new_contents: #!/usr/bin/env python2
  
  import sys
  import subprocess
  
  """
  Usage:
      ./ref.py ./main -B 1000000 -t 3 -T 31
  """
  
  system = subprocess.check_output
  
  githash = system("git rev-parse HEAD", shell=True).strip()
  date = system("date -Ihours", shell=True).strip()
  
  filename = "reference.%s.%s" % (githash, date)
  
  benchargs = sys.argv[1:]
  
  with open(filename, "wb") as fh:
      fh.write(" ".join(benchargs) + "\n")
  
      system(benchargs) # warm up
      results = system(benchargs)
      fh.write(results)
  
  print "Wrote", filename
  
subject: Add simple perf measuring tool