Ipython Hanging

[predragp at andrew.cmu.edu]

I have multiple reports that ipython27 in hanging on neill computational
nodes. I just mounted zfsauton home on neill1 and tested ipython27 with my
regular user account. Everything worked perfectly. At the same time I have
no doubt that neither Ed or Sriram are trying to pull a prank on me.

Typically UNIX process will appear to hang due to two principal reasons.
One is that is busy in some kind run off infinite loop which never gets
terminated or due to the fact that resources are not available.

If you have no problem reading and writing in your home account than file
system is available (I am in the process of tuning NFS mount so that we
get much better performance from the current) than other resources should
not be a problem. Ipython should not hang due to the lock file but it
doesn't hurt that you guys check .ipython in home directory. Try killing
ipython processes

pgrep ipython27|xargs kill -9


or for that matter all python processes. It will take me some time to do
strace and lsof. As a mater of the last resort I am sure that reboot
should clear the problems but I don't want to reboot servers at this
point.

PRedrag




> Hey Predrag,
>
> When I try to run ipython27 on the servers it just hangs. I try ctrl-C, it
> shows ^C on the screen but the program continues to hang. Is there a
> reason why ipython is no longer responsive.
>
> Ed


> Hey Predrag,
>
> Ipython seems be hanging on the neill servers. Forget about ipython
> notebook using x2go servers, but just pure terminal based ipython27 is
> also hanging.
>
> Do you know something that happened recently that created this issue?
>
> Thanks for the help!
>
> -Sriram
>