diff --git a/examples/hist-interval.rs b/examples/hist-interval.rs
index 80164b4..10428cd 100644
--- a/examples/hist-interval.rs
+++ b/examples/hist-interval.rs
@@ -1,3 +1,5 @@
+#![feature(duration_from_micros)]
+#![allow(unused)]
 
 extern crate logging;
 
@@ -6,13 +8,59 @@ use std::thread;
 
 use logging::hist::{Entry, HistLog, nanos};
 
-const N_SECS: u64 = 60 * 60;
+const N_SECS: u64 = 30;
+
+//const N_THREADS: usize = 48;
+
+macro_rules! n_threads {
+    ($n:expr) => {
+        const N_THREADS: usize = $n;
+        const NAME: &'static str = concat!("sleeptest_", stringify!($n));
+    }
+}
+
+n_threads!(96);
 
 fn main() {
+    ::std::process::exit(test_n());
+}
+
+fn test_n() -> i32 {
     let start = Instant::now();
-    let mut a = HistLog::new("test", "a", Duration::from_millis(1000));
-    let mut b = a.clone_with_tag("b");
-    let mut c = b.clone_with_tag("c");
+    let hist = HistLog::new(NAME, "master", Duration::from_millis(100));
+    for _ in 0..N_THREADS {
+        let mut a = hist.clone_with_tag("sleep_1ns");
+        thread::spawn(move || {
+
+            let mut prev = Instant::now();
+            let mut loop_time = Instant::now();
+
+            loop {
+                prev = loop_time;
+                loop_time = Instant::now();
+                a.record(nanos(loop_time - prev));
+                a.check_send(loop_time);
+
+
+                if loop_time - start > Duration::from_secs(N_SECS) { break }
+
+                thread::sleep(Duration::new(0, 1));
+                //thread::yield_now();
+            }
+        });
+    }
+
+    thread::sleep(Duration::from_secs(N_SECS));
+
+    0
+}
+
+fn test_3() -> i32 {
+    let start = Instant::now();
+    let hist = HistLog::new("sleeptest", "master", Duration::from_millis(100));
+    let mut a = hist.clone_with_tag("yield");
+    let mut b = hist.clone_with_tag("sleep_0");
+    let mut c = hist.clone_with_tag("sleep_100ns");
 
     thread::spawn(move || {
 
@@ -31,7 +79,8 @@ fn main() {
 
             i += 1;
             //if i % 100 == 0 { thread::sleep(Duration::new(0, 0)); }
-            thread::sleep(Duration::new(0, 0));
+            //thread::sleep(Duration::new(0, 0));
+            thread::yield_now();
         }
     });
 
@@ -70,7 +119,10 @@ fn main() {
         i += 1;
         //if i % 100_000 == 0 { thread::sleep(Duration::from_millis(10)); }
         //if i % 100 == 0 { thread::sleep(Duration::new(0, 0)); }
-        thread::sleep(Duration::new(0, 0));
+        thread::sleep(Duration::new(0, 100));
     }
+
+    0
 }
 
+