记录一下，方便以后查询
| Operation | Time |
|---|---|
| L1 cache reference 访问一级缓存 | 0.5 ns |
| Branch mispredict(分支预测失败) | 5 ns |
| L2 cache reference 访问二级缓存 | 7 ns |
| Mutex lock/unlock 互斥锁\解锁 | 100 ns |
| Main memory reference 访问主存 | 100 ns |
| Compress 1K bytes with Zippy 压缩1k字节 | 10,000 ns/0.01ms |
| Send 2K bytes over 1 Gbps network 在1Gbps的网络上发送2k字节 | 20,000 ns/0.02ms |
| Read 1 MB sequentially from memory 从主存中顺序读取1MB | 250,000 ns/0.25ms |
| Round trip within same datacenter 从数据中心内部往返一次 | 500,000 ns/0.5ms |
| Disk seek 磁盘搜索/寻道 | 10,000,000 ns /10ms |
| Read 1 MB sequentially from network 从网络上顺序读取1M数据 | 10,000,000 ns/10ms |
| Read 1 MB sequentially from disk 从磁盘中顺序读出1MB数据 | 30,000,000 ns /30ms |
| Send packet CA->Netherlands->CA 一次远程访问时间 | 150,000,000 ns/150ms |
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