message: pcm-memory: display system metrics only once per sample
diff: @@ -411,6 +411,8 @@ void display_bandwidth(PCM *m, memdata_t *md, uint32 no_columns, const bool show
  skt += 1;
  }
  }
  + }
  + {
  cout << "\
  \r|---------------------------------------||---------------------------------------|\n";
  if(md->PMM)
  