Re-introduce debugging prints for memory use

channel.go

@@ -26,6 +26,7 @@ import (
 	"net"
 	"os"
 	"path/filepath"
+	"runtime"
 	"sync"
 	"time"
 
@@ -685,6 +686,11 @@ func (ch *Channel) onClosed() {
 		ch.log.Info("Timer wheel stopped.")
 	}
 	ch.log.Info("Channel closed.")
+	// FIXME
+	const mebibyte = 1048576
+	m := runtime.MemStats{}
+	runtime.ReadMemStats(&m)
+	fmt.Printf("SYSTEM MEMORY: %v MiB\n", m.Sys/mebibyte)
 }
 
 // Closed returns whether this channel has been closed with .Close()