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Python3 线程 & GIL 学习笔记 by oflyhigh

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cn · @oflyhigh ·
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Python3 线程 & GIL 学习笔记
作为Python的初学者，基本上是遇到啥需求，就现去学习，能解决问题就可以。

比如前段时间，做的一个小程序，需要并发处理一些操作，所以就想到了使用线程的概念。

![](https://steemitimages.com/DQmd49dm5bKty2sUUE8hHpiAYFhBiTMjerpSbBojdJdWYGK/image.png)

# _thread 模块

上网学习了一下
https://docs.python.org/3/library/_thread.html
`_thread.start_new_thread(function, args[, kwargs])`
这个貌似很简单

因为我的程序把线程启动起来就可以，然后就自己做自己的事情，做完就退出，对全局的东西不需要进行改变，所以也用不到线程锁之类的概念。


我用这个模块实现了我的程序，良好地运行了很长一段时间，完全符合我的要求。

 # threading 模块

前些天有个新任务，同样需要用到线程。不同的是，我程序中需要用到当前在执行的线程数量，当数量超过我定义的限制，就暂停启动新线程，直到其它线程有结束的，当前线程数量下降。

我想到的方法设置一个全局变量： 线程启动，变量加一； 线程退出，变量减一。
为了防止几个线程同时读写的情况，需要在对变量操作的时候加锁，操作完成释放。
然后我主线程中访问这个变量，判断当前运行中线程的数量
听起来似乎可行，然后我边去学习怎么加锁和释放

然后，我才发现我用_thread被叫做低级( low-level)模块, 而高级(higher-level)模块threading直接提供了
`threading.active_count()`
https://docs.python.org/3/library/threading.html

既然有了高级模块，咱就别自己造轮子啦。
然后就要去研究一下这个threading 模块咋用啦，结果发现还整出两种使用方法：

##### 方法一：
`threading.Thread(group=None, target=None, name=None, args=(), kwargs={}, *, daemon=None)`
方法一的方式和`_thread.start_new_thread`比较类似。

##### 方法二：
从Thread继承，并重写run()方法


我选择方法二的方式实现我的程序
`class myThread (threading.Thread):`
在 `__init__`中传入要处理的参数
在`run`做我要做的处理

在程序中这样启动线程：
`thread = myThread(arg_a, arg_b, arg_c)`
`thread.start()`

在程序中使用： `threading.active_count()`判断数量


程序运行了几天，最多时候几十个线程再跑，工作状况良好，完全达到预期。

# GIL 

在了解和学习Python多线程过程中，看到不少对Python多线程的争议。尤其是在多CPU和多核处理器环境下，没法充分利用CPU资源，确切地说，只能可一个CPU霍霍。

究其原因，是因为Python原始解释器CPython中使用了***GIL (Global Interpreter Lock，全局解释器锁)***来限制线程对共享资源的访问，同一时间只会有一个获得GIL的线程在跑，其他线程则处于等待状态。与其说是多线程，更像是时间片调度，当然了，具体调度方法肯定是更复杂和更科学的。

因为这个GIL的存在，Python多线程，没法真正的并行处理，而是并发处理。对于CPU密集型任务，如果使用多线程，因为GIL的存在导致除了不能利用多核多CPU的优势，反而要浪费时间在线程间切来切去，效率会变得低下。而对于IO密集型任务，因为IO浪费的时间比较多，所以使用多线程是会提升效率的。

看了下我的程序，嗯，还好，都是网络访问的，至少用多线程实现起来很方便，事实也证明很好用。

至于Python下怎么利用多核或者多CPU，据说是使用多进程。
但是我暂时没有这种需要，毕竟，我的原则是，好用就行，折腾啥呀。

另外，关于并发处理，还有可以参考这里：
https://docs.python.org/3/library/asyncio.html
看起来挺高大上的，不明觉厉。

有关GIL可以参考：
https://wiki.python.org/moin/GlobalInterpreterLock

就这样啦，代码啥的就不贴出来充数了。
网上示例一大堆，大家感兴趣的自己去看看好了。


# 参考资料：

* https://docs.python.org/3/library/_thread.html
* https://docs.python.org/3/library/threading.html
* https://wiki.python.org/moin/GlobalInterpreterLock
* https://docs.python.org/3/library/asyncio.html
* http://www.wellho.net/solutions/python-python-threads-a-first-example.html
* https://www.tutorialspoint.com/python/python_multithreading.htm
* https://stackoverflow.com/questions/2846653/how-to-use-threading-in-python
* http://www.python-course.eu/threads.php
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@abdelhadi ·
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@akilie1029 · 
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次次次
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@jubi · 
py安装了2个星期了。
**启动次数：2**
安装时启动1次，阅读完该文启动1次
👍  
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@oflyhigh · 
适合自己的就是最好的
有必要十八般武器样样精通吗？😀

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我是没啥擅长的，看Python易上手，就拿来学学
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@kitcat · 
upvoted resteemed and followed
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@kresho1 · 
Python is in top 3. programming languages in world. Love programming with Python. :)
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@lifeisfun · 
Thats a great Articles...but if anybody has answer to the following question it will be great help..

https://steemit.com/facebook/@lifeisfun/question-making-money-with-no-of-likes-on-facebook-for-steemit-posts
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@lydiachan · 
以前曾有一堂課有上過一些些程式語言, 結果那堂課果不其然的得重學.... XDD
曾經聽說過以前朋友在學B、C語言的,聽說那些程式語言都是他們的噩夢啊...
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@mamamyanmar · 
like
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@muhajirnyakcut ·
$0.76
I do not understand your language,
But I know what python is
👍  
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vote details (1)
@powerfj ·
$2.64
Python的线程好像是有点蛋疼, 如果是CPU密集型的任务, 应该直接进程就好了, 大部分时候是跑满CPU核数, 如果是IO密集型的, 目前大部分都用Event Loop模型了
👍  , , ,
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vote details (4)
@mmansooramin · 
follow for free coupons

https://steemit.com/@mmansooramin
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@oflyhigh · 
感谢分享
慢慢摸索中
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@sharoon · 
very nice post  even i don,t know Chines
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@siddm96 · 
Python is awesome.
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@steemboad · (edited)
좋은 게시물. 우리가 인도 할 수 있을까요? 고마워.
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@steemian69 · 
I Never Really Liked Python But One Thing I Like About It Is Not Having Any ";" Lol If You Know What I Mean :)
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@stefanarnaut · 
Python is the best programming language
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@syahrul · 
@oflyhigh Good article, very weighty to be reviewed.
Information is very important for the lovers pemograman.
👍  
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vote details (1)
@yooraa ·
$0.99
Great posts can be useful can be an experience. Hopefully be a friend who can help me to like you ..... to dream and hope to be achieved. Like @yooraa need friend support. Best regards.
👍  ,
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