TraceX shows x server protocall communication for a selected program. This is the low level comminication used by xlib and others. The data can be shown as raw hex io, or formatted into the individual functions. This program meets the SFF guidelines.
We provide a mechanism to trace the NPTL Library as few intrusive as possible for the application dynamics. The post-mortem analysis then allows measurements (contension,...) and understanding of hangs or bugs. No change in kernel or user application.