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  2. """
  3. homer pypy $ /tmp/download/pypy2-v5.7.1-linux64/bin/pypy benchstruct.py
  4. unpack str: 0.05 secs
  5. unpack bytearray: 0.24 secs
  6. unpack array: 0.34 secs
  7. unpack np.array: 2.52 secs
  8. plan pack: 2.56 secs
  9. pack_into bytearray: 0.36 secs
  10. homer pypy $ pypy benchstruct.py
  11. unpack str: 0.05 secs
  12. unpack bytearray: 0.16 secs
  13. unpack array: 0.18 secs
  14. unpack np.array: 0.23 secs
  15. plan pack: 2.12 secs
  16. pack_into bytearray: 0.06 secs
  17. """
  19. import struct
  20. import array
  21. import _numpypy.multiarray as np
  22. import time
  24. N = 10000000
  25. BUF_STR = [struct.pack('qq', 1, 2), struct.pack('qq', 3, 4)]
  26. BUF_BA = map(bytearray, BUF_STR)
  27. BUF_ARRAY = [array.array('b', buf) for buf in BUF_STR]
  28. BUF_NP = [np.array([1, 2]), np.array([3, 4])]
  31. def bench_unpack(title, LST):
  32. res = 0
  33. a = time.time()
  34. for i in range(N):
  35. buf = LST[i%2]
  36. val = struct.unpack('qq', buf)[0]
  37. res += val
  38. b = time.time()
  39. print '%20s: %.2f secs' % (title, b-a)
  40. return res
  42. def bench_pack():
  43. lst = [None]*N
  44. buf = struct.pack('q', 4)
  45. a = time.time()
  46. for i in range(N):
  47. buf = struct.pack('q', i)
  48. lst[i] = buf
  49. b = time.time()
  50. print '%20s: %.2f secs' % ('plan pack', b-a)
  53. def bench_pack_into():
  54. lst = [bytearray(8)]*N
  55. a = time.time()
  56. for i, buf in enumerate(lst):
  57. struct.pack_into('q', buf, 0, i)
  58. b = time.time()
  59. print '%20s: %.2f secs' % ('pack_into bytearray', b-a)
  61. def main():
  62. bench_unpack('unpack str', BUF_STR)
  63. bench_unpack('unpack bytearray', BUF_BA)
  64. bench_unpack('unpack array', BUF_ARRAY)
  65. bench_unpack('unpack np.array', BUF_NP)
  66. bench_pack()
  67. bench_pack_into()
  69. main()
  70.  
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