关于单线程写入文件测速
1. 文件总大小 69.8M
2. 文件内容格式如下:
66.249.69.131 - - [10/Aug/2016:03:20:09 +0800] "GET /robots.txt HTTP/1.1" 404 162 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
3. 生成如下格式:
[('66.249.69.131', '10/Aug/2016:03:20:09 +0800', 'GET /robots.txt HTTP/1.1', '404', '162', 'Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)')]
4. 正则:
matcher = re.compile(r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(.*)\] "(.*)" (\d+) (\d+) ".*" "(.*)"')
5.代码:
import re import datetime # matcher = re.compile(r'(?P<remote>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(?P<time>.*)\] "(?P<request>.*)" (?P<status>\d+) (?P<length>\d+) ".*" "(?P<ua>.*)"') matcher = re.compile(r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(.*)\] "(.*)" (\d+) (\d+) ".*" "(.*)"') fb = open('111','w+') def filenum(fb): start = datetime.datetime.now() with open('access.log') as f: for fobj in f: # fb.write(str(re.findall(matcher,fobj)) + '\n') # fb.writelines(str(re.findall(matcher,fobj)) + '\n') print(str(re.findall(matcher,fobj)),file=fb) end = datetime.datetime.now() return (end-start).total_seconds() public_time = filenum(fb) fb.close() print(public_time)
6. 测试结果(3 次测试结果):
a) . write : 平均用时 4.9s b) . writelines : 只测试了一次,用时41s 果断放弃 c) . print : 平均用时 5.22s
7. 总结:
从上面数据来说 write 优势要大于 print 和writelines。
上面只是个人临时测试结果,并不能代表通用性。 如果问题欢迎指出