mikea

L1 cache reference                  0.5 ns
Branch mispredict                   5 ns
L2 cache reference                  7 ns                      14x L1 cache
Mutex lock/unlock                   25 ns                     
Main memory reference               100 ns                    4x mutex op, 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy        3,000 ns
Send 2K bytes over 1 Gbps network   20,000 ns
Read 1 MB sequentially from memory  250,000 ns

mikea

L1 cache reference                  0.5 ns
Branch mispredict                   5 ns
L2 cache reference                  7 ns
Mutex lock/unlock                   25 ns
Main memory reference               100 ns             
Compress 1K bytes with Zippy        3,000 ns           3 µs
Send 2K bytes over 1 Gbps network   20,000 ns         20 µs
Read 1 MB sequentially from memory  250,000 ns       250 µs
Round trip within same datacenter   500,000 ns       0.5 ms
Disk seek                           10,000,000 ns     10 ms