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Neptune now also runs on CUDA. Closes #104.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /// The build script is needed to compile the CUDA kernel. | ||
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| #[cfg(feature = "cuda")] | ||
| fn main() { | ||
| use std::path::PathBuf; | ||
| use std::process::Command; | ||
| use std::{env, fs}; | ||
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| use blstrs::Scalar as Fr; | ||
| use ec_gpu_gen::Limb32; | ||
| use sha2::{Digest, Sha256}; | ||
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| #[path = "src/proteus/sources.rs"] | ||
| mod sources; | ||
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| let kernel_source = sources::generate_program::<Fr, Limb32>(); | ||
| let out_dir = env::var("OUT_DIR").expect("OUT_DIR was not set."); | ||
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| // Make it possible to override the default options. Though the source and output file is | ||
| // always set automatically. | ||
| let mut nvcc = match env::var("NEPTUNE_CUDA_NVCC_ARGS") { | ||
| Ok(args) => execute::command(format!("nvcc {}", args)), | ||
| Err(_) => { | ||
| let mut command = Command::new("nvcc"); | ||
| command | ||
| .arg("--optimize=6") | ||
| .arg("--fatbin") | ||
| .arg("--gpu-architecture=sm_86") | ||
| .arg("--generate-code=arch=compute_86,code=sm_86") | ||
| .arg("--generate-code=arch=compute_80,code=sm_80") | ||
| .arg("--generate-code=arch=compute_75,code=sm_75"); | ||
| command | ||
| } | ||
| }; | ||
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| // Hash the source and and the compile flags. Use that as the filename, so that the kernel is | ||
| // only rebuilt if any of them change. | ||
| let mut hasher = Sha256::new(); | ||
| hasher.update(kernel_source.as_bytes()); | ||
| hasher.update(&format!("{:?}", &nvcc)); | ||
| let kernel_digest = hex::encode(hasher.finalize()); | ||
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| let source_path: PathBuf = [&out_dir, &format!("{}.cu", &kernel_digest)] | ||
| .iter() | ||
| .collect(); | ||
| let fatbin_path: PathBuf = [&out_dir, &format!("{}.fatbin", &kernel_digest)] | ||
| .iter() | ||
| .collect(); | ||
|
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||
| fs::write(&source_path, &kernel_source).unwrap_or_else(|_| { | ||
| panic!( | ||
| "Cannot write kernel source at {}.", | ||
| source_path.to_str().unwrap() | ||
| ) | ||
| }); | ||
|
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| // Only compile if the output doesn't exist yet. | ||
| if !fatbin_path.as_path().exists() { | ||
| let status = nvcc | ||
| .arg("--output-file") | ||
| .arg(&fatbin_path) | ||
| .arg(&source_path) | ||
| .status() | ||
| .expect("Cannot run nvcc."); | ||
|
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||
| if !status.success() { | ||
| panic!( | ||
| "nvcc failed. See the kernel source at {}", | ||
| source_path.to_str().unwrap() | ||
| ); | ||
| } | ||
| } | ||
|
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| // The idea to put the path to the farbin into a compile-time env variable is from | ||
| // https://github.com/LutzCle/fast-interconnects-demo/blob/b80ea8e04825167f486ab8ac1b5d67cf7dd51d2c/rust-demo/build.rs | ||
| println!( | ||
| "cargo:rustc-env=CUDA_FATBIN={}", | ||
| fatbin_path.to_str().unwrap() | ||
| ); | ||
| } | ||
|
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| #[cfg(not(feature = "cuda"))] | ||
| fn main() {} |
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