Generating Mapfiles and Function Reordering

In addition to analyzing the data, the Analyzer also provides a function-reordering capability. Based on the data in an experiment, the Analyzer can generate a mapfile which, when used with the static linker (ld) to relink the application, creates an executable with a smaller working set size, or better I-cache behavior, or both.

The order of the functions that is recorded in the mapfile and used to reorder the functions in the executable is determined by the metric that is used for sorting the function list. Exclusive User CPU time or Exclusive CPU Cycle time are normally used for producing a mapfile. Some metrics, such as those from synchronization delay or heap tracing, or name or address do not produce meaningful ordering for a mapfile.