Hongwei, 03/18/19
To check my profiling results, do the following on L409

1. source /opt/intel_17/parallel_studio_xe_2017/psxevars.csh
2. amplxe-gui &
3. Open or import my profiling results at

/star/u/kehw/intel/amplxe/projects/hlt-bfc/r006hsxs

How to run
================================================================================
Callgrind: a call-graph generating cache and branch prediction profiler

https://valgrind.org/docs/manual/cl-manual.html#cl-manual.functionality

1. callgrind_annotate : This command reads in the profile data, and prints a sorted lists of functions, optionally with source annotation.
2. callgrind_control  :  This command enables you to interactively observe and control the status of a program currently running under Callgrind's control

Basic Usage:
-----------
valgrind --tool=callgrind [callgrind options] your-program [program options]

To observe execution with: callgrind_control -b  
To annotate the backtrace with event counts, run : callgrind_control -e -b

After program termination, a profile data file named callgrind.out.<pid> is generated,

To generate a function-by-function summary from the profile data file, use : callgrind_annotate [options] callgrind.out.<pid>