[#4] limiting/semaphore: Add benchmark for semaphore

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

limiting/semaphore/semaphore_bench.result

@@ -0,0 +1,26 @@
+goos: linux
+goarch: amd64
+pkg: git.frostfs.info/TrueCloudLab/frostfs-qos/limiting/semaphore
+cpu: 12th Gen Intel(R) Core(TM) i5-1235U
+BenchmarkSemaphore/semaphore_size=1/lock_duration=0s-12         	 6113605	      1964 ns/op	       383.1 acquire-ns/op	       203.5 release-ns/op	         0.6892 success-rate
+BenchmarkSemaphore/semaphore_size=1/lock_duration=1µs-12        	 5826655	      2067 ns/op	       382.0 acquire-ns/op	       307.0 release-ns/op	         0.1460 success-rate
+BenchmarkSemaphore/semaphore_size=1/lock_duration=10µs-12       	 5977272	      2033 ns/op	       370.4 acquire-ns/op	       321.4 release-ns/op	         0.05408 success-rate
+BenchmarkSemaphore/semaphore_size=1/lock_duration=100µs-12      	 5862900	      2030 ns/op	       365.6 acquire-ns/op	       343.1 release-ns/op	         0.01242 success-rate
+BenchmarkSemaphore/semaphore_size=10/lock_duration=0s-12        	 5637050	      2173 ns/op	       365.2 acquire-ns/op	       261.7 release-ns/op	         0.9765 success-rate
+BenchmarkSemaphore/semaphore_size=10/lock_duration=1µs-12       	 5470316	      2225 ns/op	       390.4 acquire-ns/op	       357.2 release-ns/op	         0.9249 success-rate
+BenchmarkSemaphore/semaphore_size=10/lock_duration=10µs-12      	 5584527	      2134 ns/op	       395.2 acquire-ns/op	       339.0 release-ns/op	         0.5409 success-rate
+BenchmarkSemaphore/semaphore_size=10/lock_duration=100µs-12     	 5841032	      2036 ns/op	       369.4 acquire-ns/op	       330.7 release-ns/op	         0.1182 success-rate
+BenchmarkSemaphore/semaphore_size=100/lock_duration=0s-12       	 5600013	      2159 ns/op	       369.9 acquire-ns/op	       271.1 release-ns/op	         0.9976 success-rate
+BenchmarkSemaphore/semaphore_size=100/lock_duration=1µs-12      	 5323606	      2280 ns/op	       394.0 acquire-ns/op	       368.9 release-ns/op	         0.9697 success-rate
+BenchmarkSemaphore/semaphore_size=100/lock_duration=10µs-12     	 5133394	      2353 ns/op	       405.8 acquire-ns/op	       374.5 release-ns/op	         0.9498 success-rate
+BenchmarkSemaphore/semaphore_size=100/lock_duration=100µs-12    	 5238136	      2303 ns/op	       387.2 acquire-ns/op	       362.2 release-ns/op	         0.8749 success-rate
+BenchmarkSemaphore/semaphore_size=1000/lock_duration=0s-12      	 5408720	      2180 ns/op	       367.6 acquire-ns/op	       271.5 release-ns/op	         0.9992 success-rate
+BenchmarkSemaphore/semaphore_size=1000/lock_duration=1µs-12     	 5114854	      2366 ns/op	       407.9 acquire-ns/op	       376.4 release-ns/op	         0.9966 success-rate
+BenchmarkSemaphore/semaphore_size=1000/lock_duration=10µs-12    	 4659454	      2438 ns/op	       412.2 acquire-ns/op	       385.9 release-ns/op	         0.9800 success-rate
+BenchmarkSemaphore/semaphore_size=1000/lock_duration=100µs-12   	 4837894	      2482 ns/op	       401.7 acquire-ns/op	       380.9 release-ns/op	         0.9725 success-rate
+BenchmarkSemaphore/semaphore_size=10000/lock_duration=0s-12     	 5403058	      2188 ns/op	       367.5 acquire-ns/op	       273.1 release-ns/op	         1.000 success-rate
+BenchmarkSemaphore/semaphore_size=10000/lock_duration=1µs-12    	 5086929	      2306 ns/op	       390.6 acquire-ns/op	       376.3 release-ns/op	         1.000 success-rate
+BenchmarkSemaphore/semaphore_size=10000/lock_duration=10µs-12   	 5059968	      2378 ns/op	       410.2 acquire-ns/op	       384.5 release-ns/op	         1.000 success-rate
+BenchmarkSemaphore/semaphore_size=10000/lock_duration=100µs-12  	 4909206	      2420 ns/op	       408.4 acquire-ns/op	       383.4 release-ns/op	         1.000 success-rate
+PASS
+ok  	git.frostfs.info/TrueCloudLab/frostfs-qos/limiting/semaphore	284.895s

limiting/semaphore/semaphore_bench_test.go

@@ -0,0 +1,95 @@
+package semaphore_test
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+
+	semaphores "git.frostfs.info/TrueCloudLab/frostfs-qos/limiting/semaphore"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/sync/errgroup"
+)
+
+const maxWorkers = 10_000_000
+
+type benchmarkSemaphoreMetrics struct {
+	mu sync.Mutex
+
+	acquireDuration,
+	releaseDuration time.Duration
+
+	acquireCount,
+	releaseCount uint64
+}
+
+func (c *benchmarkSemaphoreMetrics) reportAcquire(duration time.Duration) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.acquireDuration += duration
+	c.acquireCount += 1
+}
+
+func (c *benchmarkSemaphoreMetrics) reportRelease(duration time.Duration) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.releaseDuration += duration
+	c.releaseCount += 1
+}
+
+func (c *benchmarkSemaphoreMetrics) getResults() (timePerAcquire, timePerRelease, successRate float64) {
+	timePerAcquire = float64(c.acquireDuration) / float64(c.acquireCount)
+	timePerRelease = float64(c.releaseDuration) / float64(c.releaseCount)
+	successRate = float64(c.releaseCount) / float64(c.acquireCount)
+	return
+}
+
+func BenchmarkSemaphore(b *testing.B) {
+	sizes := []int64{1, 10, 100, 1000, 10000}
+	lockDurations := []time.Duration{0, time.Microsecond, 10 * time.Microsecond, 100 * time.Microsecond}
+
+	for _, size := range sizes {
+		for _, lockDuration := range lockDurations {
+			name := fmt.Sprintf("semaphore_size=%d/lock_duration=%v", size, lockDuration)
+			b.Run(name, func(b *testing.B) {
+				benchmarkSemaphore(b, semaphores.NewSemaphore(size), lockDuration)
+			})
+		}
+	}
+}
+
+func benchmarkSemaphore(b *testing.B, sem *semaphores.Semaphore, lockDuration time.Duration) {
+	var m benchmarkSemaphoreMetrics
+	var g errgroup.Group
+	g.SetLimit(maxWorkers)
+
+	for range b.N {
+		g.Go(func() error {
+			now := time.Now()
+			ok := sem.Acquire()
+			m.reportAcquire(time.Since(now))
+
+			if !ok {
+				return nil
+			}
+
+			time.Sleep(lockDuration)
+
+			now = time.Now()
+			sem.Release()
+			m.reportRelease(time.Since(now))
+
+			return nil
+		})
+	}
+	require.NoError(b, g.Wait())
+
+	require.Equal(b, uint64(b.N), m.acquireCount)
+	require.LessOrEqual(b, m.releaseCount, m.acquireCount)
+
+	timePerAcquire, timePerRelease, successRate := m.getResults()
+
+	b.ReportMetric(timePerAcquire, "acquire-ns/op")
+	b.ReportMetric(timePerRelease, "release-ns/op")
+	b.ReportMetric(successRate, "success-rate")
+}