test: revert unintentional commits

I thought I am in a different repo...

test/bench/perf/bench1.go

-package main
-
-import (
-	"time"
-)
-
-func main() {
-	PerfBenchmark(SleepBenchmark)
-}
-
-func SleepBenchmark(N int64) (metrics []PerfMetric, err error) {
-	time.Sleep(time.Duration(N) * time.Millisecond)
-	metrics = append(metrics, PerfMetric{"foo", 42})
-	return
-}

test/bench/perf/bench2.go

-package main
-
-func Benchmark(N int64) error {
-	return nil
-}

test/bench/perf/driver.go

-package main
-
-import (
-	"flag"
-	"fmt"
-	"log"
-	"time"
-	"runtime"
-)
-
-var (
-	benchNum  = flag.Int("benchnum", 3, "run each benchmark that many times")
-	benchTime = flag.Duration("benchtime", 10*time.Second, "benchmarking time for a single run")
-	benchMem  = flag.Int("benchmem", 64, "approx RSS value to aim at in benchmarks, in MB")
-)
-
-type PerfResult struct {
-	N       int64
-	RunTime time.Duration
-	Metrics []PerfMetric
-}
-
-type PerfMetric struct {
-	Type  string
-	Val   int64
-}
-
-type BenchFunc func(N int64) ([]PerfMetric, error)
-
-func PerfBenchmark(f BenchFunc) {
-	if !flag.Parsed() {
-		flag.Parse()
-	}
-	var res PerfResult
-	for i := 0; i < *benchNum; i++ {
-		res1 := RunBenchmark(f)
-		if res.RunTime == 0 || res.RunTime > res1.RunTime {
-			res = res1
-		}
-	}
-	fmt.Printf("GOPERF-METRIC:runtime=%v\n", int64(res.RunTime)/res.N)
-	for _, m := range res.Metrics {
-		fmt.Printf("GOPERF-METRIC:%v=%v\n", m.Type, m.Val)
-	}
-}
-
-func RunBenchmark(f BenchFunc) PerfResult {
-	var res PerfResult
-	for ChooseN(&res) {
-		log.Printf("Benchmarking %v iterations\n", res.N)
-		res = RunOnce(f, res.N)
-		log.Printf("Done: %+v\n", res)
-	}
-	return res
-}
-
-func RunOnce(f BenchFunc, N int64) PerfResult {
-	runtime.GC()
-	mstats0 := new(runtime.MemStats)
-	runtime.ReadMemStats(mstats0)
-	res := PerfResult{N: N}
-
-	t0 := time.Now()
-	var err error
-	res.Metrics, err = f(N)
-	res.RunTime = time.Since(t0)
-
-	if err != nil {
-		log.Fatalf("Benchmark function failed: %v\n", err)
-	}
-
-	mstats1 := new(runtime.MemStats)
-	runtime.ReadMemStats(mstats1)
-	fmt.Printf("%+v\n", *mstats1)
-	return res
-}
-
-func ChooseN(res *PerfResult) bool {
-	const MaxN = 1e12
-	last := res.N
-	if last == 0 {
-		res.N = 1
-		return true
-	} else if res.RunTime >= *benchTime || last >= MaxN {
-		return false
-	}
-	nsPerOp := max(1, int64(res.RunTime)/last)
-	res.N = int64(*benchTime) / nsPerOp
-	res.N = max(min(res.N+res.N/2, 100*last), last+1)
-	res.N = roundUp(res.N)
-	return true
-}
-
-func roundUp(n int64) int64 {
-	tmp := n
-	base := int64(1)
-	for tmp >= 10 {
-		tmp /= 10
-		base *= 10
-	}
-	switch {
-	case n <= base:
-		return base
-	case n <= (2 * base):
-		return 2 * base
-	case n <= (5 * base):
-		return 5 * base
-	default:
-		return 10 * base
-	}
-	panic("unreachable")
-	return 0
-}
-
-func min(a, b int64) int64 {
-	if a < b {
-		return a
-	}
-	return b
-}
-
-func max(a, b int64) int64 {
-	if a > b {
-		return a
-	}
-	return b
-}