Numbers everyone should know from
Jeff Dean's
talk at Stanford:
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 [.02 ms]
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 [10 ms]
Read 1 MB sequentially from disk 30,000,000 ns
Send packet CA to Netherlands to CA 150,000,000 ns
From Cuong Do's
Youtube Scalability talk:
Page rendering time: keep less than 100 ms
There are also some interesting number on Wikipedia's
Google platform page.