Added benchmark for SSR (vuejs#2842)

- Includes `renderToStream` and `renderToString`
- Added SSR benchmark README.md
- Added npm `bench:ssr` script
- Renders table with 1000 rows with 10 columns (10 thousand components)

benchmarks/ssr/README.md

@@ -0,0 +1,13 @@
+# Vue.js SSR benchmark
+
+This benchmark renders a table of 1000 rows with 10 columns (10 thousand components). This benchmark is to demonstrate the overall speeds of Vue.js SSR and time to content comparison between `renderToString` and `renderToStream`.
+
+To view the results follow the run section. Note that the overall completion time for the results are variable, this is due to other system related variants at run time (available memory, processing ect). In ideal circumstances both should finish within equal times.
+
+`renderToStream` pipes the content through a stream which gives massive performance benefits over renderToString. This can be observed through the benchmark.
+
+### run
+
+``` bash
+npm run bench:ssr
+```

benchmarks/ssr/common.js

@@ -0,0 +1,86 @@
+'use strict'
+
+const compiler = require('../../dist/compiler.js')
+const self = (global || root)
+
+self.performance = {
+  now: function () {
+    var hrtime = process.hrtime()
+    return ((hrtime[0] * 1000000 + hrtime[1] / 1000) / 1000)
+  }
+}
+
+function generateGrid (rowCount, columnCount) {
+  var grid = []
+
+  for (var r = 0; r < rowCount; r++) {
+    var row = { id: r, items: [] }
+    for (var c = 0; c < columnCount; c++) {
+      row.items.push({ id: (r + '-' + c) })
+    }
+    grid.push(row)
+  }
+
+  return grid
+}
+
+const gridData = generateGrid(1000, 10)
+
+var perfMixin = {
+  computed: {
+    performance: {
+      cached: false,
+      get: function () {
+        return (self.performance.now() - self.s).toFixed(2)
+      }
+    }
+  }
+}
+
+var gridComponent = {
+  template: '<div><h1>{{ performance }}ms</h1><my-table></my-table></div>',
+  mixins: [perfMixin],
+  components: {
+    myTable: {
+      data: function () {
+        return {
+          grid: gridData
+        }
+      },
+      template: '<table width="100%" cellspacing="2"><row v-for="row in grid" :row="row"></row></table>',
+      components: {
+        row: {
+          props: ['row'],
+          mixins: [perfMixin],
+          template: '<tr><th>{{ performance }}ms</th><column v-for="item in row.items"></column></tr>',
+          components: {
+            column: {
+              mixins: [perfMixin],
+              template: '<td class="item">{{ performance }}ms</td>'
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+function createCompiledOptions (options) {
+  const res = compiler.compileToFunctions(options.template, {
+    preserveWhitespace: false
+  })
+  Object.assign(options, res)
+  delete options.template
+  if (options.components) {
+    const keys = Object.keys(options.components)
+    let total = keys.length
+    while (total) {
+      const name = keys[total - 1]
+      options.components[name] = createCompiledOptions(options.components[name])
+      total--
+    }
+  }
+  return options
+}
+
+module.exports = createCompiledOptions(gridComponent)

benchmarks/ssr/renderToStream.js

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+'use strict'
+
+const Vue = require('../../dist/vue.common.js')
+const createRenderer = require('../../dist/server-renderer.js')
+const renderToStream = createRenderer().renderToStream
+const gridComponent = require('./common.js')
+
+console.log('--- renderToStream --- ')
+const self = (global || root)
+self.s = self.performance.now()
+
+const stream = renderToStream(new Vue(gridComponent))
+let str = ''
+const stats = []
+stream.on('data', chunk => {
+  str += chunk
+  stats.push(self.performance.now())
+})
+stream.on('end', () => {
+  stats.push(self.performance.now())
+  stats.forEach((val, index) => {
+    const type = index !== stats.length - 1 ? 'Chunk' : 'Complete'
+    console.log(type + ' time: ' + (val - self.s).toFixed(2) + 'ms')
+  })
+  console.log()
+})

benchmarks/ssr/renderToString.js

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+'use strict'
+
+const Vue = require('../../dist/vue.common.js')
+const createRenderer = require('../../dist/server-renderer.js')
+const renderToString = createRenderer().renderToString
+const gridComponent = require('./common.js')
+
+console.log('--- renderToString --- ')
+const self = (global || root)
+self.s = self.performance.now()
+
+renderToString(new Vue(gridComponent), () => {
+  console.log('Complete time: ' + (self.performance.now() - self.s).toFixed(2) + 'ms')
+  console.log()
+})

package.json

@@ -23,7 +23,8 @@
     "test:unit": "NODE_ENV=development karma start build/karma.unit.config.js",
     "test:cover": "NODE_ENV=development karma start build/karma.cover.config.js",
     "test:e2e": "npm run build -- vue.js && node test/e2e/runner.js",
-    "test:ssr": "npm run build -- vue.common.js,compiler.js,server-renderer.js && NODE_ENV=development VUE_ENV=server jasmine JASMINE_CONFIG_PATH=test/ssr/jasmine.json"
+    "test:ssr": "npm run build -- vue.common.js,compiler.js,server-renderer.js && NODE_ENV=development VUE_ENV=server jasmine JASMINE_CONFIG_PATH=test/ssr/jasmine.json",
+    "bench:ssr": "npm run build -- vue.common.js,compiler.js,server-renderer.js && NODE_ENV=production VUE_ENV=server node benchmarks/ssr/renderToString.js && NODE_ENV=production VUE_ENV=server node benchmarks/ssr/renderToStream.js"
   },
   "repository": {
     "type": "git",