From b0a75b45a6d99e73472906cc668d1c7804f5147b Mon Sep 17 00:00:00 2001
From: Luke Gorrie <luke@snabb.co>
Date: Sat, 8 Oct 2016 16:32:12 +0000
Subject: [PATCH 1/2] Added bench/roulette.lua

This benchmark exhibits non-deterministic performance.
---
 bench/roulette.lua | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 bench/roulette.lua

diff --git a/bench/roulette.lua b/bench/roulette.lua
new file mode 100644
index 0000000..77c9fbb
--- /dev/null
+++ b/bench/roulette.lua
@@ -0,0 +1,20 @@
+-- Russian Roulette simulator
+-- This benchmark includes randomness from an external source that can
+-- produce non-deterministic performance.
+-- See https://github.com/LuaJIT/LuaJIT/issues/218
+
+math.randomseed(os.time())
+
+local population = 100e6
+local live = 0
+local die  = 0
+
+for i = 1, population do
+   if math.random(6) == 6 then
+      die = die + 1
+   else
+      live = live + 1
+   end
+end
+
+print(("Survived %d/%d (%.3f%%)"):format(live, population, live*100/(live+die)))

From a71cd6d99cac83d71730860ca94b901385d6c46d Mon Sep 17 00:00:00 2001
From: Luke Gorrie <luke@snabb.co>
Date: Sun, 9 Oct 2016 08:59:43 +0000
Subject: [PATCH 2/2] roulette: Stop seeding the random number generator

The test harness shuold do this in some suitable way e.g. with values
that are reproducible but still contain entropy for the JIT.
---
 bench/roulette.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bench/roulette.lua b/bench/roulette.lua
index 77c9fbb..968d42a 100644
--- a/bench/roulette.lua
+++ b/bench/roulette.lua
@@ -3,7 +3,8 @@
 -- produce non-deterministic performance.
 -- See https://github.com/LuaJIT/LuaJIT/issues/218
 
-math.randomseed(os.time())
+-- (Let the test harness determine the random seed)
+-- math.randomseed(os.time())
 
 local population = 100e6
 local live = 0