• 多进程
  • fork()
    • getpid()
    • getppid()
  • multiprocessing
    • Process
      • start()
      • join()
    • Pool
      • map()
      • imap_unordered()
      • apply_async()
      • close()
      • join()
    • (Exchange objects)
      • Queue
        • put()
        • get()
        • empty()
        • full()
        • qsize()
        • close()
        • join_thread()
        • cancel_join_thread()
        • Queues are thread and process safe.
        • doc of methods
      • Pipes
        • 双工可选的（duplex）
        • doc of methods
    • (Synchronization between processes)
      • Lock
    • (Sharing state between processes)
      • Value, Array
        • process and thread-safe
      • Manager
        • list, dict, Namespace, Lock, RLock, Semaphore, BoundedSemaphore, Condition, Event, Queue, Value and Array
    • managers
      • common
        • register()
      • server
        • start()
        • shutdown()
      • client
        • connect()
    • (miscellaneous)
      • active_children()
      • cpu_count()
      • current_process()
    • get_logger(), log_to_stderr()
    • Programming guidelines
  • 多个Python进程有各自独立的GIL锁，互不影响
• 多线程
  • thread
  • threading
    • Thread
      • start()
      • join()
    • current_thread()
    • Lock
      • acquire()
      • release()
    • ThreadLocal
  • 多线程编程，模型复杂，容易发生冲突，必须用锁加以隔离，同时，又要小心死锁的发生
• 架构
  • Master-Worker
  • 进程
  • 线程
    • 开销小
    • 稳定性低
    • 不能利用多核
    • 异步IO
  • 计算密集 vs IO密集