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jboner / latency.txt
Last active Jan 23, 2021
Latency Numbers Every Programmer Should Know
View latency.txt
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
stefanv /
Created Nov 17, 2011
Command line sparks in Python
# coding=utf-8
# Python version of Zach Holman's "spark"
# by Stefan van der Walt <>
View index.html
<!DOCTYPE html>
<html >
<script type="text/javascript" src=""></script>
<div class="example_div"></div>
<script type="text/javascript">
var tooltip ="body")