1 files changed, 157 insertions, 0 deletions
diff --git a/third_party/rust/scroll/benches/bench.rs b/third_party/rust/scroll/benches/bench.rs
new file mode 100644
index 0000000000..0787dbe14b
--- /dev/null
+++ b/third_party/rust/scroll/benches/bench.rs
@@ -0,0 +1,157 @@
+#![feature(test)]
+extern crate test;
+
+use scroll::{Cread, Pread, LE};
+use test::black_box;
+
+#[bench]
+fn bench_parallel_cread_with(b: &mut test::Bencher) {
+    use rayon::prelude::*;
+    let vec = vec![0u8; 1_000_000];
+    let nums = vec![0usize; 500_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        nums.par_iter().for_each(|offset| {
+            let _: u16 = black_box(data.cread_with(*offset, LE));
+        });
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_cread_vec(b: &mut test::Bencher) {
+    let vec = vec![0u8; 1_000_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        for val in data.chunks(2) {
+            let _: u16 = black_box(val.cread_with(0, LE));
+        }
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_cread(b: &mut test::Bencher) {
+    const NITER: i32 = 100_000;
+    b.iter(|| {
+        for _ in 1..NITER {
+            let data = black_box([1, 2]);
+            let _: u16 = black_box(data.cread(0));
+        }
+    });
+    b.bytes = 2 * NITER as u64;
+}
+
+#[bench]
+fn bench_pread_ctx_vec(b: &mut test::Bencher) {
+    let vec = vec![0u8; 1_000_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        for val in data.chunks(2) {
+            let _: Result<u16, _> = black_box(val.pread(0));
+        }
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_pread_with_unwrap(b: &mut test::Bencher) {
+    const NITER: i32 = 100_000;
+    b.iter(|| {
+        for _ in 1..NITER {
+            let data: &[u8] = &black_box([1, 2]);
+            let _: u16 = black_box(data.pread_with(0, LE).unwrap());
+        }
+    });
+    b.bytes = 2 * NITER as u64;
+}
+
+#[bench]
+fn bench_pread_vec(b: &mut test::Bencher) {
+    let vec = vec![0u8; 1_000_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        for val in data.chunks(2) {
+            let _: Result<u16, _> = black_box(val.pread_with(0, LE));
+        }
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_pread_unwrap(b: &mut test::Bencher) {
+    const NITER: i32 = 100_000;
+    b.iter(|| {
+        for _ in 1..NITER {
+            let data = black_box([1, 2]);
+            let _: u16 = black_box(data.pread(0)).unwrap();
+        }
+    });
+    b.bytes = 2 * NITER as u64;
+}
+
+#[bench]
+fn bench_gread_vec(b: &mut test::Bencher) {
+    let vec = vec![0u8; 1_000_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        for val in data.chunks(2) {
+            let mut offset = 0;
+            let _: Result<u16, _> = black_box(val.gread(&mut offset));
+        }
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_gread_unwrap(b: &mut test::Bencher) {
+    const NITER: i32 = 100_000;
+    b.iter(|| {
+        for _ in 1..NITER {
+            let data = black_box([1, 2]);
+            let mut offset = 0;
+            let _: u16 = black_box(data.gread_with(&mut offset, LE).unwrap());
+        }
+    });
+    b.bytes = 2 * NITER as u64;
+}
+
+#[bench]
+fn bench_parallel_pread_with(b: &mut test::Bencher) {
+    use rayon::prelude::*;
+    let vec = vec![0u8; 1_000_000];
+    let nums = vec![0usize; 500_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        nums.par_iter().for_each(|offset| {
+            let _: Result<u16, _> = black_box(data.pread_with(*offset, LE));
+        });
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_byteorder_vec(b: &mut test::Bencher) {
+    use byteorder::ReadBytesExt;
+    let vec = vec![0u8; 1_000_000];
+    b.iter(|| {
+        let data = black_box(&vec[..]);
+        for mut val in data.chunks(2) {
+            let _: Result<u16, _> = black_box(val.read_u16::<byteorder::LittleEndian>());
+        }
+    });
+    b.bytes = vec.len() as u64;
+}
+
+#[bench]
+fn bench_byteorder(b: &mut test::Bencher) {
+    use byteorder::ByteOrder;
+    const NITER: i32 = 100_000;
+    b.iter(|| {
+        for _ in 1..NITER {
+            let data = black_box([1, 2]);
+            let _: u16 = black_box(byteorder::LittleEndian::read_u16(&data));
+        }
+    });
+    b.bytes = 2 * NITER as u64;
+}