b.Fatal(err)
	}

	creds := globalActiveCred
	token, err := authenticateNode(creds.AccessKey, creds.SecretKey, "")
	if err != nil {
		b.Fatal(err)
	}

	b.ResetTimer()
	b.ReportAllocs()
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			err = xjwt.ParseWithStandardClaims(token, xjwt.NewStandardClaims(), []byte(creds.SecretKey))
			if err != nil {
				b.Fatal(err)
			}
		}
	})
}

	testenv.MustHaveExec(b)
	gotool, err := testenv.GoTool()
	if err != nil {
		b.Fatal(err)
	}

	// We collect extra metrics.
	var n, userTime, systemTime int64

	b.ResetTimer()
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			cmd := testenv.Command(b, gotool, "env", "GOARCH")

			if err := cmd.Run(); err != nil {
				b.Fatal(err)
			}
			atomic.AddInt64(&n, 1)

func BenchmarkTypeByExtension(b *testing.B) {
	initMime()
	b.ResetTimer()

	for _, ext := range []string{
		".html",
		".HTML",
		".unused",
	} {
		b.Run(ext, func(b *testing.B) {
			b.RunParallel(func(pb *testing.PB) {
				for pb.Next() {
					TypeByExtension(ext)
				}
			})
		})
	}
}

func BenchmarkExtensionsByType(b *testing.B) {
	initMime()
	b.ResetTimer()

	}
	for i := 0; i < 10; i++ {
		<-c
	}
}

func BenchmarkMutexUncontended(b *testing.B) {
	b.ResetTimer()
	b.ReportAllocs()

	type PaddedMutex struct {
		*DRWMutex
	}
	b.RunParallel(func(pb *testing.PB) {
		mu := PaddedMutex{NewDRWMutex(ds, "")}
		for pb.Next() {
			mu.Lock(id, source)
			mu.Unlock(context.Background())
		}
	})
}

		}()
		once.Do(func() {
			panic("failed")
		})
	}()

	once.Do(func() {
		t.Fatalf("Once.Do called twice")
	})
}

func BenchmarkOnce(b *testing.B) {
	var once Once
	f := func() {}
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			once.Do(f)
		}
	})

		RWMutex
		pad [32]uint32
	}
	b.RunParallel(func(pb *testing.PB) {
		var rwm PaddedRWMutex
		for pb.Next() {
			rwm.RLock()
			rwm.RLock()
			rwm.RUnlock()
			rwm.RUnlock()
			rwm.Lock()
			rwm.Unlock()
		}
	})
}

func benchmarkRWMutex(b *testing.B, localWork, writeRatio int) {
	var rwm RWMutex
	b.RunParallel(func(pb *testing.PB) {
		foo := 0
		for pb.Next() {

func TestFinalizerZeroSizedStruct(t *testing.T) {
	type Z struct{}
	z := new(Z)
	runtime.SetFinalizer(z, func(*Z) {})
}

func BenchmarkFinalizer(b *testing.B) {
	const Batch = 1000
	b.RunParallel(func(pb *testing.PB) {
		var data [Batch]*int
		for i := 0; i < Batch; i++ {
			data[i] = new(int)
		}
		for pb.Next() {
			for i := 0; i < Batch; i++ {
				runtime.SetFinalizer(data[i], fin)
			}

	if testing.Short() {
		N = 10
		iter = 10000
	}
	inc := uintptr(100)
	total := uintptr(0)
	runParallel(N, iter, func() {
		atomic.Xadduintptr(&total, inc)
	})
	if want := uintptr(N*iter) * inc; want != total {
		t.Fatalf("xadduintpr error, want %d, got %d", want, total)
	}
	total = 0
	runParallel(N, iter, func() {
		atomic.Xadduintptr(&total, inc)
		atomic.Xadduintptr(&total, uintptr(-int64(inc)))
	})

	b.Run("non-concurrent", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			h := NewHandle(i)
			_ = h.Value()
			h.Delete()
		}
	})
	b.Run("concurrent", func(b *testing.B) {
		b.RunParallel(func(pb *testing.PB) {
			var v int
			for pb.Next() {
				h := NewHandle(v)
				_ = h.Value()
				h.Delete()
			}
		})
	})

	cache := New[time.Time]()
	cache.InitOnce(1*time.Millisecond, Opts{},
		func(ctx context.Context) (time.Time, error) {
			return time.Now(), nil
		},
	)

	b.ReportAllocs()
	b.ResetTimer()

	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			cache.Get()
		}
	})