Transparent Checkpointing for Applications with Graphical User Interfaces and Thread Support on Linux Systems

We address several common problems with transparent checkpointing and present solutions to these problems, with focus on graphical user interfaces and thread support. We describe two possible ways to retrieve the GUI state from the X-server, by using a proxy for the X-protocol and enhancing the X-server with an extension, and we present a performance analysis showing that the proposed approach does not imply an overly big performance impact. We also address checkpointing of threaded applications by mapping of process IDs (PID) between the application and the Linux kernel