了解Maclean Liu|向Maclean Liu提问 Oracle ALLSTARS 全明星(群内有多位Oracle高级售后support，N位OCM和ACE) QQ群 # QQ群号:23549328 # 已经升级到 2000人群，空位多多。欢迎有一定基础的Oracle骨友加入，现在入群需要经过Maclean的技术面试，欢迎面试，请加QQ号:47079569 为好友参加面试 2群基础群 适合刚入门的同学，会共享最佳入门实践和资料 QQ群 # QQ群号:171092051 # 已经升级到 500人的超级群，空位多多，无需面试

一些我们需要知道的时间指标

  • L1 cache reference 0.5 ns
  • Branch mispredict 5 ns
  • L2 cache reference 7 ns
  • Mutex lock/unlock 100 ns
  • Main memory reference 100 ns
  • Compress 1K bytes with Zippy 10,000 ns
  • Send 2K bytes over 1 Gbps network 20,000 ns
  • Read 1 MB sequentially from memory 250,000 ns
  • Round trip within same datacenter 500,000 ns
  • Disk seek 10,000,000 ns
  • Read 1 MB sequentially from network 10,000,000 ns
  • Read 1 MB sequentially from disk 30,000,000 ns
  • Send packet CA->Netherlands->CA 150,000,000 ns
Reference:http://surana.wordpress.com/2009/01/01/numbers-everyone-should-know/

posted on 2013-03-19 00:47  Oracle和MySQL  阅读(209)  评论(0)  编辑  收藏  举报

导航