- L1 cache reference: 0.5 ns
- Branch mispredict: 5 ns
- L2 cache reference: 7 ns
- Mutex lock/unlock: 100 ns
- Main memory reference: 100 ns
- Compress 1K bytes with Zippy: 10,000 ns
- Send 2K bytes over 1 Gbps network: 20,000 ns
- Read 1 MB sequentially from memory: 250,000 ns
- Round trip within same datacenter: 500,000 ns
- Disk seek: 10,000,000 ns
- Read 1 MB sequentially from network: 10,000,000 ns
- Read 1 MB sequentially from disk: 30,000,000 ns
- Greatest latency that appears real-time for interactive UI: 100,000,000 ns
- Greatest latency that appears real-time for query based UI: 250,000,000 ns
- Send packet CA->Netherlands->CA: 150,000,000 ns
Professional cruncher of 'impossible' problems. Philosopher. Scientist. Adventurer. Programming Working Simulator Programs on Mainframe Computers at 9 yrs old | First tech start-up at 16 yrs old | Wrote first OS at 17 yrs old | Grad school at 20 yrs old | Still learning more accelerating rapidly!
Friday, 10 April 2015
Numbers that every computer engineer should know.
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