Increase in-process max open files limit

main.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"runtime"
+	"syscall"
 	"time"
 )
 
@@ -32,6 +33,10 @@ func main() {
 		return
 	}
 
+	if err := increaseResourceLimits(); err != nil {
+		log.Fatalf("Couldn't increase resource limits: %s", err)
+	}
+
 	// Validate rate argument
 	if *rate == 0 {
 		log.Fatal("rate can't be zero")
@@ -102,3 +107,11 @@ func attack(targets Targets, ordering string, rate uint, duration time.Duration,
 		rep.Add(<-responses)
 	}
 }
+
+func increaseResourceLimits() error {
+	limit := &syscall.Rlimit{Cur: syscall.RLIM_INFINITY}
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, limit); err != nil {
+		return err
+	}
+	return nil
+}