bigquery: add simple benchmarks

tests/perf/BigQuery/Benchmark.php

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+<?php
+/**
+ * Copyright 2017 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+require 'vendor/autoload.php';
+
+use Google\Cloud\BigQuery\BigQueryClient;
+
+if (count($argv) < 2) {
+    print("usage: php {$argv[0]} <queries.json>");
+    exit(1);
+}
+
+$requests = json_decode(file_get_contents($argv[1]));
+
+$bigQuery = new BigQueryClient();
+
+foreach ($requests as $request) {
+    $start = microtime(true);
+    $queryResults = $bigQuery->runQuery($request, [
+        'useLegacySql' => false,
+    ]);
+
+    while (!$queryResults->isComplete()) {
+        sleep(1);
+        $queryResults->reload();
+    }
+
+    $rows = 0;
+    $cols = 0;
+    $firstByteDur = 0;
+
+    foreach ($queryResults->rows() as $row) {
+        $rows++;
+        if ($cols == 0) {
+            $firstByteDur = microtime(true) - $start;
+            $cols = count($row);
+        } elseif ($cols != count($row)) {
+            throw new Exception("expected $cols cols, found " . count($row));
+        }
+    }
+
+    $totalDur = microtime(true)-$start;
+    print "query $request: $rows rows, $cols cols, first byte $firstByteDur, total $totalDur\n";
+}

tests/perf/BigQuery/README.md

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+# BigQuery Benchmark
+This directory contains benchmarks for BigQuery client.
+
+## Usage
+From the `google-cloud-php` directory, set up by running `composer install`.
+
+`php tests/perf/BigQuery/Benchmark.php tests/perf/BigQuery/queries.json`
+
+BigQuery service caches requests so the benchmark should be run
+at least twice, disregarding the first result.

tests/perf/BigQuery/queries.json

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+[
+  "SELECT * FROM `nyc-tlc.yellow.trips` LIMIT 10000",
+  "SELECT * FROM `nyc-tlc.yellow.trips` LIMIT 100000",
+  "SELECT * FROM `nyc-tlc.yellow.trips` LIMIT 1000000",
+  "SELECT title FROM `bigquery-public-data.samples.wikipedia` ORDER BY title LIMIT 1000",
+  "SELECT title, id, timestamp, contributor_ip FROM `bigquery-public-data.samples.wikipedia` WHERE title like 'Blo%' ORDER BY id",
+  "SELECT * FROM `bigquery-public-data.baseball.games_post_wide` ORDER BY gameId",
+  "SELECT * FROM `bigquery-public-data.samples.github_nested` WHERE repository.has_downloads ORDER BY repository.created_at LIMIT 10000",
+  "SELECT repo_name, path FROM `bigquery-public-data.github_repos.files` WHERE path LIKE '%.java' ORDER BY id LIMIT 1000000"
+]