clock

type Clock ¶

type Clock struct {
	// contains filtered or unexported fields
}

Clock is a fast clock for getting current time. It caches time and updates it in fixed duration which may return an "incorrect" time compared with time.Now().UnixNano(). In fact, we don't recommend you to use it unless you have to... According to our benchmarks, it does run faster than time.Now:

In my win10 pc: goos: windows goarch: amd64 cpu: AMD Ryzen 7 5800X 8-Core Processor BenchmarkTimeNow-16 338466458 3.523 ns/op 0 B/op 0 allocs/op BenchmarkClockNow-16 1000000000 0.2165 ns/op 0 B/op 0 allocs/op

In my macbook with charging: goos: darwin goarch: amd64 pkg: github.com/FishGoddess/cachego/pkg/clock cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz BenchmarkTimeNow-12 17841402 67.05 ns/op 0 B/op 0 allocs/op BenchmarkClockNow-12 1000000000 0.2528 ns/op 0 B/op 0 allocs/op

In my cloud server using 2 cores and running benchmarks in docker container: goos: linux goarch: amd64 pkg: github.com/FishGoddess/cachego/pkg/clock cpu: AMD EPYC 7K62 48-Core Processor BenchmarkTimeNow-2 17946441 65.62 ns/op 0 B/op 0 allocs/op BenchmarkClockNow-2 1000000000 0.3162 ns/op 0 B/op 0 allocs/op

PS: All benchmarks are ran with "go test -bench=. -benchtime=1s".

However, the performance of time.Now is faster enough in many os and is enough for 99.9% situations. The another reason choosing to use it is . So, better performance should not be the first reason to use it. The first reason to use it is reducing gc objects, but we hope you never use it :)

func New() *Clock

func (c *Clock) Now() int64