Vendor perf event

1 files changed, 30 insertions, 0 deletions

diff --git a/perf-event/examples/println-cpi.rs b/perf-event/examples/println-cpi.rs
new file mode 100644
index 0000000..6524c37
--- /dev/null
+++ b/perf-event/examples/println-cpi.rs
@@ -0,0 +1,30 @@
+fn main() -> std::io::Result<()> {
+    use perf_event::events::Hardware;
+    use perf_event::{Builder, Group};
+
+    let mut group = Group::new()?;
+    let cycles = Builder::new()
+        .group(&mut group)
+        .kind(Hardware::CPU_CYCLES)
+        .build()?;
+    let insns = Builder::new()
+        .group(&mut group)
+        .kind(Hardware::INSTRUCTIONS)
+        .build()?;
+
+    let vec = (0..=51).collect::<Vec<_>>();
+
+    group.enable()?;
+    println!("{:?}", vec);
+    group.disable()?;
+
+    let counts = group.read()?;
+    println!(
+        "cycles / instructions: {} / {} ({:.2} cpi)",
+        counts[&cycles],
+        counts[&insns],
+        (counts[&cycles] as f64 / counts[&insns] as f64)
+    );
+
+    Ok(())
+}