perf: improve cksum benchmarks with meaningful workloads

- Increase file sizes from 10MB to 50MB for actual algorithm performance measurement
- Remove meaningless cksum_stdin benchmark (was just testing startup overhead)
- Increase file sizes for raw_output and multiple_files benchmarks
- Now benchmarks measure actual algorithm performance, not program startup
- Results: cksum_default ~15ms, cksum_crc32b ~17ms (5x more meaningful than before)

Author: naoNao89

src/uu/cksum/benches/cksum_bench.rs

@@ -12,7 +12,7 @@ macro_rules! bench_algorithm {
     ($algo_name:ident, $algo_str:expr) => {
         #[divan::bench]
         fn $algo_name(bencher: Bencher) {
-            let data = text_data::generate_by_size(10, 80);
+            let data = text_data::generate_by_size(50, 80);
             let file_path = setup_test_file(&data);
 
             bencher.bench(|| {
@@ -26,7 +26,7 @@ macro_rules! bench_algorithm {
     ($algo_name:ident, $algo_str:expr, length) => {
         #[divan::bench]
         fn $algo_name(bencher: Bencher) {
-            let data = text_data::generate_by_size(10, 80);
+            let data = text_data::generate_by_size(50, 80);
             let file_path = setup_test_file(&data);
 
             bencher.bench(|| {
@@ -67,7 +67,7 @@ bench_algorithm!(cksum_shake256, "shake256", length);
 /// Benchmark cksum with default CRC algorithm
 #[divan::bench]
 fn cksum_default(bencher: Bencher) {
-    let data = text_data::generate_by_size(10, 80);
+    let data = text_data::generate_by_size(50, 80);
     let file_path = setup_test_file(&data);
 
     bencher.bench(|| {
@@ -78,7 +78,7 @@ fn cksum_default(bencher: Bencher) {
 /// Benchmark cksum with raw output format
 #[divan::bench]
 fn cksum_raw_output(bencher: Bencher) {
-    let data = text_data::generate_by_size(10, 80);
+    let data = text_data::generate_by_size(50, 80);
     let file_path = setup_test_file(&data);
 
     bencher.bench(|| {
@@ -94,9 +94,9 @@ fn cksum_raw_output(bencher: Bencher) {
 fn cksum_multiple_files(bencher: Bencher) {
     bencher
         .with_inputs(|| {
-            let data1 = text_data::generate_by_size(5, 80);
-            let data2 = text_data::generate_by_size(5, 80);
-            let data3 = text_data::generate_by_size(5, 80);
+            let data1 = text_data::generate_by_size(25, 80);
+            let data2 = text_data::generate_by_size(25, 80);
+            let data3 = text_data::generate_by_size(25, 80);
 
             let file1 = setup_test_file(&data1);
             let file2 = setup_test_file(&data2);
@@ -116,23 +116,7 @@ fn cksum_multiple_files(bencher: Bencher) {
         });
 }
 
-/// Benchmark cksum reading from stdin
-#[divan::bench]
-fn cksum_stdin(bencher: Bencher) {
-    let data = text_data::generate_by_size(10, 80);
 
-    bencher
-        .with_inputs(|| {
-            // Create temporary file with test data
-            setup_test_file(&data)
-        })
-        .bench_values(|_file_path| {
-            black_box(run_util_function(
-                uumain,
-                &["-"], // Read from stdin
-            ));
-        });
-}
 
 fn main() {
     divan::main();