Fix benchmarks

bench/bench_decode.lua

@@ -63,10 +63,10 @@ for i, name in ipairs(libs) do
   end
 
   -- Warmup (for LuaJIT)
-  bench.run(name, 1, function() json.decode(text) end)
+  bench.run(name, 10, function() json.decode(text) end)
 
   -- Run and push results
-  local res = bench.run(name, 10, function() json.decode(text) end)
+  local res = bench.run(name, 100, function() json.decode(text) end)
   table.insert(results, res)
 end
 

bench/bench_encode.lua

@@ -51,10 +51,10 @@ for i, name in ipairs(libs) do
   end
 
   -- Warmup (for LuaJIT)
-  bench.run(name, 1, function() json.encode(data) end)
+  bench.run(name, 10, function() json.encode(data) end)
 
   -- Run and push results
-  local res = bench.run(name, 10, function() json.encode(data) end)
+  local res = bench.run(name, 100, function() json.encode(data) end)
   table.insert(results, res)
 end
 

bench/util/bench.lua

@@ -5,6 +5,10 @@ local fmt = string.format
 
 
 function bench.run(name, count, func)
+  -- Ensure all garbage is collected
+  for _ = 1, 10 do -- cycles
+    collectgarbage()
+  end
   -- Run bench
   local res = {}
   for i = 1, count do