From 0e8fcd0390377ae8b62201970eac2cd28b83c917 Mon Sep 17 00:00:00 2001
From: mat ess <mat@mat.services>
Date: Tue, 18 Apr 2023 22:05:33 -0400
Subject: [PATCH] Add benchmarks and cargo-flamegraph

---
 .gitignore               |   2 +-
 Cargo.lock               | 650 +++++++++++++++++++++++++++++++++++++++
 Cargo.toml               |  11 +
 benches/bench_library.rs |  78 +++++
 flake.nix                |   2 +
 src/library.rs           |   6 +-
 src/main.rs              |   2 +-
 7 files changed, 746 insertions(+), 5 deletions(-)
 create mode 100644 benches/bench_library.rs

diff --git a/.gitignore b/.gitignore
index 9bc91cd..6dc7732 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,7 @@
 /result
 /target
 /.pre-commit-config.yaml
-
+flamegraph.svg
 
 # Added by cargo
 #
diff --git a/Cargo.lock b/Cargo.lock
index 16aba8c..f91a0ca 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,11 +2,298 @@
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+ "cfg-if",
+ "wasm-bindgen-macro",
+]
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+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "wasm-bindgen-shared",
+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
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+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
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diff --git a/Cargo.toml b/Cargo.toml
index 665409b..e5a4cd0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,14 @@ edition = "2021"
 
 [dependencies]
 nanoserde = "0.1.32"
+
+[dev-dependencies]
+criterion = "0.4.0"
+rand = "0.8.5"
+
+[[bench]]
+name = "bench_library"
+harness = false
+
+[profile.bench]
+debug = true
diff --git a/benches/bench_library.rs b/benches/bench_library.rs
new file mode 100644
index 0000000..858d01d
--- /dev/null
+++ b/benches/bench_library.rs
@@ -0,0 +1,78 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use rand::{
+    distributions::{Alphanumeric, DistString},
+    thread_rng, Rng,
+};
+
+use cover::library::{Artist, Library, Song};
+
+// actual benchmarks
+
+fn bench_random_library(c: &mut Criterion) {
+    bench_random_library_with_sizes(c, "small", 5, 25);
+    bench_random_library_with_sizes(c, "medium", 25, 100);
+    bench_random_library_with_sizes(c, "large", 100, 1000);
+    bench_random_library_with_sizes(c, "massive", 1000, 2500);
+}
+
+fn bench_supermassive_random_library(c: &mut Criterion) {
+    bench_random_library_with_sizes(c, "supermassive", 2500, 7500);
+}
+
+// benchmark helpers
+
+fn bench_random_library_with_sizes(c: &mut Criterion, size: &str, artists: usize, songs: usize) {
+    let id = format!("{size} random library ({artists} artists x {songs} songs/artist)");
+    let library = random_library(artists, songs);
+    c.bench_function(id.as_str(), |b| {
+        b.iter(|| {
+            library.library_covers();
+        })
+    });
+}
+
+// test data generators
+
+fn random_string() -> String {
+    let mut rng = thread_rng();
+    let length = rng.gen_range(1..=20);
+    Alphanumeric.sample_string(&mut rng, length)
+}
+
+fn generate_iter<T: Clone>(generator: impl Fn() -> T, length: usize) -> impl Iterator<Item = T> {
+    let mut ts = Vec::with_capacity(length);
+    for _ in 0..length {
+        ts.push(generator())
+    }
+    ts.into_iter()
+}
+
+fn random_song() -> Song {
+    Song::new(
+        random_string(),
+        random_string(),
+        generate_iter(random_string, 5),
+    )
+}
+
+fn random_artist(songs: usize) -> Artist {
+    Artist::new(
+        random_string(),
+        generate_iter(random_string, 5),
+        generate_iter(random_song, songs),
+    )
+}
+
+fn random_library(artists: usize, songs_per_artist: usize) -> Library {
+    Library::new(generate_iter(|| random_artist(songs_per_artist), artists))
+}
+
+// entrypoint
+
+criterion_group!(benches, bench_random_library);
+criterion_group! {
+    name = slow_benches;
+    config = Criterion::default().sample_size(20);
+    targets = bench_supermassive_random_library
+}
+criterion_main!(benches, slow_benches);
diff --git a/flake.nix b/flake.nix
index e9648c0..e55d4a8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -57,6 +57,8 @@
                 rust-analyzer
                 # rustfmt
                 clippy
+                # profiling
+                cargo-flamegraph
                 ;
               rustfmt = pkgs.rustfmt.overrideAttrs (old: {
                 preFixup = pkgs.lib.optionalString pkgs.stdenv.isDarwin ''
diff --git a/src/library.rs b/src/library.rs
index 6bff014..8ff4c9d 100644
--- a/src/library.rs
+++ b/src/library.rs
@@ -26,7 +26,7 @@ impl Library {
             })
     }
 
-    pub fn find_library_covers(&self) -> HashSet<&Song> {
+    pub fn library_covers(&self) -> HashSet<&Song> {
         self.all_covers()
             .into_iter()
             .filter(|song| song.is_library_cover(self))
@@ -234,7 +234,7 @@ mod tests {
 
     #[test]
     fn test_find_covers() {
-        assert!(library().find_library_covers() == [&love_story("black midi")].into())
+        assert!(library().library_covers() == [&love_story("black midi")].into())
     }
 
     #[test]
@@ -242,7 +242,7 @@ mod tests {
         assert!(Library {
             artists: [bon_iver()].into()
         }
-        .find_library_covers()
+        .library_covers()
         .is_empty())
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 9e87683..cba449a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,7 +11,7 @@ fn main() {
     let json = fs::read_to_string(file_path).expect("Failed to open library file");
     let library: Library =
         DeJson::deserialize_json(&json).expect("Failed to deserialize library file");
-    for cover in library.find_library_covers() {
+    for cover in library.library_covers() {
         println!("Found cover!");
         println!(
             "{}, by {:?}, covered by {}",