Hi, I'm Gabo (Gabriel).

Software Engineer, Open-Source Enthusiast, Car guy

Numbers everybody should know

By mrgkanev | 13 Mar, 2020 | 2 minutes read

As some of you may be awear I’m making a SaaS named AntiProxies. (cool right) Because it is my first big project I watch/learn at least from one presentation/talk/conference. This is a small part of one of the presentations named “Software Engineering Advice from Building Large-Scale Distributed Systems”. Let’s be onest I’m not the remembering type of person, but I was fascinated by it and even one day later (I forget in about 5 minutes.) I could tell you more than half of the numbers and why it was important to know them. It is a great presentation by Jeff Dean who now is the lead of Google AI division.

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 0.01 ms
Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms
Read 1 MB sequentially from memory 250,000 ns 0.25 ms
Round trip within same datacenter 500,000 ns 0.5 ms
Disk seek 10,000,000 ns 10 ms
Read 1 MB sequentially from network 10,000,000 ns 10 ms
Read 1 MB sequentially from disk 30,000,000 ns 30 ms
Send packet CA->Netherlands->CA 150,000,000 ns 150 ms

1 ns = 10-9 seconds 1 ms = 10-3 seconds