time_exc.pyx

# Drop this in the Demos directory of Cython and run
# python setup.py build_ext --inplace && python -c 'import time_exc'

# cython: cdivision=True
# distutils: extra_compile_args = -O3


import time

cdef int with_nothing(bint bad):
  if bad:
    try:
      raise ValueError()
    except:
      pass

cdef int with_star(bint bad) except *:
  if bad:
    raise ValueError()

cdef int with_value(bint bad) except -0xBadBad:
  if bad:
    raise ValueError()

cdef int with_maybe_value(bint bad) except? -0xBadBad:
  if bad:
    raise ValueError()


def time_with_nothing(long N, bint any_bad):
    cdef int k
    if any_bad:
        for k in range(N):
            try:
                with_nothing(k % 2)
            except:
                pass
    else:
        for k in range(N):
            with_nothing(False)

def time_with_star(long N, bint any_bad):
    cdef int k
    if any_bad:
        for k in range(N):
            try:
                with_star(k % 2)
            except:
                pass
    else:
        for k in range(N):
            with_star(False)

def time_with_value(long N, bint any_bad):
    cdef int k
    if any_bad:
        for k in range(N):
            try:
                with_value(k % 2)
            except:
                pass
    else:
        for k in range(N):
            with_value(False)

def time_with_maybe_value(long N, bint any_bad):
    cdef int k
    if any_bad:
        for k in range(N):
            try:
                with_maybe_value(k % 2)
            except:
                pass
    else:
        for k in range(N):
            with_maybe_value(False)

#TODO: Use timeit
def time_all(base, any_bad):
  fs = [time_with_nothing, time_with_star, time_with_value, time_with_maybe_value]
  for ix, f in enumerate(fs * 4):
    if ix % len(fs) == 0:
      print
    t = time.time()
    N = base * (ix // len(fs) + 1)
    f(N, any_bad)
    elapsed = time.time() - t
    print f.__name__, ' \t', elapsed, ' \t', elapsed / N

time_all(1000000, True)
print
time_all(100000000, False)
print
print "DONE"