fix windows rlimit

cmd/io.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"sync"
-	"syscall"
 )
 
 // IOGroup wraps a WaitGroup with an additional rate-limit interface.
@@ -38,15 +37,6 @@ func NewIOGroup() IOGroup {
 	return &ioGroup{limit: limit, wg: wg, limiter: limiter}
 }
 
-func checkLimit() int {
-	var rlimit syscall.Rlimit
-	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit)
-	if err != nil {
-		return 50 // true random
-	}
-	return int(rlimit.Cur)
-}
-
 type ioGroup struct {
 	limit   int
 	wg      *sync.WaitGroup

cmd/limit_others.go

@@ -0,0 +1,14 @@
+// +build !windows
+
+package cmd
+
+import "syscall"
+
+func checkLimit() int {
+	var rlimit syscall.Rlimit
+	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit)
+	if err != nil {
+		return 50 // true random
+	}
+	return int(rlimit.Cur)
+}

cmd/limit_windows.go

@@ -0,0 +1,5 @@
+package cmd
+
+func checkLimit() int {
+	return 50 // oy windows
+}