to connect while the server is not started with the -multiuser-server flag.

Action: Either start the MPS server with the -multiuser-server option or ensure that clients are using the same user ID. The default MPS behavior is to restart the server for each unique user ID.