Add note about installing git-lfs

Former-commit-id: 77dd1bdd4a

README.md

@@ -29,6 +29,10 @@ $ curl https://sh.rustup.rs -sSf | sh
 $ source $HOME/.cargo/env
 ```
 
+If you plan to run with GPU optimizations enabled (not recommended), you'll need a CUDA library stored in git LFS. Install git-lfs here:
+
+https://git-lfs.github.com/
+
 Now checkout the code from github:
 
 ```bash
@@ -133,6 +137,12 @@ Run the benchmarks:
 $ cargo +nightly bench --features="unstable"
 ```
 
+To run the benchmarks on Linux with GPU optimizations enabled:
+
+```bash
+$ cargo +nightly bench --features="unstable,cuda"
+```
+
 Code coverage
 ---
 

scripts/buildkite.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-export LD_LIBRARY_PATH=/usr/local/cuda/lib64
-source $HOME/.cargo/env
-export PATH=$PATH:/usr/local/cuda/bin
-cp /tmp/libcuda_verify_ed25519.a .
-cargo test --features=cuda