write memory profiles every 30 seconds when enabled

cmd/ipfs/main.go

@@ -447,15 +447,19 @@ func startProfiling() (func(), error) {
 		return nil, err
 	}
 	pprof.StartCPUProfile(ofi)
-
-	stopProfiling := func() {
-		pprof.StopCPUProfile()
-		defer ofi.Close() // captured by the closure
+	go func() {
+		for _ = range time.NewTicker(time.Second * 30).C {
 			err := writeHeapProfileToFile()
 			if err != nil {
 				log.Critical(err)
 			}
 		}
+	}()
+
+	stopProfiling := func() {
+		pprof.StopCPUProfile()
+		defer ofi.Close() // captured by the closure
+	}
 	return stopProfiling, nil
 }
 
@@ -487,7 +491,6 @@ func (ih *IntrHandler) Close() error {
 	return nil
 }
 
-
 // Handle starts handling the given signals, and will call the handler
 // callback function each time a signal is catched. The function is passed
 // the number of times the handler has been triggered in total, as