[IPython-dev] Two frontends, one kernel

Doug Blank doug.blank at gmail.com
Thu May 1 12:58:12 EDT 2014

Devs, I have been trying to find the cause of this bug for some time, and I
thought that someone might be able to provide a hint as to where to look to
find the issue.

We have an external kernel that works very well when you connect onto it
with a single frontend. But when you connect two frontends (console or
notebook), then the conversation gets confused.

More detail:

Terminal 1:

ipython console --profile calico

works fine.

Terminal 2:

ipython console --profile calico --existing

starts, but now things are confused. Now, each terminal takes turns being
able to get the prompt. If run in notebook, then code execution never
signals the end of computing (the [*] never turns to a number, but you can
still enter and get results back). In the console, output is received, but
the prompt is in the other terminal.

It works fine with a single front end.

Any ideas appreciated!

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