upstream/ipython Files · IPython/kernel/zmq/log.py

Prevent qtconsole frontend freeze on lots of output....

Prevent qtconsole frontend freeze on lots of output. The output from the kernel is now clipped to last `buffer_size` before displaying and a timer is used to flush the pending output text instead of attempting to display text on every stream output from kernel. The timer interval is adjusted based on actual time taken to append a screenful of text to widget. This throttles the widget repaints and avoids choking the Qt event loop leaving time to handle other Qt events. Test cases: In [1]: for i in xrange(1000000): print i In [2]: range(100000) Without this commit the first input causes the qtconsole frontend to freeze, not responding to `Ctrl+C`.

Thomas Kluyver - - Load All Authors

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             log.py
        
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      from logging import INFO, DEBUG, WARN, ERROR, FATAL

      from zmq.log.handlers import PUBHandler

      class EnginePUBHandler(PUBHandler):

          """A simple PUBHandler subclass that sets root_topic"""

          engine=None

          def __init__(self, engine, *args, **kwargs):

              PUBHandler.__init__(self,*args, **kwargs)

              self.engine = engine

          @property

          def root_topic(self):

              """this is a property, in case the handler is created

              before the engine gets registered with an id"""

              if isinstance(getattr(self.engine, 'id', None), int):

                  return "engine.%i"%self.engine.id

              else:

                  return "engine"

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				from logging import INFO, DEBUG, WARN, ERROR, FATAL

				from zmq.log.handlers import PUBHandler

				class EnginePUBHandler(PUBHandler):
				"""A simple PUBHandler subclass that sets root_topic"""
				engine=None

				def __init__(self, engine, args, *kwargs):
				PUBHandler.__init__(self,args, *kwargs)
				self.engine = engine

				@property
				def root_topic(self):
				"""this is a property, in case the handler is created
				before the engine gets registered with an id"""
				if isinstance(getattr(self.engine, 'id', None), int):
				return "engine.%i"%self.engine.id
				else:
				return "engine"