Eg.
package main
import (
"fmt"
"math"
"github.com/JessonChan/fastfunc"
)
func main() {
fastfunc.SetRunTimes(1e7)
fmt.Println("func 1", fastfunc.Run(func() {
for i := 0; i < 3; i++ {
math.Pow(float64(i), 2)
}
})/1e6, "microsecond")
fmt.Println("func 2", fastfunc.Run(func() {
}), "nanosecond")
}