Latency Numbers Every Programmer Should Know (shell command)

latencynumbers

#!/bin/sh

cat << EOF

Operation                                Latency (ns)     (ms)  
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
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD               150,000   ns    0.15 ms
Read 1 MB sequentially from memory      250,000   ns    0.25 ms
Round trip within same datacenter       500,000   ns    0.5  ms
Read 1 MB sequentially from SSD       1,000,000   ns    1    ms
Disk seek                            10,000,000   ns   10    ms
Read 1 MB sequentially from disk     20,000,000   ns   20    ms
Send packet CA->Netherlands->CA     150,000,000   ns  150    ms

EOF