Summing Basic Block Count Results From Multiple Runs

Use the following procedure to average prof results:

1. Compile and link the input file. Do not use the -p option. For example, consider the input file myprog.c:

   % cc -o myprog myprog.c

   The cc compiler compiles myprog.c and saves the executable as myprog.

2. Run the profiling program pixie, adding the -pids option, so that each run produces a distinct file.

   % pixie myprog -pids

   pixie generates the modified program myprog.pixie.

3. Run the profiled program as many times as desired. The instrumented program creates a myprog.Counts.pid file with each execution and appends the process ID.

   % myprog.pixie < input1 > output1

   % myprog.pixie < input2 > output2

   % myprog.pixie < input3 > output3

4. Create the report.

   % prof -pixie myprog myprog.Counts*

   prof sums the basic block data in the .Counts files to produce the profile report.