test(lang/syncx): add benchmark for RWMutex

lang/syncx/rwmutex_test.go

@@ -0,0 +1,160 @@
+// Copyright 2021 ByteDance Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package syncx
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+
+	"github.com/bytedance/gopkg/lang/fastrand"
+)
+
+func BenchmarkRWMutex100Read(b *testing.B) {
+	for nWorker := 1; nWorker <= 256; nWorker <<= 2 {
+		b.Run(fmt.Sprintf("syncx-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncxRWMutexNWriteNRead(b, nWorker, 0)
+		})
+
+		b.Run(fmt.Sprintf("sync-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncRWMutexNWriteNRead(b, nWorker, 0)
+		})
+	}
+}
+
+func BenchmarkRWMutex1Write99Read(b *testing.B) {
+	for nWorker := 1; nWorker <= 256; nWorker <<= 2 {
+		b.Run(fmt.Sprintf("syncx-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncxRWMutexNWriteNRead(b, nWorker, 1)
+		})
+
+		b.Run(fmt.Sprintf("sync-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncRWMutexNWriteNRead(b, nWorker, 1)
+		})
+	}
+}
+
+func BenchmarkRWMutex10Write90Read(b *testing.B) {
+	for nWorker := 1; nWorker <= 256; nWorker <<= 2 {
+		b.Run(fmt.Sprintf("syncx-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncxRWMutexNWriteNRead(b, nWorker, 10)
+		})
+
+		b.Run(fmt.Sprintf("sync-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncRWMutexNWriteNRead(b, nWorker, 10)
+		})
+	}
+}
+
+func BenchmarkRWMutex50Write50Read(b *testing.B) {
+	for nWorker := 1; nWorker <= 256; nWorker <<= 2 {
+		b.Run(fmt.Sprintf("syncx-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncxRWMutexNWriteNRead(b, nWorker, 50)
+		})
+
+		b.Run(fmt.Sprintf("sync-%d", nWorker), func(b *testing.B) {
+			benchmarkSyncRWMutexNWriteNRead(b, nWorker, 50)
+		})
+	}
+}
+
+func benchmarkSyncRWMutexNWriteNRead(b *testing.B, nWorker, nWrite int) {
+	var res int // A mock resource we contention for
+
+	var mu sync.RWMutex
+	mu.Lock()
+
+	var wg sync.WaitGroup
+	wg.Add(nWorker)
+
+	n := b.N
+	quota := n / nWorker
+
+	for g := nWorker; g > 0; g-- {
+		// Comuse remaining quota
+		if g == 1 {
+			quota = n
+		}
+		go func(quota int) {
+			for i := 0; i < quota; i++ {
+				if fastrand.Intn(100) > nWrite-1 {
+					mu.RLock()
+					_ = res
+					mu.RUnlock()
+				} else {
+					mu.Lock()
+					res++
+					mu.Unlock()
+				}
+			}
+			wg.Done()
+		}(quota)
+
+		n -= quota
+	}
+
+	if n != 0 {
+		b.Fatalf("Incorrect quota assignments: %v remaining", n)
+	}
+
+	b.ResetTimer()
+	mu.Unlock()
+	wg.Wait()
+}
+
+func benchmarkSyncxRWMutexNWriteNRead(b *testing.B, nWorker, nWrite int) {
+	var res int // A mock resource we contention for
+
+	mu := NewRWMutex()
+	mu.Lock()
+
+	var wg sync.WaitGroup
+	wg.Add(nWorker)
+
+	n := b.N
+	quota := n / nWorker
+
+	for g := nWorker; g > 0; g-- {
+		// Comuse remaining quota
+		if g == 1 {
+			quota = n
+		}
+		go func(quota int) {
+			rmu := mu.RLocker()
+			for i := 0; i < quota; i++ {
+				if fastrand.Intn(100) > nWrite-1 {
+					rmu.Lock()
+					_ = res
+					rmu.Unlock()
+				} else {
+					mu.Lock()
+					res++
+					mu.Unlock()
+				}
+			}
+			wg.Done()
+		}(quota)
+
+		n -= quota
+	}
+
+	if n != 0 {
+		b.Fatalf("Incorrect quota assignments: %v remaining", n)
+	}
+
+	b.ResetTimer()
+	mu.Unlock()
+	wg.Wait()
+}