old_contents: #!/usr/bin/python
  #
  #  Small helper for perftest runs.
  #
  
  import os
  import sys
  import subprocess
  
  def main():
  	count = int(sys.argv[1])
  
  	time_min = None
  	for i in xrange(count):
  		cmd = [
  			'time',
  			'-f', '%U',
  			'--quiet',
  			sys.argv[2],   # cmd
  			sys.argv[3]    # testcase
  		]
  		#print(repr(cmd))
  		p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  		stdout, stderr = p.communicate()
  		retval = p.wait()
  		#print(i, retval, stdout, stderr)
  
  		if retval != 0:
  			print 'n/a'
  			return
  
  		time = float(stderr)
  		#print(i, time)
  
  		if time_min is None:
  			time_min = time
  		else:
  			time_min = min(time_min, time)
  
  	# /usr/bin/time has only two digits of resolution
  	print('%.02f' % time_min)
  
  if __name__ == '__main__':
  	main()
  
new_contents: #!/usr/bin/python
  #
  #  Small helper for perftest runs.
  #
  
  import os
  import sys
  import subprocess
  
  def main():
  	count = int(sys.argv[1])
  
  	time_min = None
  	for i in xrange(count):
  		cmd = [
  			'time',
  			'-f', '%U',
  			'--quiet',
  			sys.argv[2],   # cmd
  			sys.argv[3]    # testcase
  		]
  		#print(repr(cmd))
  		p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  		stdout, stderr = p.communicate()
  		retval = p.wait()
  		#print(i, retval, stdout, stderr)
  
  		if retval == 139:
  			print 'segv'
  			sys.exit(1)
  		elif retval != 0:
  			print 'n/a'
  			sys.exit(1)
  
  		time = float(stderr)
  		#print(i, time)
  
  		if time_min is None:
  			time_min = time
  		else:
  			time_min = min(time_min, time)
  
  	# /usr/bin/time has only two digits of resolution
  	print('%.02f' % time_min)
  	sys.exit(0)
  
  if __name__ == '__main__':
  	main()
  
subject: Add exitcode and segv check for timing util