ruony's image ruony 113
2/15 '14 posted

Programmers should know numbers

Jeff Dean, a brilliant engineer at Google, gave a talk a while ago listing the numbers every engineer should know. I copied these from here.

  • 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
  • Send packet CA->Netherlands->CA 150,000,000 ns

embed
goodhyun's image goodhyun 1.2K377
2/17 '14 answered

응답하라 1994

오호, 여기의 인포그래픽에서는 슬라이더로 그 해의 수치를 볼 수도 있군요...
응답하라 1994...

embed|permanent link