joelklabo
/ latency.txt
Created
September 14, 2012 03:38
— forked from nahurst/latency.txt
Latency Numbers Every Programmer Should Know
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| Latency Comparison Numbers Time Light Distance Approximate Light Distance | |
| -------------------------- ---- -------------- -------------------------- | |
| L1 cache reference 0.5 ns 0.15 m Diagonal across your smartphone | |
| Branch mispredict 5 ns 1.5 m Height of Natalie Portman | |
| L2 cache reference 7 ns 2.1 m Height of Shaq | |
| Mutex lock/unlock 25 ns 7.5 m Height of a school flag pole | |
| Main memory reference 100 ns 30 m Half a Manhattan city block (North/South) | |
| Compress 1K bytes with Zippy 3,000 ns 900 m Width of Central Park | |
| Send 1K bytes over 1 Gbps network 10,000 ns 3,000 m Width of Manhattan | |
| Read 4K randomly from SSD* 150,000 ns 45,000 m NYC to Hempstead on Long Island |