記錄一下，方便以后查詢
| Operation | Time |
|---|---|
| L1 cache reference 訪問一級緩存 | 0.5 ns |
| Branch mispredict(分支預測失敗) | 5 ns |
| L2 cache reference 訪問二級緩存 | 7 ns |
| Mutex lock/unlock 互斥鎖\解鎖 | 100 ns |
| Main memory reference 訪問主存 | 100 ns |
| Compress 1K bytes with Zippy 壓縮1k字節 | 10,000 ns/0.01ms |
| Send 2K bytes over 1 Gbps network 在1Gbps的網絡上發送2k字節 | 20,000 ns/0.02ms |
| Read 1 MB sequentially from memory 從主存中順序讀取1MB | 250,000 ns/0.25ms |
| Round trip within same datacenter 從數據中心內部往返一次 | 500,000 ns/0.5ms |
| Disk seek 磁盤搜索/尋道 | 10,000,000 ns /10ms |
| Read 1 MB sequentially from network 從網絡上順序讀取1M數據 | 10,000,000 ns/10ms |
| Read 1 MB sequentially from disk 從磁盤中順序讀出1MB數據 | 30,000,000 ns /30ms |
| Send packet CA->Netherlands->CA 一次遠程訪問時間 | 150,000,000 ns/150ms |
