Slide 16
Slide 16 text
Geoff Gerrietts
@ggerrietts
• L1 cache reference: 1ns
• Branch mispredict: 3ns
• Mutex lock/unlock: 17ns
• Main memory reference: 100ns
• SSD random read: 16,000ns (16µs)
• Read 1M bytes from SSD: 123,000ns (123µs)
• Round-trip in data center: 500,000ns (500µs)
• Read 1M bytes from disk: 1Mns (1ms)
• Disk seek: 3Mns (3ms)
• Round-trip, CA to Amsterdam: 150Mns (150ms)
Geoff Gerrietts
@ggerrietts
Source: http://www.eecs.berkeley.edu/~rcs/research/interactive_latency.html
● A key tool in our kit is knowing where latency comes from.
● This is our razor, the thing we use to guide our suspicions.
● The “Jeff Dean” numbers, really originate out of Berkeley.
● They have an interactive graph where you can see the numbers change over
time, shout out to the speed of light