问题

ipython无法启动：

  • 无法使用remote debugger，表现为在ipython console中一输入命令就卡死。而后尝试单独用ipython/ipdb，发现症状类似，同样是输入ipython就会卡死
  • 细查进程，发现一旦在ipython console开始输入命令后，就从原来的SL+变成了DL+
  • ipython --log-version=DEBUG发现卡死在搜索config中

image-20210113111830260

原因

参考 ipython won’t start

NFS文件系统挂载目录发生了变化，导致默认的sqlite无法使用。

#  By default, IPython will put the history database in the IPython profile
#  directory.  If you would rather share one history among profiles, you can set
#  this value in each, so that they are consistent.
#
#  Due to an issue with fcntl, SQLite is known to misbehave on some NFS mounts.
#  If you see IPython hanging, try setting this to something on a local disk,
#  e.g::
#
#      ipython --HistoryManager.hist_file=/tmp/ipython_hist.sqlite

解决方法

  1. 通过ipython create profile在~/.ipython/profile_default下创建两个config python脚本：ipython_config.py 和ipython_kernel_config.py
  2. 修改ipython_config.py中的c.HistoryAccessor.hist_file为有效的目录，比如按照注释中的/tmp/ipython_hist.sqlite（**推荐：由于NFS存在问题，因此最好在/tmp目录下创建属于自己的sqlite，比如/tmp/xiaoming_ipython_hist.sqlite**）：
c.HistoryAccessor.hist_file = '/tmp/ipython_hist.sqlite'

PS

修改ipython默认的configure files

参考 Setting iPython default profile

最简单的方法是直接修改profile_default中的文件，或者启动时指定profile：--profile=testing

Take a backup of profile_default and then rename profile_testing to profile_default.

Or you can copy the contents of profile_testing to profile_default.

jupyter notebook有类似的hanging的问题

原因和ipython hanging的原因一样，因此解决方法类似：

  1. 如果没有config文件， 首先通过jupyter notebook --generate-config
  2. 然后在~/.jupyter下找到jupyter_notebook_config.py，然后编辑其中的NotebookNotary.db_fileUnicode选项

NotebookNotary.db_fileUnicode

Default: ''

The sqlite file in which to store notebook signatures. By default, this will be in your Jupyter data directory. You can set it to ‘:memory:’ to disable sqlite writing to the filesystem.

## The sqlite file in which to store notebook signatures. By default, this will
#  be in your Jupyter data directory. You can set it to ':memory:' to disable
#  sqlite writing to the filesystem.
c.NotebookNotary.db_file = '/tmp/weitaotang_jupyter.sqlite'
#c.NotebookNotary.db_file = ''