Re: [modeller_usage] Parallel job (part 2)

[Modeller Caretaker <>]

Francesco Musiani wrote:
> Ok, I modified my script as in the example.
...
> class mymodel(allhmodel):
> 	def special_restraints(self, aln):
> 		s1 = selection(self.chains['A'])
> 		s2 = selection(self.chains['B'])
> 		self.restraints.symmetry.append(symmetry(s1, s2, 1.0))
> 	def user_after_single_model(self):
> 		self.restraints.symmetry.report(1.0)
...
> i obtained this error:
...
> modeller.parallel.communicator.RemoteError: AttributeError: 'module' object has no attribute 'mymodel' from <Slave on localhost>

The parallel module uses Python's pickle module to send classes to 
slaves, so is subject to the same restrictions as regular pickle: see 
http://docs.python.org/lib/node317.html

In particular, this means that you can't define a subclass in your main 
script (because the slaves can't import it) - move your 'mymodel' class 
to a separate file, e.g. mymodel.py, and then import it into your main 
script ('from mymodel import mymodel').

See, for an example, examples/python/parallel-task.py

	Ben Webb, Modeller Caretaker
--
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