Created
April 11, 2024 15:09
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package main | |
import ( | |
"fmt" | |
"net" | |
"os" | |
"sort" | |
"time" | |
) | |
func main() { | |
if len(os.Args) != 3 { | |
fmt.Fprintf(os.Stderr, "Usage: %s <host:port> <number_of_packets>\n", os.Args[0]) | |
os.Exit(1) | |
} | |
serverAddr := os.Args[1] | |
numPackets := 10 // Default number of packets | |
fmt.Sscanf(os.Args[2], "%d", &numPackets) // Parse the desired number of packets from command line | |
addr, err := net.ResolveUDPAddr("udp", serverAddr) | |
if err != nil { | |
fmt.Println("Error resolving UDP address:", err) | |
os.Exit(1) | |
} | |
conn, err := net.DialUDP("udp", nil, addr) | |
if err != nil { | |
fmt.Println("Error dialing UDP:", err) | |
os.Exit(1) | |
} | |
defer conn.Close() | |
// Slice to store latencies and a slice to track jitter between packets | |
latencies := make([]time.Duration, 0, numPackets) | |
jitters := make([]time.Duration, 0, numPackets-1) | |
var lastLatency time.Duration | |
for i := 0; i < numPackets; i++ { | |
startTime := time.Now() | |
_, err = conn.Write([]byte("ping")) | |
if err != nil { | |
fmt.Println("Error sending data:", err) | |
continue | |
} | |
buffer := make([]byte, 1024) | |
conn.SetReadDeadline(time.Now().Add(1 * time.Second)) // 1 second timeout for the echo | |
_, _, err = conn.ReadFrom(buffer) | |
if err != nil { | |
fmt.Println("Error reading from server:", err) | |
continue | |
} | |
endTime := time.Now() | |
latency := endTime.Sub(startTime) | |
latencies = append(latencies, latency) | |
// Calculate and store jitter | |
if i > 0 { | |
jitter := latency - lastLatency | |
if jitter < 0 { | |
jitter = -jitter | |
} | |
jitters = append(jitters, jitter) | |
} | |
lastLatency = latency | |
fmt.Printf("Packet %d RTT: %v\n", i+1, latency) | |
} | |
// Sort latencies to calculate percentiles | |
sort.Slice(latencies, func(i, j int) bool { | |
return latencies[i] < latencies[j] | |
}) | |
minLatency := latencies[0] | |
maxLatency := latencies[len(latencies)-1] | |
p50 := latencies[len(latencies)*50/100] | |
p95 := latencies[len(latencies)*95/100] | |
p99 := latencies[len(latencies)*99/100] | |
// Calculate average jitter | |
var totalJitter time.Duration | |
for _, jitter := range jitters { | |
totalJitter += jitter | |
} | |
averageJitter := totalJitter / time.Duration(len(jitters)) | |
fmt.Printf("Min RTT: %v\n", minLatency) | |
fmt.Printf("P50 RTT: %v\n", p50) | |
fmt.Printf("P95 RTT: %v\n", p95) | |
fmt.Printf("P99 RTT: %v\n", p99) | |
fmt.Printf("Max RTT: %v\n", maxLatency) | |
fmt.Printf("Average Jitter: %v\n", averageJitter) | |
} |
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