benchmark(ServerRendering) add benchmarks for different renderers

benchmarks/server_rendering_benchmark.rb

@@ -0,0 +1,51 @@
+# - `gem install duktape`
+# - Remove `JavaScriptCore` from RUNTIMES if you're not on mac
+# - `ruby -I lib  benchmarks/server_rendering_benchmark.rb`
+
+require 'react-rails'
+require 'duktape'
+require 'benchmark'
+
+SLOW_COMPONENT = "
+var SlowComponent = React.createClass({
+  render: function() {
+    var rand = 0
+    for (var i = 0; i < 10000; i++) {
+      rand = rand + (Math.random() * i)
+    }
+    return React.createElement('h1', rand + ' :)')
+  }
+})
+"
+
+REACT_JS_PATH = File.expand_path("../../vendor/react/react.js", __FILE__)
+JS_CODE = File.read(REACT_JS_PATH) + SLOW_COMPONENT
+
+React::ServerRendering.renderer = React::ServerRendering::ExecJSRenderer
+React::ServerRendering.renderer_options = {code: JS_CODE}
+React::ServerRendering.pool_timeout = 10
+
+def test_runtime(runtime, renders:, pool_size:)
+  ExecJS.runtime = runtime
+  React::ServerRendering.pool_size = pool_size
+  React::ServerRendering.reset_pool
+
+  renders.times do
+    React::ServerRendering.render("SlowComponent", {}, {})
+  end
+end
+
+RUNTIMES = [
+  ExecJS::Runtimes::RubyRacer,
+  ExecJS::Runtimes::Duktape,
+  ExecJS::Runtimes::JavaScriptCore,
+  ExecJS::Runtimes::Node,
+]
+
+Benchmark.bm(25) do |x|
+  [1, 10, 25].each do |pool_size|
+    RUNTIMES.each do |runtime|
+      x.report("#{runtime.name}, #{pool_size}x") { test_runtime(runtime, renders: 50, pool_size: pool_size)}
+    end
+  end
+end