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---
tags:
- golang
- howto
---
Simple timing can be done using the time package.
```
import time
import fmt
func main() {
start := time.Now()
elapsed = time.Since(start).Seconds()
fmt.Printf("%.2fs", elapsed)
}
```
Writing benchmarks. They look similar to tests:
```
import testing
func BenchmarkSome(b *testing.B) {
for i := 0; i < b.N; i++ {
Some()
}
}
```
b.N is supplied by test driver and is dynamically changed depending on runtime.
`go test -bench=<regex>`
This just benchmarks a function being called many times, comparative benchmarks can be written using a regular function being called from Benchmarks, something like so :
```
import testing
func doBench(b *testing.B, size int) { ... vary inputs size }
func Bench1(b *testing.B)
func Bench10(b *testing.B)
func Bench100(b * testing.B)
```
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