Two or more trace files from simultaneous sessions that were captured on the same machine can be merged into a single trace file. The following command merges two files named Kernel.etl and User.etl into one file, System.etl:
xperf -merge kernel.etl user.etl system.etl
The resulting trace file, System.etl, contains the trace information from both Kernel.etl and User.etl, as well as additional system information that is critical for symbol decoding.
Important An unmerged kernel trace cannot be symbol decoded correctly. For more information, see the Symbol Supportsection of this document.
Build date: 5/5/2012