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Jeff Dean's highly useful (napkin-sketching) numbers: - 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 I haven't quite made the transition to adopting the nanosecond as reference timespan yet; therefore, in operations per second (caveat interpretor): - L1 cache reference: 2g/s - L2 cache reference: 150m/s - Main memory reference: 10m/s - Disk seek: 100/s - Read 1 MB sequentially from memory: 4000/s - Read 1 MB sequentially from network: 100/s - Read 1 MB sequentially from disk: 33/s |
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