feat(true/false): add benchmarks for startup performance (#10996)

* feat(true/false): add benchmarks for startup performance

Add benchmarks to evaluate true/false command performance,
addressing GitHub issue #10837.

Benchmarks include:
- Function call benchmarks (measure uumain directly)
  * true_no_args, true_help, true_version, true_consecutive_calls
- Process spawn benchmarks (measure real command startup)
  * true_spawn_no_args, true_spawn_help, true_spawn_version

This allows comparison between hot path vs cold path performance
and internal logic vs real-world startup time.

* chore(true/false): reduce benchmarks to 2 essential cases

---------

Co-authored-by: naoNao89 <naoNao89@users.noreply.github.com>

Author: naoNao89

.github/workflows/benchmarks.yml

@@ -53,7 +53,9 @@ jobs:
           uu_wc,
           uu_factor,
           uu_date,
-          uu_csplit
+          uu_csplit,
+          uu_true,
+          uu_false
         ]
     steps:
       - uses: actions/checkout@v6

Cargo.lock

@@ -27,3 +27,11 @@ fluent = { workspace = true }
 [[bin]]
 name = "false"
 path = "src/main.rs"
+
+[dev-dependencies]
+divan = { workspace = true }
+uucore = { workspace = true, features = ["benchmark"] }
+
+[[bench]]
+name = "false_bench"
+harness = false

src/uu/false/Cargo.toml

@@ -0,0 +1,30 @@
+// This file is part of the uutils coreutils package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use divan::{Bencher, black_box};
+use uu_false::uumain;
+use uucore::benchmark::run_util_function;
+
+/// Benchmark the common case: false with no arguments
+#[divan::bench]
+fn false_no_args(bencher: Bencher) {
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &[]));
+    });
+}
+
+/// Benchmark multiple consecutive invocations (throughput test)
+#[divan::bench]
+fn false_consecutive_calls(bencher: Bencher) {
+    bencher.bench(|| {
+        for _ in 0..100 {
+            black_box(run_util_function(uumain, &[]));
+        }
+    });
+}
+
+fn main() {
+    divan::main();
+}

src/uu/false/benches/false_bench.rs

@@ -26,3 +26,11 @@ fluent = { workspace = true }
 [[bin]]
 name = "true"
 path = "src/main.rs"
+
+[dev-dependencies]
+divan = { workspace = true }
+uucore = { workspace = true, features = ["benchmark"] }
+
+[[bench]]
+name = "true_bench"
+harness = false

src/uu/true/Cargo.toml

@@ -0,0 +1,30 @@
+// This file is part of the uutils coreutils package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use divan::{Bencher, black_box};
+use uu_true::uumain;
+use uucore::benchmark::run_util_function;
+
+/// Benchmark the common case: true with no arguments
+#[divan::bench]
+fn true_no_args(bencher: Bencher) {
+    bencher.bench(|| {
+        black_box(run_util_function(uumain, &[]));
+    });
+}
+
+/// Benchmark multiple consecutive invocations (throughput test)
+#[divan::bench]
+fn true_consecutive_calls(bencher: Bencher) {
+    bencher.bench(|| {
+        for _ in 0..100 {
+            black_box(run_util_function(uumain, &[]));
+        }
+    });
+}
+
+fn main() {
+    divan::main();
+}