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这是一个创建于 3331 天前的主题，其中的信息可能已经有所发展或是发生改变。
tail -F 的源码是采用 inotify + select 方式来实现
python 的 pyinotify 库对 inotify 进行了封装，但貌似性能不是很好。
实现 tail-F: https://github.com/masterzh01/tail-F
 | 1 necomancer 2016-09-03 02:24:50 +08:00 from sys import argv import collections o = open(argv[1], 'r') print(''.join(collections.deque(o, 5)).strip('\n')) # last 5 lines o.seek(0,2) # jump to last line while 1: ....line = o.readline() ....if line: ........print(line.strip('\n')) 就可以了吧…… |
 | 2 masterzh01 OP @necomancer 不行， cpu ， rotate.....（ tail -F ） |
 | 3 hasdream 2016-09-03 10:09:33 +08:00 ``` import time import time def follow(thefile): thefile.seek(0,2) # Go to the end of the file while True: line = thefile.readline() if not line: time.sleep(0.1) # Sleep briefly continue yield line # Example use if __name__ == '__main__': logfile = open("access-log") for line in follow(logfile): print line, ``` |
| 4 necomancer 2016-09-03 13:20:33 +08:00 @masterzh01 CPU usage 问题加上 sleep 就行： from sys import argv import collections import time o = open(argv[1], 'r') print(''.join(collections.deque(o, 5)).strip('\n')) # last 5 lines o.seek(0,2) # jump to last line while 1: ....line = o.readline() ....if not line: ........time.sleep(0.1) ........continue ....print(line.strip('\n')) |
| 5 masterzh01 OP @hasdream @necomancer 事件驱动方式会更好些？ |
| 6 hasdream 2016-09-03 23:55:27 +08:00 via Android @masterzh01 如果用事件来做基本没延迟 不过要复杂点还要对事件处理 |
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