Use Criterion for benchmarks

Cargo.toml

@@ -20,7 +20,7 @@ thiserror = "1.0"
 zstd = { version = "0.8", optional = true }
 
 [dev-dependencies]
-bencher = "0.1"
+criterion = "0.3"
 rand = "0.7"
 walkdir = "2"
 

benches/read_entry.rs

@@ -1,16 +1,16 @@
-use bencher::{benchmark_group, benchmark_main};
+use criterion::{BenchmarkId, Criterion, Throughput};
+use criterion::{criterion_group, criterion_main};
 
 use std::io::{Cursor, Read, Write};
 
-use bencher::Bencher;
 use rand::Rng;
-use zip::{ZipArchive, ZipWriter};
+use zip::{CompressionMethod, ZipArchive, ZipWriter};
 
-fn generate_random_archive(size: usize) -> Vec<u8> {
+fn generate_random_archive(size: usize, method: Option<CompressionMethod>) -> Vec<u8> {
     let data = Vec::new();
     let mut writer = ZipWriter::new(Cursor::new(data));
-    let options =
-        zip::write::FileOptions::default().compression_method(zip::CompressionMethod::Stored);
+    let options = zip::write::FileOptions::default()
+        .compression_method(method.unwrap_or(CompressionMethod::Stored));
 
     writer.start_file("random.dat", options).unwrap();
 
@@ -23,24 +23,52 @@ fn generate_random_archive(size: usize) -> Vec<u8> {
     writer.finish().unwrap().into_inner()
 }
 
-fn read_entry(bench: &mut Bencher) {
+fn read_entry(bench: &mut Criterion) {
     let size = 1024 * 1024;
-    let bytes = generate_random_archive(size);
-    let mut archive = ZipArchive::new(Cursor::new(bytes.as_slice())).unwrap();
+    let bytes = generate_random_archive(size, None);
 
-    bench.iter(|| {
-        let mut file = archive.by_name("random.dat").unwrap();
-        let mut buf = [0u8; 1024];
-        loop {
-            let n = file.read(&mut buf).unwrap();
-            if n == 0 {
-                break;
-            }
-        }
-    });
+    //
+    let mut group = bench.benchmark_group("read_entry");
 
-    bench.bytes = size as u64;
+    //
+    for method in CompressionMethod::supported_methods().iter() {
+        group.bench_with_input(BenchmarkId::from_parameter(method), method, |b, method| {
+            b.iter(|| {
+                let mut archive = ZipArchive::new(Cursor::new(bytes.as_slice())).unwrap();
+                let mut file = archive.by_name("random.dat").unwrap();
+                let mut buf = [0u8; 1024];
+
+                let mut total_bytes = 0;
+
+                loop {
+                    let n = file.read(&mut buf).unwrap();
+                    total_bytes += n;
+                    if n == 0 {
+                        return total_bytes
+                    }
+                }
+            });
+        });
+    }
 }
 
-benchmark_group!(benches, read_entry);
-benchmark_main!(benches);
+fn write_random_archive(bench: &mut Criterion) {
+    let size = 1024 * 1024;
+
+    //
+    let mut group = bench.benchmark_group("write_random_archive");
+
+    //
+    for method in CompressionMethod::supported_methods().iter() {
+        group.bench_with_input(BenchmarkId::from_parameter(method), method, |b, method| {
+            b.iter(|| {
+                generate_random_archive(size, Some(method.clone()));
+            })
+        });
+    }
+
+    group.finish();
+}
+
+criterion_group!(benches, read_entry, write_random_archive);
+criterion_main!(benches);