Random

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.

How to use

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)

Benchmark

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