[IPython-User] Debug code on ipengine in IDE

[Darren Govoni]

Nice! And I'm sure the debugger will do its own context switching if or
when any user threads come into play as well - complete with call
stacks. In fact, I can jump back in the call stack in my debugger and
inspect a prior context, then resume normal execution. Definitely cool
within the scope of ipython parallel tasks execution. Very easy to debug
client side AND engine side at once.

On Fri, 2012-06-08 at 21:54 +0000, Jon Olav Vik wrote:
> Darren Govoni <darren <at> ontrenet.com> writes:
> 
> > Incidentally, I discovered that I can execute the ipengine code directly
> > in my python IDE and set break points in my user code modules and when I
> > execute functions from remote clients/views, it will hit the break
> > points and let me debug my code visually (in the running engine). Pretty
> > sweet. Though I'd share.
> 
> Brilliant! This works in Eclipse PyDev on Windows too. What I did:
> 
> 1. Create an Eclipse project for the c:\python27\scripts folder.
> 2. Run "ipcluster start --n=0", e.g. in a command window.
> 3. In Eclipse, open the code you want to debug and set a breakpoint there.
> 4. In your "scripts" Eclipse project, open ipengine-script.py and "debug as 
> python run".
> 5. Run some code that uses IPython.parallel.Client().
> 
> In the example below,
> cell.py is my main script.
> It creates a Client() 
> which parallelizes cell.py:do(), 
> which calls task.py:pace().
> 
> The "debug" tab in Eclipse shows an impressive call stack:
> 
> scripts ipengine-script.py [Python Run]	
> 	ipengine-script.py	
> 		MainThread - pid6940_seq2	
> 			pace [task.py:26]	
> 			do [cell.py:54]	
> 			<module> [<string>:1]	
> 			apply_request [streamkernel.py:337]	
> 			dispatch_queue [streamkernel.py:399]	
> 			dispatcher [streamkernel.py:408]	
> 			_run_callback [zmqstream.py:365]	
> 			_handle_recv [zmqstream.py:424]	
> 			_handle_events [zmqstream.py:391]	
> 			start [ioloop.py:330]	
> 			start [ipengineapp.py:316]	
> 			launch_new_instance [ipengineapp.py:325]	
> 			<module> [ipengine-script.py:9]	
> 			run [pydevd.py:1060]	
> 			<module> [pydevd.py:1346]	
> 		Thread-4 - pid6940_seq4	
> 	ipengine-script.py	
> metamod cell.py (1) [Python Run]	
> 	C:\git\metamod\cell.py	
> 
> 
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