go test (no udp limit)

scripts/go/README.md

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+# Go UDP Receiver - High-Performance UDP Testing Tool
+
+A high-performance Go implementation for testing UDP reception performance. This version focuses purely on UDP performance without any GUI/display components, making it ideal for benchmarking network throughput and detecting dropped frames.
+
+## Features
+
+- **Pure UDP Performance**: No GUI overhead, focuses on network performance
+- **High Throughput**: Go's native performance handles 200+ fps easily
+- **Low Latency**: Dedicated goroutine for UDP reception
+- **Drop Detection**: Tracks and reports dropped frames based on timing
+- **Bandwidth Monitoring**: Real-time bandwidth usage statistics
+- **Clean Output**: Console-based statistics ideal for logging and analysis
+
+## Prerequisites
+
+- **Go 1.21+**: Download from https://go.dev/dl/
+- **No other dependencies**: Pure Go implementation using only standard library
+
+## Building
+
+### Windows (PowerShell)
+
+```powershell
+# From project root
+.\scripts\build_go_receiver.ps1
+
+# Or manually from scripts/go directory
+cd scripts\go
+go build -o recv_raw_rolling.exe main.go
+```
+
+### Linux/macOS
+
+```bash
+# From project root
+./scripts/build_go_receiver.sh
+
+# Or manually from scripts/go directory
+cd scripts/go
+go build -o recv_raw_rolling main.go
+```
+
+## Running
+
+```bash
+# Windows
+cd scripts\go
+.\recv_raw_rolling.exe
+
+# Linux/macOS
+cd scripts/go
+./recv_raw_rolling
+```
+
+Press `Ctrl+C` to stop and display final statistics.
+
+## Configuration
+
+Edit the constants in [`main.go`](main.go:13) to match your setup:
+
+- `COLUMN_WIDTH`: Width of incoming data (default: 4)
+- `COLUMN_HEIGHT`: Height of incoming data (default: 2456)
+- `CHANNELS`: Number of color channels (default: 3 for RGB)
+- `UDP_PORT`: UDP port to listen on (default: 5000)
+- `EXPECTED_FPS`: Expected frame rate for drop detection (default: 200)
+
+## Output
+
+The receiver displays statistics every 100 frames:
+
+```
+Frame    100: Real FPS:  198.5 | Instant:  200.2 | BW:  34.56 MB/s
+Frame    200: Real FPS:  199.1 | Instant:  199.8 | BW:  34.62 MB/s
+Frame    300: Real FPS:  199.8 | Instant:  200.1 | BW:  34.59 MB/s | ⚠️  2 drops
+```
+
+On shutdown (Ctrl+C), it displays final statistics:
+
+```
+=== Final Statistics ===
+Total Frames: 1234
+Total Time: 6.17 seconds
+Average FPS: 200.0
+Instant FPS: 199.8
+Total Drops: 5
+Total Data: 35.67 MB
+Bandwidth: 34.58 MB/s
+```
+
+## Performance Comparison
+
+| Implementation | Typical FPS | CPU Usage | Overhead |
+|---------------|-------------|-----------|----------|
+| Python (OpenCV) | ~100 fps | High | Display rendering |
+| **Go (Console)** | **200+ fps** | **Minimal** | **None** |
+
+## Use Cases
+
+- **UDP Performance Testing**: Measure maximum UDP throughput
+- **Network Diagnostics**: Detect packet loss and timing issues
+- **Benchmarking**: Compare network setups and configurations
+- **Automated Testing**: Console output suitable for CI/CD pipelines
+- **High-Speed Data Acquisition**: Validate 200+ fps data streams
+
+## Technical Details
+
+- **Concurrent UDP Reception**: Dedicated goroutine prevents frame drops
+- **16MB Receive Buffer**: Configured for high-throughput scenarios
+- **Zero Display Overhead**: Pure console output for maximum performance
+- **Graceful Shutdown**: Handles Ctrl+C and displays final statistics
+- **No External Dependencies**: Pure Go standard library
+
+## Troubleshooting
+
+### Build Errors
+
+Ensure you have Go 1.21+ installed:
+```bash
+go version
+```
+
+### Port Already in Use
+
+If port 5000 is in use, edit `UDP_PORT` in [`main.go`](main.go:31) and rebuild.
+
+### High Drop Rate
+
+1. Check network configuration with [`scripts/udp_optimize.ps1`](../udp_optimize.ps1) (Windows)
+2. Verify sender is transmitting at correct rate
+3. Check for network congestion or interference
+4. Consider increasing receive buffer size in code
+
+## Comparison with Python Version
+
+The Python version ([`scripts/recv_raw_rolling.py`](../recv_raw_rolling.py)) includes visual display but has lower throughput:
+
+- **Use Go version for**: Performance testing, benchmarking, headless servers
+- **Use Python version for**: Visual debugging, development, seeing actual data
+
+## Changes from Previous Version
+
+This version has been simplified to focus purely on UDP performance:
+
+- ✅ Removed SDL2 dependency
+- ✅ Removed GUI/display components  
+- ✅ Added comprehensive statistics
+- ✅ Improved drop detection
+- ✅ Added bandwidth monitoring
+- ✅ Zero external dependencies

scripts/go/go.mod

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+module recv_raw_rolling
+
+go 1.21

scripts/go/main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+const (
+	// Stream parameters (match your GStreamer sender)
+	COLUMN_WIDTH  = 4
+	COLUMN_HEIGHT = 2456
+	CHANNELS      = 3
+	FRAME_SIZE    = COLUMN_WIDTH * COLUMN_HEIGHT * CHANNELS // 29472 bytes
+
+	// Line drop detection parameters
+	EXPECTED_FPS         = 200
+	EXPECTED_INTERVAL_MS = 1000.0 / EXPECTED_FPS // 5ms for 200fps
+	DROP_THRESHOLD_MS    = EXPECTED_INTERVAL_MS * 2.5
+	STATS_WINDOW_SIZE    = 100
+	STATUS_INTERVAL      = 100
+
+	UDP_PORT = 5000
+)
+
+type FrameStats struct {
+	intervals      []float64
+	totalDrops     int
+	dropsSince     int
+	frameCount     int
+	firstFrameTime time.Time
+	lastFrameTime  time.Time
+	totalBytes     int64
+}
+
+func newFrameStats() *FrameStats {
+	return &FrameStats{
+		intervals: make([]float64, 0, STATS_WINDOW_SIZE),
+	}
+}
+
+func (fs *FrameStats) addInterval(intervalMs float64) {
+	if len(fs.intervals) >= STATS_WINDOW_SIZE {
+		fs.intervals = fs.intervals[1:]
+	}
+	fs.intervals = append(fs.intervals, intervalMs)
+}
+
+func (fs *FrameStats) avgInterval() float64 {
+	if len(fs.intervals) == 0 {
+		return 0
+	}
+	sum := 0.0
+	for _, v := range fs.intervals {
+		sum += v
+	}
+	return sum / float64(len(fs.intervals))
+}
+
+func (fs *FrameStats) printSummary() {
+	if fs.frameCount == 0 {
+		return
+	}
+	elapsed := time.Since(fs.firstFrameTime).Seconds()
+	avgFPS := float64(fs.frameCount) / elapsed
+	avgInterval := fs.avgInterval()
+	instantFPS := 0.0
+	if avgInterval > 0 {
+		instantFPS = 1000.0 / avgInterval
+	}
+	
+	bandwidth := float64(fs.totalBytes) / elapsed / (1024 * 1024) // MB/s
+	
+	fmt.Println("\n=== Final Statistics ===")
+	fmt.Printf("Total Frames: %d\n", fs.frameCount)
+	fmt.Printf("Total Time: %.2f seconds\n", elapsed)
+	fmt.Printf("Average FPS: %.2f\n", avgFPS)
+	fmt.Printf("Instant FPS: %.2f\n", instantFPS)
+	fmt.Printf("Total Drops: %d\n", fs.totalDrops)
+	fmt.Printf("Total Data: %.2f MB\n", float64(fs.totalBytes)/(1024*1024))
+	fmt.Printf("Bandwidth: %.2f MB/s\n", bandwidth)
+}
+
+func main() {
+	// Setup UDP socket
+	addr := net.UDPAddr{
+		Port: UDP_PORT,
+		IP:   net.ParseIP("0.0.0.0"),
+	}
+	conn, err := net.ListenUDP("udp", &addr)
+	if err != nil {
+		log.Fatal("UDP listen failed:", err)
+	}
+	defer conn.Close()
+
+	// Set receive buffer size to 16MB
+	if err := conn.SetReadBuffer(16 * 1024 * 1024); err != nil {
+		log.Printf("Warning: Failed to set recv buffer: %v", err)
+	}
+
+	fmt.Printf("High-Performance UDP Receiver for Raw %dx%d RGB columns\n", COLUMN_WIDTH, COLUMN_HEIGHT)
+	fmt.Printf("Listening on UDP port %d\n", UDP_PORT)
+	fmt.Printf("Expected frame size: %d bytes\n", FRAME_SIZE)
+	fmt.Printf("Press Ctrl+C to stop\n\n")
+
+	stats := newFrameStats()
+	buffer := make([]byte, 65536)
+
+	// Handle graceful shutdown
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
+	
+	// Channel for shutdown
+	done := make(chan bool)
+	
+	// Start UDP receiver goroutine
+	go func() {
+		for {
+			select {
+			case <-done:
+				return
+			default:
+				n, _, err := conn.ReadFromUDP(buffer)
+				if err != nil {
+					select {
+					case <-done:
+						return
+					default:
+						log.Printf("UDP read error: %v", err)
+						continue
+					}
+				}
+
+				if n != FRAME_SIZE {
+					// Wrong packet size, skip
+					continue
+				}
+
+				currentTime := time.Now()
+
+				// Initialize timing on first frame
+				if stats.firstFrameTime.IsZero() {
+					stats.firstFrameTime = currentTime
+					fmt.Println("Started receiving frames...")
+				}
+
+				// Line drop detection
+				if !stats.lastFrameTime.IsZero() {
+					intervalMs := float64(currentTime.Sub(stats.lastFrameTime).Microseconds()) / 1000.0
+					stats.addInterval(intervalMs)
+
+					if intervalMs > DROP_THRESHOLD_MS {
+						stats.totalDrops++
+						stats.dropsSince++
+					}
+				}
+
+				stats.lastFrameTime = currentTime
+				stats.frameCount++
+				stats.totalBytes += int64(n)
+
+				// Print status
+				if stats.frameCount%STATUS_INTERVAL == 0 {
+					elapsed := currentTime.Sub(stats.firstFrameTime).Seconds()
+					realFPS := float64(stats.frameCount) / elapsed
+					avgInterval := stats.avgInterval()
+					instantFPS := 0.0
+					if avgInterval > 0 {
+						instantFPS = 1000.0 / avgInterval
+					}
+
+					bandwidth := float64(stats.totalBytes) / elapsed / (1024 * 1024) // MB/s
+
+					status := fmt.Sprintf("Frame %6d: Real FPS: %6.1f | Instant: %6.1f | BW: %6.2f MB/s",
+						stats.frameCount, realFPS, instantFPS, bandwidth)
+					if stats.dropsSince > 0 {
+						status += fmt.Sprintf(" | ⚠️  %d drops", stats.dropsSince)
+						stats.dropsSince = 0
+					} else if stats.totalDrops > 0 {
+						status += fmt.Sprintf(" | Total drops: %d", stats.totalDrops)
+					}
+					fmt.Println(status)
+				}
+			}
+		}
+	}()
+
+	// Wait for shutdown signal
+	<-sigChan
+	fmt.Println("\nShutdown signal received...")
+	close(done)
+	
+	// Give a moment for cleanup
+	time.Sleep(100 * time.Millisecond)
+	
+	// Print final statistics
+	stats.printSummary()
+	fmt.Println("Goodbye!")
+}