系统监视器

系统监视器示例

输出：

  1. 75.0 frames per second
  1. import time
  2. import matplotlib.pyplot as plt
  3. import numpy as np
  6. def get_memory(t):
  7.     "Simulate a function that returns system memory"
  8.     return 100 * (0.5 + 0.5 * np.sin(0.5 * np.pi * t))
  11. def get_cpu(t):
  12.     "Simulate a function that returns cpu usage"
  13.     return 100 * (0.5 + 0.5 * np.sin(0.2 * np.pi * (t - 0.25)))
  16. def get_net(t):
  17.     "Simulate a function that returns network bandwidth"
  18.     return 100 * (0.5 + 0.5 * np.sin(0.7 * np.pi * (t - 0.1)))
  21. def get_stats(t):
  22.     return get_memory(t), get_cpu(t), get_net(t)
  24. fig, ax = plt.subplots()
  25. ind = np.arange(1, 4)
  27. # show the figure, but do not block
  28. plt.show(block=False)
  31. pm, pc, pn = plt.bar(ind, get_stats(0))
  32. pm.set_facecolor('r')
  33. pc.set_facecolor('g')
  34. pn.set_facecolor('b')
  35. ax.set_xticks(ind)
  36. ax.set_xticklabels(['Memory', 'CPU', 'Bandwidth'])
  37. ax.set_ylim([0, 100])
  38. ax.set_ylabel('Percent usage')
  39. ax.set_title('System Monitor')
  41. start = time.time()
  42. for i in range(200):  # run for a little while
  43.     m, c, n = get_stats(i / 10.0)
  45.     # update the animated artists
  46.     pm.set_height(m)
  47.     pc.set_height(c)
  48.     pn.set_height(n)
  50.     # ask the canvas to re-draw itself the next time it
  51.     # has a chance.
  52.     # For most of the GUI backends this adds an event to the queue
  53.     # of the GUI frameworks event loop.
  54.     fig.canvas.draw_idle()
  55.     try:
  56.         # make sure that the GUI framework has a chance to run its event loop
  57.         # and clear any GUI events.  This needs to be in a try/except block
  58.         # because the default implementation of this method is to raise
  59.         # NotImplementedError
  60.         fig.canvas.flush_events()
  61.     except NotImplementedError:
  62.         pass
  64. stop = time.time()
  65. print("{fps:.1f} frames per second".format(fps=200 / (stop - start)))

脚本的总运行时间：（0分钟2.678秒）

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