I have noticed that when using the sage0 interface zombie processes remain
even after running the sage.interfaces.quit.expect_quitall function.
Is this a bug? Is there some way to migrate this?
Here is an example of what I am talking about. Here is the content of the
file zombie_test.sage
import sage.interfaces.sage0
import sage.interfaces.quit
def create_new_instances():
s = sage.interfaces.sage0.Sage()
s('4')
del s
print "Create instances"
create_new_instances()
raw_input('continue?')
print "Run expect_quit"
sage.interfaces.quit.expect_quitall(verbose=True)
raw_input('continue?')
After running the create_new_instances() function the relevant part of the
process tree looks like this.
| | | `-bash,7619 /usr/lib/sagemath/local/bin/sage-python
zombie_test.sage.py
| | | |-python,7661 /usr/lib/sagemath/local/bin/sage-cleaner
| | | `-python,7663 zombie_test.sage.py
| | | |-python,7668
/usr/lib/sagemath/local/bin/sage-ipython
--HistoryManager.hist_file=:memory: ...
| | | `-(python,7669)
But process 7669 is a zombie!
PID TTY STAT TIME COMMAND
7669 pts/6 Z 0:00 [python] <defunct>
Next running sage.interfaces.quit.expect_quitall outputs
Exiting Sage with PID 7668 running /usr/lib/sagemath/local/bin/sage-ipython
--HistoryManager.hist_file=:memory: --colors=NoColor
Indeed process 7668 has been removed but process 7669 remains and the
process tree looks like this:
| | | `-bash,7619 /usr/lib/sagemath/local/bin/sage-python
zombie_test.sage.py
| | | |-python,7661 /usr/lib/sagemath/local/bin/sage-cleaner
| | | `-python,7663 zombie_test.sage.py
| | | |-(python,7668)
| | | |-(python,7669)
| | | `-python,7701 zombie_test.sage.py
In my work I'm running a long executing program and these zombie processes
are annoying.
Finally some info about my setup:
Sage Version 6.9, Release Date: 2015-10-10
Ubuntu MATE 15.10
Linux kernel 4.2.0-27-generic
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