fine tune for starting and stopping
fine tune for starting and stopping

shilad/ps-lite,toothacher17/ps-lite,xcgoner/ps-lite-new,yuanxiaolong/ps-lite,yuanxiaolong/ps-lite,xcgoner/ps-lite-new,xcgoner/ps-lite-new,dmlc/ps-lite,xindaya/ps-lite,dmlc/ps-lite,shilad/ps-lite,xindaya/ps-lite,xcgoner/ps-lite-new,dmlc/ps-lite,shilad/ps-lite,toothacher17/ps-lite,dmlc/ps-lite