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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package eventbus_test
import (
"math/rand/v2"
"testing"
"tailscale.com/util/eventbus"
)
func BenchmarkBasicThroughput(b *testing.B) {
bus := eventbus.New()
pcli := bus.Client(b.Name() + "-pub")
scli := bus.Client(b.Name() + "-sub")
type emptyEvent [0]byte
// One publisher and a corresponding subscriber shoveling events as fast as
// they can through the plumbing.
pub := eventbus.Publish[emptyEvent](pcli)
sub := eventbus.Subscribe[emptyEvent](scli)
go func() {
for {
select {
case <-sub.Events():
continue
case <-sub.Done():
return
}
}
}()
for b.Loop() {
pub.Publish(emptyEvent{})
}
bus.Close()
}
func BenchmarkSubsThroughput(b *testing.B) {
bus := eventbus.New()
pcli := bus.Client(b.Name() + "-pub")
scli1 := bus.Client(b.Name() + "-sub1")
scli2 := bus.Client(b.Name() + "-sub2")
type emptyEvent [0]byte
// One publisher and two subscribers shoveling events as fast as they can
// through the plumbing.
pub := eventbus.Publish[emptyEvent](pcli)
sub1 := eventbus.Subscribe[emptyEvent](scli1)
sub2 := eventbus.Subscribe[emptyEvent](scli2)
for _, sub := range []*eventbus.Subscriber[emptyEvent]{sub1, sub2} {
go func() {
for {
select {
case <-sub.Events():
continue
case <-sub.Done():
return
}
}
}()
}
for b.Loop() {
pub.Publish(emptyEvent{})
}
bus.Close()
}
func BenchmarkMultiThroughput(b *testing.B) {
bus := eventbus.New()
cli := bus.Client(b.Name())
type eventA struct{}
type eventB struct{}
// Two disjoint event streams routed through the global order.
apub := eventbus.Publish[eventA](cli)
asub := eventbus.Subscribe[eventA](cli)
bpub := eventbus.Publish[eventB](cli)
bsub := eventbus.Subscribe[eventB](cli)
go func() {
for {
select {
case <-asub.Events():
continue
case <-asub.Done():
return
}
}
}()
go func() {
for {
select {
case <-bsub.Events():
continue
case <-bsub.Done():
return
}
}
}()
var rng uint64
var bits int
for b.Loop() {
if bits == 0 {
rng = rand.Uint64()
bits = 64
}
if rng&1 == 0 {
apub.Publish(eventA{})
} else {
bpub.Publish(eventB{})
}
rng >>= 1
bits--
}
bus.Close()
}
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