attaching debugger to runinng python program

[alf]

Hi,

I have a two fold question:
-how to attach the debugger to running multi threaded program
-the objective is to find an infinite loop in one of threads which
makes the whole thingy going craze (100%CPU)

The program itself is not easy, in fact quite hude and sometimes it
takes hours to get to that infloop state.

Any insight?

Andy

[Bill Pursell]

Re: attaching debugger to runinng python program


alf wrote:

Hi,
>
I have a two fold question:
-how to attach the debugger to running multi threaded program
-the objective is to find an infinite loop in one of threads which
makes the whole thingy going craze (100%CPU)
>
The program itself is not easy, in fact quite hude and sometimes it
takes hours to get to that infloop state.

On linux:

% python

>>import os
>>os.getpid()

54321

Now, in another shell,
% gdb
(gdb) attach 54321

If you want debugging symbols, recompile python with -g.

[alf]

Re: attaching debugger to runinng python program

Bill Pursell wrote:

Now, in another shell,
% gdb
(gdb) attach 54321
>

Thx for the reply. But I wish to debug the python program, not python
interpreter itself.

[olsongt@verizon.net]

Re: attaching debugger to runinng python program


alf wrote:

Bill Pursell wrote:

Now, in another shell,
% gdb
(gdb) attach 54321

>
Thx for the reply. But I wish to debug the python program, not python
interpreter itself.

I haven't used this, but it looks like it's worth a try:

http://hapdebugger.sourceforge.net/

[Nebur]

Re: attaching debugger to runinng python program

You may try winpdb.
I find it to be a comfortable debugger that also can attach to running
programs. (You need to add a line in your code where the program should
stop and wait for the debugger to attach.)
I am satisfied with it, but I did not debug a multi theaded app.
However, it can handle threads. I'd be glad to later hear whether it
did what you need, or not:

http://www.digitalpeers.com/pythondebugger/threads.htm

Regards, Ruben