crc32_benchmark.php — ShareThis Dashboard for Google Analytics 3.3.2

googleanalytics / lib / analytics-admin / vendor / google / crc32 / crc32_benchmark.php

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crc32_benchmark.php

111 lines

1	<?php
2	/**
3	* Copyright 2019 Google LLC
4	*
5	* Licensed under the Apache License, Version 2.0 (the "License");
6	* you may not use this file except in compliance with the License.
7	* You may obtain a copy of the License at
8	*
9	* http://www.apache.org/licenses/LICENSE-2.0
10	*
11	* Unless required by applicable law or agreed to in writing, software
12	* distributed under the License is distributed on an "AS IS" BASIS,
13	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14	* See the License for the specific language governing permissions and
15	* limitations under the License.
16	*/
17
18	include __DIR__ . '/vendor/autoload.php';
19
20	use Google\CRC32\Builtin;
21	use Google\CRC32\CRC32;
22	use Google\CRC32\Google;
23	use Google\CRC32\PHP;
24	use Google\CRC32\PHPSlicedBy4;
25
26	define('min_duration', 5); // Min duration of test in seconds.
27	define('max_duration', 30); // Max duration of test in seconds.
28	define('min_iterations', 10000); // Min number of iterations.
29
30
31	/*
32	Tested on my mid-2014 MacBook Pro (with SSE4.2)
33
34	Google CRC Benchmarks
35	CRC32CBenchmark/Public/256 214 ns 213 ns 3152131 bytes_per_second=1.11688G/s
36	CRC32CBenchmark/Public/4096 1975 ns 1974 ns 346883 bytes_per_second=1.9328G/s
37	CRC32CBenchmark/Public/65536 31805 ns 31782 ns 21701 bytes_per_second=1.92044G/s
38	CRC32CBenchmark/Public/1048576 508704 ns 508373 ns 1312 bytes_per_second=1.92096G/s
39	CRC32CBenchmark/Public/16777216 8526064 ns 8516872 ns 78 bytes_per_second=1.83459G/s
40	CRC32CBenchmark/Portable/256 363 ns 363 ns 1900480 bytes_per_second=672.139M/s
41	CRC32CBenchmark/Portable/4096 4610 ns 4607 ns 150221 bytes_per_second=847.9M/s
42	CRC32CBenchmark/Portable/65536 72886 ns 72815 ns 9168 bytes_per_second=858.341M/s
43	CRC32CBenchmark/Portable/1048576 1151197 ns 1150417 ns 585 bytes_per_second=869.25M/s
44	CRC32CBenchmark/Portable/16777216 18655381 ns 18640083 ns 36 bytes_per_second=858.365M/s
45	CRC32CBenchmark/Sse42/256 211 ns 211 ns 3245158 bytes_per_second=1.13004G/s
46	CRC32CBenchmark/Sse42/4096 1959 ns 1958 ns 347583 bytes_per_second=1.94816G/s
47	CRC32CBenchmark/Sse42/65536 32041 ns 32013 ns 21616 bytes_per_second=1.90658G/s
48	CRC32CBenchmark/Sse42/1048576 514282 ns 514035 ns 1296 bytes_per_second=1.8998G/s
49	CRC32CBenchmark/Sse42/16777216 8437749 ns 8433051 ns 78 bytes_per_second=1.85283G/s
50
51	CRC32_PHP 256 1500 11.48 MB/s
52	CRC32_Builtin 256 1500 315.81 MB/s
53	CRC32C_Google 256 1500 1078.78 MB/s
54	CRC32_PHP 4096 1500 11.65 MB/s
55	CRC32_Builtin 4096 1500 457.41 MB/s
56	CRC32C_Google 4096 1500 10836.76 MB/s
57	CRC32_PHP 1048576 118 12.27 MB/s
58	CRC32_Builtin 1048576 1500 468.74 MB/s
59	CRC32C_Google 1048576 1500 24684.46 MB/s
60	CRC32_PHP 16777216 8 12.24 MB/s
61	CRC32_Builtin 16777216 276 461.51 MB/s
62	CRC32C_Google 16777216 1500 20221.71 MB/s
63
64	*/
65
66	function test($crc, $chunk_size)
67	{
68	//xdebug_start_trace();
69	$name = get_class($crc);
70	$chunk = random_bytes($chunk_size); // TODO for php 5 use https://github.com/paragonie/random_compat
71
72	$i = 0;
73	$now = microtime(true);
74	$start = $now;
75	$duration = 0;
76
77	while (true) {
78	$crc->update($chunk);
79
80	$i++;
81	$now = microtime(true);
82	$duration = ($now - $start);
83
84	if ($duration >= max_duration) {
85	break;
86	}
87	if ($duration >= min_duration && $i >= min_iterations) {
88	break;
89	}
90	}
91
92	// Very quick sanity check
93	if ($crc->hash() == '00000000') {
94	exit($name . ' crc check failed');
95	}
96
97
98	$bytes = $i * $chunk_size;
99
100	echo sprintf("%s\t%10d\t%5d\t%8.2f MB/s\n", $name, $chunk_size, $i, $bytes / ($now - $start) / 1000000);
101	}
102
103	foreach (array(256, 4096, 1048576, 16777216) as $chunk_size) {
104	test(new PHP(CRC32::CASTAGNOLI), $chunk_size);
105	test(new PHPSlicedBy4(CRC32::CASTAGNOLI), $chunk_size);
106
107	// Using IEEE, avoiding the CASTAGNOLI version crc32c.so adds.
108	test(new Builtin(CRC32::IEEE), $chunk_size);
109	test(new Google(), $chunk_size);
110	}
111