1 files changed, 120 insertions, 0 deletions
diff --git a/third_party/rust/litemap/benches/litemap.rs b/third_party/rust/litemap/benches/litemap.rs
new file mode 100644
index 0000000000..b32b8ba878
--- /dev/null
+++ b/third_party/rust/litemap/benches/litemap.rs
@@ -0,0 +1,120 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use litemap::LiteMap;
+
+const DATA: [(&str, &str); 16] = [
+    ("ar", "Arabic"),
+    ("bn", "Bangla"),
+    ("ccp", "Chakma"),
+    ("chr", "Cherokee"),
+    ("el", "Greek"),
+    ("en", "English"),
+    ("eo", "Esperanto"),
+    ("es", "Spanish"),
+    ("fr", "French"),
+    ("iu", "Inuktitut"),
+    ("ja", "Japanese"),
+    ("ru", "Russian"),
+    ("sr", "Serbian"),
+    ("th", "Thai"),
+    ("tr", "Turkish"),
+    ("zh", "Chinese"),
+];
+
+const POSTCARD: [u8; 176] = [
+    16, 2, 97, 114, 6, 65, 114, 97, 98, 105, 99, 2, 98, 110, 6, 66, 97, 110, 103, 108, 97, 3, 99,
+    99, 112, 6, 67, 104, 97, 107, 109, 97, 3, 99, 104, 114, 8, 67, 104, 101, 114, 111, 107, 101,
+    101, 2, 101, 108, 5, 71, 114, 101, 101, 107, 2, 101, 110, 7, 69, 110, 103, 108, 105, 115, 104,
+    2, 101, 111, 9, 69, 115, 112, 101, 114, 97, 110, 116, 111, 2, 101, 115, 7, 83, 112, 97, 110,
+    105, 115, 104, 2, 102, 114, 6, 70, 114, 101, 110, 99, 104, 2, 105, 117, 9, 73, 110, 117, 107,
+    116, 105, 116, 117, 116, 2, 106, 97, 8, 74, 97, 112, 97, 110, 101, 115, 101, 2, 114, 117, 7,
+    82, 117, 115, 115, 105, 97, 110, 2, 115, 114, 7, 83, 101, 114, 98, 105, 97, 110, 2, 116, 104,
+    4, 84, 104, 97, 105, 2, 116, 114, 7, 84, 117, 114, 107, 105, 115, 104, 2, 122, 104, 7, 67, 104,
+    105, 110, 101, 115, 101,
+];
+
+/// Run this function to print new data to the console.
+#[allow(dead_code)]
+fn generate() {
+    let map = build_litemap(false);
+    let buf = postcard::to_stdvec(&map).unwrap();
+    println!("{buf:?}");
+}
+
+fn large_litemap_postcard_bytes() -> Vec<u8> {
+    postcard::to_stdvec(&build_litemap(true)).unwrap()
+}
+
+fn overview_bench(c: &mut Criterion) {
+    // Uncomment the following line to re-generate the binary data.
+    // generate();
+
+    bench_deserialize(c);
+    bench_deserialize_large(c);
+    bench_lookup(c);
+    bench_lookup_large(c);
+
+    #[cfg(feature = "generate")]
+    generate_test_data();
+}
+
+fn build_litemap(large: bool) -> LiteMap<String, String> {
+    let mut map: LiteMap<String, String> = LiteMap::new();
+    for (key, value) in DATA.into_iter() {
+        if large {
+            for n in 0..8192 {
+                map.insert(format!("{key}{n}"), value.to_owned());
+            }
+        } else {
+            map.insert(key.to_owned(), value.to_owned());
+        }
+    }
+    map
+}
+
+fn bench_deserialize(c: &mut Criterion) {
+    c.bench_function("litemap/deserialize/small", |b| {
+        b.iter(|| {
+            let map: LiteMap<String, String> = postcard::from_bytes(black_box(&POSTCARD)).unwrap();
+            assert_eq!(map.get("iu"), Some(&"Inuktitut".to_owned()));
+        })
+    });
+}
+
+fn bench_deserialize_large(c: &mut Criterion) {
+    let buf = large_litemap_postcard_bytes();
+    c.bench_function("litemap/deseralize/large", |b| {
+        b.iter(|| {
+            let map: LiteMap<String, String> = postcard::from_bytes(black_box(&buf)).unwrap();
+            assert_eq!(map.get("iu3333"), Some(&"Inuktitut".to_owned()));
+        });
+    });
+}
+
+fn bench_lookup(c: &mut Criterion) {
+    let map: LiteMap<String, String> = postcard::from_bytes(&POSTCARD).unwrap();
+    c.bench_function("litemap/lookup/small", |b| {
+        b.iter(|| {
+            assert_eq!(map.get(black_box("iu")), Some(&"Inuktitut".to_owned()));
+            assert_eq!(map.get(black_box("zz")), None);
+        });
+    });
+}
+
+fn bench_lookup_large(c: &mut Criterion) {
+    let buf = large_litemap_postcard_bytes();
+    let map: LiteMap<String, String> = postcard::from_bytes(&buf).unwrap();
+    c.bench_function("litemap/lookup/large", |b| {
+        b.iter(|| {
+            assert_eq!(map.get(black_box("iu3333")), Some(&"Inuktitut".to_owned()));
+            assert_eq!(map.get(black_box("zz")), None);
+        });
+    });
+}
+
+criterion_group!(benches, overview_bench);
+criterion_main!(benches);