Monthly Archives: April 2012

后端优化 — Numbers You Should Know

原文地址:我对后端优化的一点想法by童家旺(2012DTCC) L1 cache reference 0.5 ns(1GHz CPU) Branch mispredict 5 ns L2 cache reference 7 ns Mutex lock/unlock 25 ns Main memeory reference 100 ns Compress 1k bytes with Zippy 3,000 ns Send 2k bytes over 1Gbps network 20,000 ns Read 1MB sequentialy from main memory 250,000 ns Round trip with same datacenter 500,000 ns [...]