原因是运行python结束时，用的ctrl+c不太行，尝试Ctrl+z,发现有时候管用。后面htop一看内存似乎没有释放掉。
总结
针对处在 Tl 状态的进程，用 kill 进程号 没用，内存没有释放掉、进程没有关掉。 用 kill -CONT 进程号 解决，原理是发现 SIGCONT 信号，激活进程，然后就可以关掉了，内存也释放掉了
原因记录
$ python main.py
DEBUG init
environment arge : {'map_name': 'jinan-1', 'seed': 6, 'thread_num': 15, 'eight_phase': True, 'min_action_time': 15, 'list_state_feature': ['cur_phase', 'lane_accumulate_waiting_time'], 'dic_reward_info': {'accumulate_waiting_time': -0.25}}
DEBUG SummaryWriter done
DEBUG Learner done
DEBUG Controller done
DEBUG Runner done
^C^Z
[1]+ Stopped python main.py
$ python main.py
DEBUG init
environment arge : {'map_name': 'jinan-1', 'seed': 6, 'thread_num': 15, 'eight_phase': True, 'min_action_time': 15, 'list_state_feature': ['cur_phase', 'lane_accumulate_waiting_time'], 'dic_reward_info': {'accumulate_waiting_time': -0.25}}
DEBUG Runner done
^C^Z
[2]+ Stopped python main.py
解决过程
$ ps aux | grep xiaomi | grep python # 查找xiaomi的 python 进程
xiaomi 245450 108 0.1 13881632 1920968 pts/45 Sl+ 09:31 322:14 python train.py
xiaomi 403867 52.0 12.8 937281396 135541744 pts/202 Tl 14:25 1:06 python main.py
xiaomi 404726 136 16.5 937280492 175097972 pts/202 Tl 14:26 1:25 python main.py
xiaomi 405685 0.0 0.0 17688 648 pts/202 S+ 14:27 0:00 grep --color=auto python
$ kill 403867
$ ps aux | grep xiaomi | grep python # 进程 403867 还在
xiaomi 245450 108 0.1 13881632 1920968 pts/45 Sl+ 09:31 322:32 python train.py
xiaomi 403867 46.2 12.8 937281396 135541744 pts/202 Tl 14:25 1:06 python main.py
xiaomi 404726 108 16.5 937280492 175097972 pts/202 Tl 14:26 1:25 python main.py
xiaomi 405904 0.0 0.0 17688 712 pts/202 S+ 14:27 0:00 grep --color=auto python
$ kill 404726
$ ps aux | grep xiaomi | grep python
xiaomi 245450 108 0.1 13881632 1920968 pts/45 Rl+ 09:31 323:18 python train.py
xiaomi 403867 35.5 12.8 937281396 135541744 pts/202 Tl 14:25 1:06 python main.py
xiaomi 404726 70.4 16.5 937280492 175097972 pts/202 Tl 14:26 1:25 python main.py
xiaomi 406374 0.0 0.0 17688 708 pts/202 S+ 14:28 0:00 grep --color=auto python
$ kill -CONT 404726
$ ps aux | grep xiaomi | grep python # 进程 404726 已经关掉
[2]- Terminated python main.py
xiaomi 245450 108 0.1 13881376 1920712 pts/45 Rl+ 09:31 328:37 python train.py
xiaomi 403867 13.8 12.8 937281396 135541744 pts/202 Tl 14:25 1:06 python main.py
xiaomi 410292 0.0 0.0 17688 660 pts/202 S+ 14:33 0:00 grep --color=auto python
$ kill -CONT 403867
$ ps aux | grep xiaomi | grep python
[1]+ Terminated python main.py
xiaomi 245450 108 0.1 13879840 1919176 pts/45 Rl+ 09:31 332:42 python train.py
xiaomi 412742 0.0 0.0 17688 716 pts/202 S+ 14:37 0:00 grep --color=auto python