This may way off, but is it possible your theanorc or theano flags has 
allow_gc=False, and that that is causing your problem?

On Thursday, April 6, 2017 at 1:14:41 AM UTC+2, Julien wrote:
>
> I am running this popular tutorial 
> <http://deeplearning.net/tutorial/mlp.html> that is training a simple MLP 
> on MNIST. I run on CPU. While monitoring my computer activity in the 
> training loop, I can see that the memory usage is steadily increasing, 
> until it reaches 100% and everything crashes (need to reboot). I am on 
> Ubuntu 16.04 and using the bleeding edge version of Theano.
>
>
> I have made a post <https://github.com/Theano/Theano/issues/5810> on 
> theano-issues on github and a question 
> <http://stackoverflow.com/questions/43234170/memory-gradually-increasing-until-crash-while-training-simple-mlp-on-cpu-with-th>
>  
> on StackOverflow.
>
>
> Is anyone experiencing the same issue on CPU?
>

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