rust: add startup performance test program

Author: jwatson0

runtime/rust-perf/.gitignore

@@ -0,0 +1 @@
+target/

runtime/rust-perf/Cargo.lock

@@ -0,0 +1,6 @@
+[package]
+name = "rust-perf"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

runtime/rust-perf/Cargo.toml

@@ -0,0 +1,4 @@
+fn main() {
+    let x = 2 + 2;
+    println!("2 + 2 = {}", x);
+}

runtime/rust-perf/src/main.rs

@@ -0,0 +1,22 @@
+
+roughly 1000/sec
+
+$ time for ((i=0;i<10;i++)) ; do target/release/rust-perf >/dev/null ; done
+real    0m0.055s
+user    0m0.031s
+sys     0m0.013s
+
+$ time for ((i=0;i<100;i++)) ; do target/release/rust-perf >/dev/null ; done
+real    0m0.176s
+user    0m0.082s
+sys     0m0.059s
+
+$ time for ((i=0;i<1000;i++)) ; do target/release/rust-perf >/dev/null ; done
+real    0m1.058s
+user    0m0.723s
+sys     0m0.339s
+
+$ time for ((i=0;i<10000;i++)) ; do target/release/rust-perf >/dev/null ; done
+real    0m9.592s
+user    0m7.098s
+sys     0m2.936s