Open Stack

Hi Rafael,
Thanks for your proposed workaround.
It works fine with Eclipse Pydev debugger.

Michel




De :    Rafael Durán Castañeda <rafadurancastaneda at gmail.com>
A :     openstack-dev at lists.openstack.org
Date :  22/08/2012 13:34
Objet : Re: [openstack-dev] Problem with debugging program      having 
eventlet.monkey_patch() code



On 08/21/2012 03:49 PM, michel.gauthier at bull.net wrote:
I have installed winpdb, but I have still a problem while debugging 
nova-scheduler service : 

on eventlet.monkey_patch() instruction, the debugger get the following 
exception : 


on winpdb GUI session ( launched thru : winpdb command and then atteched 
to the debugee session) 
Exception in thread Thread-57: 
Traceback (most recent call last): 
  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner 
    self.run() 
  File "/usr/lib/python2.7/threading.py", line 504, in run 
    self.__target(*self.__args, **self.__kwargs) 
  File "/usr/local/lib/python2.7/dist-packages/rpdb2.py", line 10790, in 
__event_monitor_proc 
    (n, sel) = self.getSession().getProxy().wait_for_event(PING_TIMEOUT, 
self.m_remote_event_index) 
  File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in __call__ 
    return self.__send(self.__name, args) 
  File "/usr/local/lib/python2.7/dist-packages/rpdb2.py", line 9520, in 
__request 
    raise _e 
RuntimeError: cannot release un-acquired lock 


on winpdb debugee session (launched thru : winpdb -d 
/usr/bin/nova-scheduler --flagfile=/etc/nova/nova.conf command) 
Exception in thread __worker_target: 
Traceback (most recent call last): 
  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner 
    self.run() 
  File "/usr/local/lib/python2.7/dist-packages/rpdb2.py", line 4574, in 
run 
    threading.Thread.run(self) 
  File "/usr/lib/python2.7/threading.py", line 504, in run 
    self.__target(*self.__args, **self.__kwargs) 
  File "/usr/local/lib/python2.7/dist-packages/rpdb2.py", line 9361, in 
__worker_target 
    self.m_lock.release() 
  File "/usr/lib/python2.7/threading.py", line 142, in release 
    raise RuntimeError("cannot release un-acquired lock") 
RuntimeError: cannot release un-acquired lock 


Help for a solution. 





De :        Michael J Fork <mjfork at us.ibm.com> 
A :        OpenStack Development Mailing List 
<openstack-dev at lists.openstack.org> 
Date :        17/08/2012 15:03 
Objet :        Re: [openstack-dev] Problem with debugging program having   
  eventlet.monkey_patch() code 



We have found that Winpdb (http://winpdb.org/ - platform independent 
despite Win in the name) works well with multi-threaded Python.  While 
using PyDev for development, run Winpdb as a remote debugger for the 
multithreaded service.  Flow is like this:

Launch Winpdb GUI
# winpdb

Start Debugging 
# cd /home/openstack-dev/workspace/nova/bin 
# winpdb -d -r <file_to_debug> 
Set Password: openstack 

Attach to Process
1) In Winpdb GUI, select File -> Attach
2) Enter password from step 4, should display files associated with that 
password 
3) Select process/file then select OK 
 
To Stop Debug or Make Changes and Restart 
1) File -> Stop to detach current debugger 
2) Make changes in Eclipse and Save (make sure development user has write 
privileges to repository) 
3) kill and restart winpdb debugging process started above
4) Re-attach to the process in the Winpdb GUI

Michael

-------------------------------------------------
Michael Fork
Cloud Architect, Emerging Solutions
IBM Systems & Technology Group

michel.gauthier at bull.net wrote on 08/17/2012 07:59:18 AM:

> From: michel.gauthier at bull.net
> To: openstack-dev at lists.openstack.org, 
> Date: 08/17/2012 08:02 AM
> Subject: [openstack-dev] Problem with debugging program having 
> eventlet.monkey_patch() code
> 
> Hi all, 
> I want to debug nova-scheduler service (Essex version)  code with 
> Eclipse->Pydev->Debug Configuration. 
> But when I launch it under Debug Configuration, I get the following 
> error messages : 
> 
> pydev debugger: starting 
> Traceback (most recent call last): 
>   File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line
> 336, in fire_timers 
>     timer() 
>   File "/usr/lib/python2.7/dist-packages/eventlet/hubs/timer.py", 
> line 56, in __call__ 
>     cb(*args, **kw) 
>   File "/usr/lib/python2.7/dist-packages/eventlet/semaphore.py", 
> line 95, in _do_acquire 
>     waiter.switch() 
> error: cannot switch to a different thread 
> 
> and then, Pydev debugger does not work! 
> 
> In fact, these errors are due to the use of eventlet.monkey_patch() 
inside 
> nova-scheduler launcher (as well as inside other nova-* launchers). 
> 
> Do you have any ideas to resolve this problem? 
> 
> Thanks in advance._______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
_______________________________________________
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_______________________________________________
OpenStack-dev mailing list
OpenStack-dev at lists.openstack.org
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev

As a quick workaround you can change monkey patching at nova-scheduler 
script:

 eventlet.monkey_patch(thread=False)

HTH_______________________________________________
OpenStack-dev mailing list
OpenStack-dev at lists.openstack.org
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev

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