added cs3214bench.lua

tests/cs3214bench.lua

@@ -0,0 +1,41 @@
+--
+-- Lua script to be used with wrk for CS 3214 benchmarking.
+--
+-- @author godmar, CS 3214 Spring 2016
+--
+--
+
+-- From: http://regex.info/blog/lua/json
+
+luajson = os.getenv("JSON_LUA")
+JSON = (loadfile (luajson))() -- one-time load of the routines
+
+function prepare_stat(stat)
+   pc = { }
+   for _, p in pairs({ 50, 90, 95, 99, 99.999 }) do
+      pc[tostring(p)] = stat:percentile(p)
+   end
+   return {
+       min = stat.min,
+       max = stat.max,
+       mean = stat.mean,
+       stdev = stat.stdev,
+       percentiles = pc
+   }
+end
+
+done = function(summary, latency, requests)
+   -- we would like to include other parameters here, such as
+   -- the number of threads or connections per thread, but
+   -- these do not appear to be accessible at this point.
+   result = {
+       summary = summary,
+       latency = prepare_stat(latency),
+       requests = prepare_stat(requests)
+   }
+   ofile = os.getenv("JSON_OUTPUT_FILE")
+   print (string.format("Writing results to: %s", ofile))
+   local f = assert(io.open(ofile, "w"))
+   f:write(JSON:encode_pretty(result))
+   f:close()
+end