title: Tensor-flow Warnings for GPU Computation
body: <p>When I was running Hello Tensor-flow program on Google Cloud Instances, I have warnings below:</p>
  
  <pre><code>I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:910] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:885] Found device 0 with properties: 
  name: Tesla K80
  major: 3 minor: 7 memoryClockRate (GHz) 0.8235
  pciBusID 0000:00:04.0
  Total memory: 11.17GiB
  Free memory: 11.09GiB
  W tensorflow/stream_executor/cuda/cuda_driver.cc:590] creating context when one is currently active; existing: 0x27b1fe0
  
  
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 0 and 1
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 0 and 2
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 0 and 3
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 1 and 0
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 1 and 2
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 1 and 3
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 2 and 0
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 2 and 1
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 2 and 3
    tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 3 and 0
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 3 and 1
  I tensorflow/core/common_runtime/gpu/gpu_device.cc:777] Peer access not supported between device ordinals 3 and 2
  </code></pre>
  
  <p>I think the GPUs are actually giving me results but I am not sure if I need to fix those warnings.</p>
  
  <p>FYI, I also encountered the warnings for SSE3/SSE4.1/SSE4.2/AVX/AVX2/FMA compiling. But since I mainly work on GPU computation, I put them at lower priority.</p>