Vendor things

third-party/vendor/crossbeam-epoch/benches/flush.rs

@@ -0,0 +1,52 @@
+#![feature(test)]
+
+extern crate test;
+
+use std::sync::Barrier;
+
+use crossbeam_epoch as epoch;
+use crossbeam_utils::thread::scope;
+use test::Bencher;
+
+#[bench]
+fn single_flush(b: &mut Bencher) {
+    const THREADS: usize = 16;
+
+    let start = Barrier::new(THREADS + 1);
+    let end = Barrier::new(THREADS + 1);
+
+    scope(|s| {
+        for _ in 0..THREADS {
+            s.spawn(|_| {
+                epoch::pin();
+                start.wait();
+                end.wait();
+            });
+        }
+
+        start.wait();
+        b.iter(|| epoch::pin().flush());
+        end.wait();
+    })
+    .unwrap();
+}
+
+#[bench]
+fn multi_flush(b: &mut Bencher) {
+    const THREADS: usize = 16;
+    const STEPS: usize = 10_000;
+
+    b.iter(|| {
+        scope(|s| {
+            for _ in 0..THREADS {
+                s.spawn(|_| {
+                    for _ in 0..STEPS {
+                        let guard = &epoch::pin();
+                        guard.flush();
+                    }
+                });
+            }
+        })
+        .unwrap();
+    });
+}