Jetson Nano上jtop（jetson_stats.service）不能运行

刚拿到的Jetson Nano开发板上，jtop指令无法运行，

~$ jtop
I can't access jetson_stats.service.
Please logout or reboot this board.

顺便查了一下nvcc和tensorrt，正常，

~$ nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2021 NVIDIA Corporation
Built on Sun_Feb_28_22:34:44_PST_2021
Cuda compilation tools, release 10.2, V10.2.300
Build cuda_10.2_r440.TC440_70.29663091_0

~$ dpkg -l tensorrt
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
ii  tensorrt       8.0.1.6-1+cu arm64        Meta package of TensorRT

一时半会也没个头绪，重启系统，无效；然后重启了一下jetson_stats.service，

sudo systemctl restart jetson_stats.service

输入密码，无效，然后就没有然后了；

硬着头皮，把jetson_stats重新安装了一下，根据官网：

https://pypi.org/project/jetson-stats/

Install
sudo -H pip install -U jetson-stats
🚀 That's it! 🚀

PS: Don't forget to reboot your board

安装过程如下，

~$ sudo -H pip install -U jetson-stats
[sudo] password for hiwonder: 
Requirement already satisfied: jetson-stats in /usr/local/lib/python3.6/dist-packages (3.1.1)
Collecting jetson-stats
  Downloading jetson-stats-3.1.4.tar.gz (85 kB)
     |████████████████████████████████| 85 kB 246 kB/s 
Building wheels for collected packages: jetson-stats
  Building wheel for jetson-stats (setup.py) ... \

done
  Created wheel for jetson-stats: filename=jetson_stats-3.1.4-py3-none-any.whl size=113477 sha256=25dfb2c83ddec3d5096ff0b9f4ba97d54b6278089448cac73a10d58d0f307738
  Stored in directory: /root/.cache/pip/wheels/91/de/fb/c3d02bc69291926b5337e3f611048bfd34520502724a68551d
Successfully built jetson-stats
Installing collected packages: jetson-stats
  Attempting uninstall: jetson-stats
    Found existing installation: jetson-stats 3.1.1
    Uninstalling jetson-stats-3.1.1:
      Successfully uninstalled jetson-stats-3.1.1
Successfully installed jetson-stats-3.1.4
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.

然后再跑jtop指令，还是不行，
~$ jtop
The jetson_stats.service is not active. Please run:
sudo systemctl restart jetson_stats.service
hiwonder@JetMax:~$ sudo systemctl restart jetson_stats.service
hiwonder@JetMax:~$ jtop
I can't access jetson_stats.service.
Please logout or reboot this board.

不过官网说了必须重启系统，所以赶紧reboot一下。

重启之后，发现jtop可以正常运行了，如下，

到最后，也没弄明白为什么jetson-stats-3.1.1不能运行，而jetson-stats-3.1.４能正常运行。

本文结束。