title: why tensorflow just outputs killed
body: <p>When I run my tensorflow app, it just outputs "killed". How do I debug this?</p>
  
  <p><a href="https://github.com/reachlin/machinelearning/blob/master/tensorflow/sample_cnn.py" rel="noreferrer">source code</a></p>
  
  <pre><code>root@8e4a3a65184e:~/tensorflow# python sample_cnn.py 
  INFO:tensorflow:Using default config.
  INFO:tensorflow:Using config: {'_save_checkpoints_secs': 600, '_session_config': None, '_keep_checkpoint_max': 5, '_tf_random_seed': 1, '_keep_checkpoint_every_n_hours': 10000, '_save_checkpoints_steps': None, '_model_dir': 'data/convnet_model', '_save_summary_steps': 100}
  INFO:tensorflow:Create CheckpointSaverHook.
  2017-08-17 12:56:53.160481: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.1 instructions, but these are available on your machine and could speed up CPU computations.
  2017-08-17 12:56:53.160536: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use SSE4.2 instructions, but these are available on your machine and could speed up CPU computations.
  2017-08-17 12:56:53.160545: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX instructions, but these are available on your machine and could speed up CPU computations.
  2017-08-17 12:56:53.160550: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use AVX2 instructions, but these are available on your machine and could speed up CPU computations.
  2017-08-17 12:56:53.160555: W tensorflow/core/platform/cpu_feature_guard.cc:45] The TensorFlow library wasn't compiled to use FMA instructions, but these are available on your machine and could speed up CPU computations.
  Killed
  </code></pre>