Tensorflow v0.10 installed from scratch on Ubuntu 16.04, CUDA 8.0RC+Patch, cudnn v5.1 with a 1080GTX

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1 Tensorflow v0.10 installed from scratch on Ubuntu 16.04, CUDA 8.0RC+Patch, cudnn v5.1 with a 1080GTX While Tensorflow has a great documentation, you have quite a lot of details that are not obvious, especially the part about setting up Nvidia libraries and installing Bazel as you need to read external install guides. There is also a CROSSTOOL change to make to fix an include directory issue. So here is a guide, explaining everything from scratch in a single page. 1. Installing Nvidia drivers The first step is to get the latest Nvidia driver. While you can use apt-get to install the driver and CUDA, this causes a lot of issues with automatic updates and you need to purge everything to reinstall a new version. It is simpler to do everything manually. Go to Nvidia s download website and download the latest version of the driver, here for Linux 64-bit. In my case, NVIDIA-Linux-x86_ run. As drivers for graphic devices are running at a low level, you must exit the GUI with sudo service lightdm stop and set the RunLevel to 3 with the program init. Then, move to the directory where you downloaded the.run file and run it. You will be asked to confirm several things, the pre-install of something failure, no 32-bit libraries and more. Just continue to the end. Once it is done, reboot. sudo service lightdm stop sudo init 3 sudo sh NVIDIA-Linux-x86_ run sudo reboot Login loop issue after updates Due to the manual installation, it seems that when you do Ubuntu updates, they may install the apt-get version of the driver. This causes a failure when you start the computer and login, you will get a black screen and go back to the login screen. The solution is to enter the terminal with CTRL+ALT+F1 and reinstall the driver just like before. Note that you can get back to the GUI with Alt+F7 when you are in the terminal. 2. Installing CUDA Install the Toolkit

2 It s now time for CUDA. Go to the Nvidia CUDA website and create an account if you don t already have one and log in (I think this is only required for RC versions of CUDA, which is the case currently for CUDA 8.0RC, an account is also required to download cudnn). Choose Linux > x86_64 > Ubuntu > > runfile (local) and download the base installer and the patch. Ubuntu uses GCC as default C compiler, which caused an issue with CUDA 8.0RC, this is fixed with the patch. The installer has 3 parts, a Nvidia driver, CUDA Toolkit and CUDA code samples. The Nvidia driver is usually outdated, that s why we installed it before, say no when asked if you want to install the driver (in Nvidia s install guide, they tell us to enter RunLevel 3, but this isn t necessary if we don t install the driver). Then, let everything as default, install the code samples to check your CUDA installation. To avoid an error about GCC 5.4.0, add --override. Then, once the installation is over, run the patch. sudo sh cuda_8.0.27_linux.run --override sudo sh cuda_ _linux.run Update paths in.bashrc The next part is to update CUDA_HOME, PATH and LD_LIBRARY_PATH. Move to your home folder and update.bashrc then reload.bashrc with the command source. For those who are not Linux experts,.bashrc is a file with user parameters that is launched when you login, you must reload it or restart the session for the changes to be active. cd /home/username/ gedit.bashrc At the bottom of the file, add the following lines and save: export CUDA_HOME=/usr/local/cuda-8.0 export PATH=/usr/local/cuda-8.0/bin${PATH:+:${PATH}} export LD_LIBRARY_PATH=/usr/local/cuda- 8.0/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}} You can then reload.bashrc and check that the paths have been properly modified. source ~/.bashrc echo $CUDA_HOME echo $PATH echo $LD_LIBRARY_PATH

3 (Optional) Check that CUDA is working Then, you can check is CUDA is working by checking the version of nvcc the CUDA compiler and also by moving to the sample directory and compiling bandwidthtest. nvcc --version cd NVIDIA_CUDA-8.0_Samples/1_Utilities/bandwidthTest/ make./bandwidthtest You should get an output that looks like this: [CUDA Bandwidth Test] - StartingC Running onc Device 0: GeForce GTX 1080 Quick Mode Host to Device Bandwidth, 1 Device(s) PINNED Memory Transfers Transfer Size (Bytes) Bandwidth(MB/s) Device to Host Bandwidth, 1 Device(s) PINNED Memory Transfers Transfer Size (Bytes) Bandwidth(MB/s) Device to Device Bandwidth, 1 Device(s) PINNED Memory Transfers Transfer Size (Bytes) Bandwidth(MB/s) Result = PASS NOTE: The CUDA Samples are not meant for performance measurements. Results may vary when GPU Boost is enabled. You can now move to cudnn! 3. Installing cudnn Go to the Nvidia cudnn website, login and download Download cudnn v5.1 (August 10, 2016), for CUDA 8.0 RC > cudnn v5.1 Library for Linux. Unzip the.tgz file and copy the files to the cuda-8.0 folder. Note that some of the.so files are links to the real.so file, by copying it, we duplicate the file, that way, when building Tensorflow from source, any cudnn version will give libcudnn.so tar xvzf cudnn-8.0-linux-x64-v5.1.tgz cd cuda

4 sudo cp include/cudnn.h /usr/local/cuda-8.0/include/ sudo cp lib64/* /usr/local/cuda-8.0/lib64/ That s it. As you see, it is quite easy to add or remove cudnn and replace it by another version of the library. 4. Installing Tensorflow It s now time to install Tensorflow from source as the official binaries are only for CUDA 7.5. We will install it for Python2.7. Install dependencies First, install some general dependancies. sudo apt-get install python-pip python-numpy swig python-dev pythonwheel Install Bazel Then install Bazel, a build tool from Google. First, you need to download and install JDK 8. sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java8-installer It s now time to get Bazel. echo "deb [arch=amd64] stable jdk1.8" sudo tee /etc/apt/sources.list.d/bazel.list curl sudo apt-key add - sudo apt-get update && sudo apt-get install bazel sudo apt-get upgrade bazel Install Tensorflow itself First, you must get the code from Github. You can either take the most recent master branch (lots of new commits) or the latest release branch (should be more stable, but still updated every few days). Here, we get branch r0.10. git clone -b r0.10

5 cd tensorflow Important: fix CROSSTOOL file Edit the text file tensorflow/third_party/gpus/crosstool/crosstool and add cxx_builtin_include_directory: "/usr/local/cuda-8.0/include" as below. cxx_builtin_include_directory: "/usr/lib/gcc/" cxx_builtin_include_directory: "/usr/local/include" cxx_builtin_include_directory: "/usr/include" cxx_builtin_include_directory: "/usr/local/cuda-8.0/include" tool_path { name: "gcov" path: "/usr/bin/gcov" } If you don t do this, you will get an error that looks like this: ERROR: /home/marcnu/documents/tensorflow/tensorflow/contrib/rnn/build:46:1: undeclared inclusion(s) in rule //tensorflow/contrib/rnn:python/ops/_lstm_ops_gpu : this rule is missing dependency declarations for the following files included by tensorflow/contrib/rnn/kernels/lstm_ops_gpu.cu.cc : /usr/local/cuda-8.0/include/cuda_runtime.h /usr/local/cuda-8.0/include/host_config.h C /usr/local/cuda-8.0/include/curand_discrete2.h. nvcc warning : option relaxed-constexpr has been deprecated and replaced by option expt-relaxed-constexpr. nvcc warning : option relaxed-constexpr has been deprecated and replaced by option expt-relaxed-constexpr. Target //tensorflow/tools/pip_package:build_pip_package failed to build Use verbose_failures to see the command lines of failed build steps. INFO: Elapsed time: s, Critical Path: s You can now run the configure script. If you have only cuda 8.0, then leaving everything as default should be fine. I just provided the compute capability of my GPU, in my case 6.1../configure Please specify the location of python. [Default is /usr/bin/python]: Do you wish to build TensorFlow with Google Cloud Platform support? [y/n] N No Google Cloud Platform support will be enabled for TensorFlow Found possible Python library paths: /usr/local/lib/python2.7/dist-packages /usr/lib/python2.7/dist-packages Please input the desired Python library path to use. Default is [/usr/local/lib/python2.7/dist-packages]

6 /usr/local/lib/python2.7/dist-packages Do you wish to build TensorFlow with GPU support? [y/n] y GPU support will be enabled for TensorFlow Please specify which gcc should be used by nvcc as the host compiler. [Default is /usr/bin/gcc]: Please specify the Cuda SDK version you want to use, e.g [Leave empty to use system default]: Please specify the location where CUDA toolkit is installed. Refer to README.md for more details. [Default is /usr/local/cuda]: Please specify the Cudnn version you want to use. [Leave empty to use system default]: Please specify the location where cudnn library is installed. Refer to README.md for more details. [Default is /usr/local/cuda]: libcudnn.so resolves to libcudnn.5 Please specify a list of comma-separated Cuda compute capabilities you want to build with. You can find the compute capability of your device at: Please note that each additional compute capability significantly increases your build time and binary size. [Default is: 3.5,5.2 ]: 6.1 Setting up Cuda include Setting up Cuda lib64 Setting up Cuda bin Setting up Cuda nvvm Setting up CUPTI include Setting up CUPTI lib64 Configuration finished You can then run Bazel. The build will take quite a lot of time, 900s on my PC. Then, create the pip package and install it with pip. The name of the pip package may be different depending of Tensorflow s version. bazel build -c opt --config=cuda //tensorflow/tools/pip_package:build_pip_package bazel-bin/tensorflow/tools/pip_package/build_pip_package /tmp/tensorflow_pkg pip install /tmp/tensorflow_pkg/tensorflow py2-none-any.whl That s it, Tensorflow is installed! (Optional) Check that Tensorflow is working You can create a test.py file with the following code and run it to check that everything is working and that the GPU is recognised. import tensorflow as tf

7 hello = tf.constant('hello, TensorFlow!') sess = tf.session() print(sess.run(hello)) # Hello, TensorFlow! a = tf.constant(10) b = tf.constant(32) print(sess.run(a + b)) # 42 python test.py libcublas.so.8.0 locally libcudnn.so.5 locally libcufft.so.8.0 locally libcuda.so.1 locally libcurand.so.8.0 locally I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:925] 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_init.cc:118] Found device 0 with properties: name: GeForce GTX 1080 major: 6 minor: 1 memoryclockrate (GHz) pcibusid 0000:01:00.0 Total memory: 7.92GiB Free memory: 7.52GiB I tensorflow/core/common_runtime/gpu/gpu_init.cc:138] DMA: 0 I tensorflow/core/common_runtime/gpu/gpu_init.cc:148] 0: Y I tensorflow/core/common_runtime/gpu/gpu_device.cc:870] Creating TensorFlow device (/gpu:0) -> (device: 0, name: GeForce GTX 1080, pci bus id: 0000:01:00.0) Hello, TensorFlow! 42 You can now start having fun. Written on August 17, 2016