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程序执行方式 python main.py -h python main.py -u www.sohu.com -d 2 执行平台 Mac python2.7.2 Linux python 2.6 执行情况（两个情景不同网络情况） mac thread num 20 8 links/s 内存 1.5G sumo.com 2级 深度 171s thread num 10 5-7 links/s 内存 1.6G www.baidu.com 3级深度共耗时443.149364948 秒 程序依赖包 beautifulsoup4 requests pysqlite==2.6.3 待解决问题 1）性能问题，占用内存过多，有些数据不应该存储在内存中 2）某些网络环境下，不能并发执行抓取任务－－具体问题待查 3) 数据库文件较大
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