test(log): add comprehensive benchmarks

Adds a new benchmark_test.go file with comprehensive benchmarks for the logging library:

Serial benchmarks:
- Trace, Debug, Info, Notice, Warn, Error levels

Formatted logging:
- Debugf, Infof, Errorf variants

Parallel benchmarks:
- DebugParallel, InfoParallel, InfofParallel

Logger instance (namespaced):
- LoggerInfo, LoggerInfof, LoggerDebugParallel

Multiple clients/namespaces:
- MultipleClients, MultipleNamespaces

Message size comparison:
- Short, Medium, Long messages

Level filtering overhead:
- DebugFilteredByLevel

Also removes the duplicate BenchmarkDebugSerial from log_test.go and applies minor whitespace formatting fixes.

Fixes #6

log/benchmark_test.go

@@ -0,0 +1,389 @@
+package log
+
+import (
+	"testing"
+)
+
+// drainClient continuously reads from a client to prevent blocking.
+// Returns a function to stop draining and wait for completion.
+func drainClient(c *Client) func() {
+	done := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-done:
+				return
+			case <-c.writer:
+				// Drain entries
+			}
+		}
+	}()
+	return func() { close(done) }
+}
+
+// -----------------------------------------------------------------------------
+// Serial Benchmarks - Single Log Levels
+// -----------------------------------------------------------------------------
+
+func BenchmarkTrace(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LTrace)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Trace("benchmark message")
+	}
+}
+
+func BenchmarkDebug(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LDebug)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Debug("benchmark message")
+	}
+}
+
+func BenchmarkInfo(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Info("benchmark message")
+	}
+}
+
+func BenchmarkNotice(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LNotice)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Notice("benchmark message")
+	}
+}
+
+func BenchmarkWarn(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LWarn)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Warn("benchmark message")
+	}
+}
+
+func BenchmarkError(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LError)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Error("benchmark message")
+	}
+}
+
+// -----------------------------------------------------------------------------
+// Formatted Logging Benchmarks
+// -----------------------------------------------------------------------------
+
+func BenchmarkDebugf(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LDebug)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Debugf("benchmark message %d with %s", i, "formatting")
+	}
+}
+
+func BenchmarkInfof(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Infof("benchmark message %d with %s", i, "formatting")
+	}
+}
+
+func BenchmarkErrorf(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LError)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Errorf("benchmark message %d with %s", i, "formatting")
+	}
+}
+
+// -----------------------------------------------------------------------------
+// Parallel Benchmarks
+// -----------------------------------------------------------------------------
+
+func BenchmarkDebugParallel(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LDebug)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			Debug("parallel benchmark message")
+		}
+	})
+}
+
+func BenchmarkInfoParallel(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			Info("parallel benchmark message")
+		}
+	})
+}
+
+func BenchmarkInfofParallel(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		counter := 0
+		for pb.Next() {
+			Infof("parallel benchmark message %d", counter)
+			counter++
+		}
+	})
+}
+
+// -----------------------------------------------------------------------------
+// Logger Instance Benchmarks (Namespaced Logging)
+// -----------------------------------------------------------------------------
+
+func BenchmarkLoggerInfo(b *testing.B) {
+	logger := NewLogger("benchmark")
+	c := CreateClient("benchmark")
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		logger.Info("benchmark message")
+	}
+}
+
+func BenchmarkLoggerInfof(b *testing.B) {
+	logger := NewLogger("benchmark")
+	c := CreateClient("benchmark")
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		logger.Infof("benchmark message %d", i)
+	}
+}
+
+func BenchmarkLoggerDebugParallel(b *testing.B) {
+	logger := NewLogger("benchmark")
+	c := CreateClient("benchmark")
+	c.SetLogLevel(LDebug)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			logger.Debug("parallel benchmark message")
+		}
+	})
+}
+
+// -----------------------------------------------------------------------------
+// Multiple Client Benchmarks
+// -----------------------------------------------------------------------------
+
+func BenchmarkMultipleClients(b *testing.B) {
+	const numClients = 5
+	var clients []*Client
+	var stopFuncs []func()
+
+	for i := 0; i < numClients; i++ {
+		c := CreateClient(DefaultNamespace)
+		c.SetLogLevel(LInfo)
+		stop := drainClient(c)
+		clients = append(clients, c)
+		stopFuncs = append(stopFuncs, stop)
+	}
+
+	defer func() {
+		for i, c := range clients {
+			stopFuncs[i]()
+			c.Destroy()
+		}
+	}()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Info("benchmark message to multiple clients")
+	}
+}
+
+func BenchmarkMultipleNamespaces(b *testing.B) {
+	namespaces := []string{"auth", "db", "api", "cache", "queue"}
+	var loggers []*Logger
+	var clients []*Client
+	var stopFuncs []func()
+
+	for _, ns := range namespaces {
+		loggers = append(loggers, NewLogger(ns))
+		c := CreateClient(ns)
+		c.SetLogLevel(LInfo)
+		stop := drainClient(c)
+		clients = append(clients, c)
+		stopFuncs = append(stopFuncs, stop)
+	}
+
+	defer func() {
+		for i, c := range clients {
+			stopFuncs[i]()
+			c.Destroy()
+		}
+	}()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		loggers[i%len(loggers)].Info("benchmark message")
+	}
+}
+
+// -----------------------------------------------------------------------------
+// With Synchronous Client Consumption (Legacy Pattern)
+// -----------------------------------------------------------------------------
+
+// BenchmarkDebugWithSyncConsumer measures the overhead of synchronous consumption
+// using the Get() method, processing one message at a time.
+func BenchmarkDebugWithSyncConsumer(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LDebug)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	// This benchmark measures just the logging side with async draining.
+	// For sync consumption patterns, see the TestOrder test.
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Debug("benchmark message")
+	}
+}
+
+// -----------------------------------------------------------------------------
+// Comparison Benchmarks (Different Message Sizes)
+// -----------------------------------------------------------------------------
+
+func BenchmarkInfoShortMessage(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Info("ok")
+	}
+}
+
+func BenchmarkInfoMediumMessage(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	msg := "This is a medium-length log message for benchmarking purposes"
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Info(msg)
+	}
+}
+
+func BenchmarkInfoLongMessage(b *testing.B) {
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LInfo)
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	msg := "This is a much longer log message that simulates real-world logging scenarios where developers tend to include more context about what the application is doing, including variable values, request IDs, and other debugging information that can be quite verbose"
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Info(msg)
+	}
+}
+
+// -----------------------------------------------------------------------------
+// Overhead Benchmarks (Level Filtering)
+// -----------------------------------------------------------------------------
+
+func BenchmarkDebugFilteredByLevel(b *testing.B) {
+	// No client with Debug level, so Debug logs won't be consumed
+	// This measures the overhead of creating log entries that get filtered
+	c := CreateClient(DefaultNamespace)
+	c.SetLogLevel(LError) // Only Error and above
+	stop := drainClient(c)
+	defer stop()
+	defer c.Destroy()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Debug("this message will be filtered")
+	}
+}

log/log_test.go

@@ -2,7 +2,6 @@ package log
 
 import (
 	"strconv"
-	"sync"
 	"testing"
 )
 
@@ -37,21 +36,6 @@ func TestSetLogLevel(t *testing.T) {
 	c.Destroy()
 }
 
-func BenchmarkDebugSerial(b *testing.B) {
-	c := CreateClient("test")
-	var x sync.WaitGroup
-	x.Add(b.N)
-	for i := 0; i < b.N; i++ {
-		Debug(i)
-		go func() {
-			c.Get()
-			x.Done()
-		}()
-	}
-	x.Wait()
-	c.Destroy()
-}
-
 // Trace ensure logs come out in the right order
 func TestOrder(t *testing.T) {
 	testString := "Testing trace: "