mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
142670b8c2
Package mono provides a fast monotonic time. Its primary advantage is that it is fast: It is approximately twice as fast as time.Now. This is because time.Now uses two clock calls, one for wall time and one for monotonic time. We ask for the current time 4-6 times per network packet. At ~50ns per call to time.Now, that's enough to show up in CPU profiles. Package mono is a first step towards addressing that. It is designed to be a near drop-in replacement for package time. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
31 lines
612 B
Go
31 lines
612 B
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package mono
|
|
|
|
import (
|
|
"testing"
|
|
"time"
|
|
)
|
|
|
|
func TestNow(t *testing.T) {
|
|
start := Now()
|
|
time.Sleep(100 * time.Millisecond)
|
|
if elapsed := Since(start); elapsed < 100*time.Millisecond {
|
|
t.Errorf("short sleep: %v elapsed, want min %v", elapsed, 100*time.Millisecond)
|
|
}
|
|
}
|
|
|
|
func BenchmarkMonoNow(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
Now()
|
|
}
|
|
}
|
|
|
|
func BenchmarkTimeNow(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
time.Now()
|
|
}
|
|
}
|