Traceview File Format
Tracing creates two distinct pieces of output: a data file,
which holds the trace data, and a key file, which
provides a mapping from binary identifiers to thread and method names.
The files are concatenated when tracing completes, into a
single .trace file.
Note: The previous version of Traceview did not concatenate
these files for you. If you have old key and data files that you'd still like to trace, you
can concatenate them yourself with
cat mytrace.key mytrace.data > mytrace.trace.