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Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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Last 100 entries

Debugging A Hung (Spinning) Python Process

From: andrew cooke <andrew@...>

Date: Mon, 31 May 2010 09:46:01 -0400

I left a Python script running at the client's, overnight, expecting
everything to be ready in the morning.  But when I checked next day the CPU
was pegged at 100% and the log indicated no progress since 1am.  Clearly the
Python code had a bug and was "spinning" in a tight loop.

The problem, then, was to find out what code was being executed.  Luckily
there's a very neat solution, that I've used before, that does exactly this.
It's described in an answer by "spiv" at
http://stackoverflow.com/questions/132058/getting-stack-trace-from-a-running-python-application

That describes how to connect gdb to the process ("gdb -p PID") and dump a
Python stack trace ("pystack").  All that you need to do is create a .gdbinit
file with the contents given here -
http://svn.python.org/projects/python/trunk/Misc/gdbinit

With a stack trace it was easy to see the error in my code - and it was a
tight loop, and it depended explicitly on the time of day, which is why I had
not seen it before. :o)

Andrew

Update

From: andrew cooke <andrew@...>

Date: Thu, 31 May 2018 21:16:09 -0400

This is now simpler.

You need to follow the instructions at
https://devguide.python.org/gdb/ - basically put

  add-auto-load-safe-path /path/to/checkout

in ~/.gdbinit

Then connect with gdb -p PID and use the commands described in the
link.

There is one extra step for VMs.  You need to link the python-dgb.py
in the checkout directory to the bin directory for the virtualenv, and
the name MUST MATCH the python in use (so python-3.5, if used, not
simply python)

For example, ths worked for me:

  ln -s /home/andrew/pkg/Python-3.5.1/python-gdb.py env/bin/python3.5-gdb.py

Andrew

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From: Tina <freight@...>

Date: Fri, 5 Jul 2024 10:43:55 +0800 (GMT+08:00)

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From: Tina <freight@...>

Date: Tue, 9 Jul 2024 11:47:55 +0800 (GMT+08:00)

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From: Tina <freight@...>

Date: Thu, 8 Aug 2024 20:46:11 +0800 (GMT+08:00)

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From: Tina <freight@...>

Date: Mon, 12 Aug 2024 14:39:22 +0800 (GMT+08:00)

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