# time_fadd.py3  try to measure time of double  A = A + B         
#                roughly time of one floating point add            
#                using double difference and minimum and stability 

import time
def do_count(count, A, B):
  return count+1

print("time_fadd.py3 running  using  time.process_time()")
now = time.process_time()
rep = 1000    # minimum of 32 typical 
outer = 100000  # some big number
print("rep=",rep,"  loop=",outer)
t_prev = 0.0
A = 0.0
B = 0.1
t1 = time.process_time()
for i in range(0,outer): # outer control loop 
  count_check = 0
  for j in range(0,rep):   # inner control loop 
    count_check = do_count(count_check, A, B)

  # end j  

# end i
t2 = time.process_time()
print("count_check=", count_check)

A = 0.0
t3 = time.process_time()
for i in range(0,outer): # outer measurement loop 
  count_check = 0
  for j in range(0,rep):   # inner measurement loop 
    count_check = do_count(count_check, A, B)
    A = A + B   # item being measured, approximately FADD time 

  # end j

# end i
t4 = time.process_time()
print("count_check=", count_check)

tmeas = (t4-t3) - (t2-t1) # the double difference 
print("time measured", tmeas)
fadd_time = tmeas/rep
fadd_time = fadd_time/outer
print("fadd_time=", fadd_time," seconds")
print((1.0/fadd_time)," fadd per second")
print(" ")
print("time_fadd.py3 finished")
# end time_fadd.py3