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jboner / latency.txt
Last active May 6, 2024 07:06
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
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 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
var Rufus = {
Mnemo: {
/** CONSTANTS **/
V: [ 'a', 'e', 'i', 'o', 'u' ],
C: [ 'b', 'd', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'r', 's', 't', 'z' ],
SYL: [], // This is populated later on. [1]
SPECIAL: [