Golang中encoding / gob和encoding / json之间的区别

Question

I am writing an application in GO which uses encoding/gob to send structures and slices over UDP between nodes. It works fine but I notice that encoding/json also has the similar API. Searched and found this information(https://golang.org/pkg/encoding/):

gob Package gob manages streams of gobs - binary values exchanged between an Encoder (transmitter) and a Decoder (receiver).
json Package json implements encoding and decoding of JSON as defined in RFC 4627.

Can someone explain to me whether one is more efficient than the other and in general compare when to choose what? Also if I need to interface with a non-golang application, I guess json would be preferred?

Answer 1

Gob is much more preferred when communicating between Go programs. However, gob is currently supported only in Go and, well, C, so only ever use that when you're sure no program written in any other programming language will try to decode the values.

When it comes to performance, at least on my machine, Gob outperforms JSON by a long shot. Test file (put in a folder on its own under your GOPATH)

$ go test -bench=.        
testing: warning: no tests to run
BenchmarkGobEncoding-4           1000000              1172 ns/op
BenchmarkJSONEncoding-4           500000              2322 ns/op
BenchmarkGobDecoding-4           5000000               486 ns/op
BenchmarkJSONDecoding-4           500000              3228 ns/op
PASS
ok      testencoding    6.814s