性能测试

goos: linux
goarch: amd64
pkg: github.com/gogf/gf/v2/os/gtimer
Benchmark_Add-12                         4048776               291.9 ns/op           249 B/op          6 allocs/op
Benchmark_StartStop-12                  100000000              10.96 ns/op             0 B/op          0 allocs/op
PASS
ok      command-line-arguments    6.602s