Benchmark introspecting a schema built from SDL in a supplied file. (#1163)

* Benchmark introspecting a schema built from SDL in a supplied file.

Use it like so:

```shell
yarn run benchmark
````

Additionally there is a profile command which runs the benchmark with `--prof`:

```shell
yarn run profile
````

Note that on Ubuntu 16.04 this requires:

```shell
sudo apt install linux-tools-common gawk linux-tools-generic linux-tools-4.10.0-35-generic
sudo sh -c 'echo 1 >/proc/sys/kernel/perf_event_paranoid'
```

On my laptop it produces this:

```
$ yarn run benchmark

> [email protected] benchmark /home/osboxes/graphql-js
> babel-node ./resources/benchmark/run.js

introspectionQuery x 24.59 ops/sec ±3.87% (45 runs sampled)
```

* Move into benchmark tests

Author: mohawk2

resources/benchmark.js

@@ -53,7 +53,7 @@ function prepareRevision(revision) {
         (cd "${dir}" && yarn install);
       fi &&
       # Copy in local tests so the same logic applies to each revision.
-      for file in $(cd "${LOCAL_DIR}src"; find . -path '*/__tests__/*.js');
+      for file in $(cd "${LOCAL_DIR}src"; find . -path '*/__tests__/*');
         do cp "${LOCAL_DIR}src/$file" "${dir}/src/$file";
       done &&
       (cd "${dir}" && yarn run ${BUILD_CMD})
@@ -82,18 +82,22 @@ function runBenchmark(benchmark, revisions) {
   const suite = new Suite(modules[0].name, {
     onStart(event) {
       console.log('⏱️  ' + event.currentTarget.name);
+      beautifyBenchmark.reset();
     },
     onCycle(event) {
       beautifyBenchmark.add(event.target);
     },
+    onError(event) {
+      console.error(event.target.error);
+    },
     onComplete() {
       beautifyBenchmark.log();
     },
   });
   for (let i = 0; i < revisions.length; i++) {
     suite.add(revisions[i], modules[i].measure);
   }
-  suite.run();
+  suite.run({ async: false });
 }
 
 // Prepare all revisions and run benchmarks matching a pattern against them.

src/utilities/__tests__/buildASTSchema-benchmark.js

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { join } from 'path';
+import { readFileSync } from 'fs';
+import { parse } from '../../';
+import { buildASTSchema } from '../buildASTSchema';
+
+const schemaAST = parse(
+  readFileSync(join(__dirname, 'github-schema.graphql'), 'utf8'),
+);
+
+export const name = 'Build Schema from AST';
+export function measure() {
+  buildASTSchema(schemaAST);
+}

src/utilities/__tests__/buildClientSchema-benchmark.js

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import { join } from 'path';
+import { readFileSync } from 'fs';
+import { buildClientSchema } from '../buildClientSchema';
+
+const schemaJSON = JSON.parse(
+  readFileSync(join(__dirname, 'github-schema.json'), 'utf8'),
+);
+
+export const name = 'Build Schema from Introspection';
+export function measure() {
+  buildClientSchema(schemaJSON.data);
+}