Setting up xmr-stak miner on Ubuntu 18.04 with Nvidia card(s)

xmr-stak_cuda_setup.md

I wrote this tutorial because I've seen bits and chips of this topic, but never a full tutorial (especially not an up-to-date one).

This tutorial is intented for miners who want to mine Monero (or any other coin supported by xmr-stak) on a Ubuntu based system, with Nvidia cards (note: the tutorial works fine with CPU-only mining, just skip the driver installing part, and use -DCUDA_ENABLE=OFF -DOpenCL_ENABLE=OFF flags for cmake)

I assume You have a fresh install of Ubuntu, make sure Your system is up-to-date

sudo apt update && sudo apt upgrade

Install the latest version of the Nvidia driver avialable in the apt repository (which is 384 as of now)

sudo apt install nvidia-384

Note: some newer cards (like the RTX series) may require a newer version of the driver, in which case You should download it directly from Nvidia's page. To install the latest avialable (which is 410 as of now), fetch it from their download server

wget http://us.download.nvidia.com/XFree86/Linux-x86_64/410.93/NVIDIA-Linux-x86_64-410.93.run

Make it executable, and execute it as root

chmod +x NVIDIA-Linux-x86_64-410.93.run

sudo ./NVIDIA-Linux-x86_64-410.93.run

Follow the steps of the installer to have the latest driver installed on Your system

Either way You chose, make sure the driver is really installed

nvidia-smi

It should write some basic information regarding Your GPU(s)

Next thing is setting up CUDA, which is also avialable in our repository

sudo apt install nvidia-cuda-toolkit

As with the Nvidia drivers, they are new (9.1 as of now), but not the newest avialable. As far as I can tell, it supports all Nvidia cards and is suitable for xmr-stak, but if for some reason You need the latest version available (10 as of now), You can download it directly from Nvidia's page

wget https://developer.nvidia.com/compute/cuda/10.0/Prod/local_installers/cuda_10.0.130_410.48_linux

..and execute it

sudo sh cuda_10.0.130_410.48_linux.run

Either way, You should have CUDA installed

nvcc --version

Note: if either nvidia-smi or nvcc fails to show the GPU(s), don't panic, just reboot, and they should work perfectly

Now time for the xmr-stak miner itself

First we'll need some libraries and git

sudo apt install libmicrohttpd-dev libssl-dev cmake build-essential libhwloc-dev git

** Before building xmr-stak, a problem that is encountered on Ubuntu 17.10 and upward, is with the gcc version it comes shipped with (version 7). To compile xmr-stak with CUDA support, we have to use a prior version of gcc

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 10

Now You need to clone the repository and build it

git clone https://github.com/fireice-uk/xmr-stak.git

mkdir xmr-stak/build

cd xmr-stak/build

cmake .. -DOpenCL_ENABLE=OFF

make install

Your binary is ready, to run it

cd ~/xmr-stak/build/bin

chmod +x xmr-stak

./xmr-stak

Now it will guide You through an initial setup

1. Probably choose 0, unless You'd like to check Your hashrate remotely

2. Entermonero (or any other coin sopported by xmr-stak)

3. Choose a pool, preferably one close to You, and type it in the following format: pool.example.com:3333

4. Username is pretty much Your wallet address (some pools interpret a rig identifier after Your address, separated with a .)

5. Password is mostly empty or x

6. Rig identifier (except for pools mentioned in step 4), could by empty

7. TLS/SSL, in most cases N

8. Nicehash support, in most cases n

9. Multiple pools, n unless You need multiple pools set up for some reason

That's it, xmr-stak will start mining, you can check Your hashrate anytime by pressing h

I would recommend running xmr-stak on a screen session, so You can detach it and work on other stuff. In case You haven't used screen before

sudo apt install screen

screen -S miner

cd ~/xmr-stak/build/bin

xmr-stak

Now You can detach with CTRL+A+D

Either way, Your xmr-stak has created some files in the ~/xmr-stak/build/bin directory (namely config.txt, cpu.txt, nvidia.txt and pools.txt), You can modify any of them in case You want to reconfigure xmr-stak (most often pools.txt), or delete them, and You'll be hit with the initial setup again.

I hope this tutorial helped You setting up xmr-stak, all kudos goes to the creators: fireice-uk and psychocrypt

In case You liked this tutorial, consider buying me a beer

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Hi. I'm trying to install this following your instructions, and they are spot-on until I get to "sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 10" where I get the error, unsupported GNU version.
gcc --verion reports that Ubuntu 18.04.2 LTS will only install GCC 6.5, which causes the "make install" command to fail, of course.
Can you suggest a work-around for this?
Thank you.

To fix the gcc --version error add these two lines
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 10
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 10