Fast Random Generator for use from single threaded data injection code. It is especially useful if you need to load test a service while generating random data. It that case, the random generator locks can become a bottleneck.
You first need to create a RandomUnsafe generator:
r := random.NewRandomUnsafe()You will need to keep it as a reference. Please not that it is only safe to use from a single thread, but you can
generate several RandomUnsafe values at the beginning of different Goroutines.
You can then call one of the available method to generate specific values.
For example, to generate an Int:
r.Intn(100)To generate a variable length string between 15 and 20 characters:
r.String(15, 25)Here are a few example showing the gain
$ go test -bench .
goos: darwin
goarch: amd64
pkg: fluux.io/random
BenchmarkRandString-4 2000000 808 ns/op
BenchmarkRandomString-4 20000000 56.5 ns/op
BenchmarkRandId-4 1000000 1665 ns/op
BenchmarkRandomId-4 1000000 1053 ns/op
BenchmarkRandInt-4 50000000 32.0 ns/op
BenchmarkRandomInt-4 100000000 23.2 ns/op
PASS
ok fluux.io/random 10.386s