%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* Copyright 2019 Google LLC
*
* 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.
*/
include __DIR__ . '/vendor/autoload.php';
use Google\CRC32\Builtin;
use Google\CRC32\CRC32;
use Google\CRC32\Google;
use Google\CRC32\PHP;
use Google\CRC32\PHPSlicedBy4;
define('min_duration', 5); // Min duration of test in seconds.
define('max_duration', 30); // Max duration of test in seconds.
define('min_iterations', 10000); // Min number of iterations.
/*
Tested on my mid-2014 MacBook Pro (with SSE4.2)
Google CRC Benchmarks
CRC32CBenchmark/Public/256 214 ns 213 ns 3152131 bytes_per_second=1.11688G/s
CRC32CBenchmark/Public/4096 1975 ns 1974 ns 346883 bytes_per_second=1.9328G/s
CRC32CBenchmark/Public/65536 31805 ns 31782 ns 21701 bytes_per_second=1.92044G/s
CRC32CBenchmark/Public/1048576 508704 ns 508373 ns 1312 bytes_per_second=1.92096G/s
CRC32CBenchmark/Public/16777216 8526064 ns 8516872 ns 78 bytes_per_second=1.83459G/s
CRC32CBenchmark/Portable/256 363 ns 363 ns 1900480 bytes_per_second=672.139M/s
CRC32CBenchmark/Portable/4096 4610 ns 4607 ns 150221 bytes_per_second=847.9M/s
CRC32CBenchmark/Portable/65536 72886 ns 72815 ns 9168 bytes_per_second=858.341M/s
CRC32CBenchmark/Portable/1048576 1151197 ns 1150417 ns 585 bytes_per_second=869.25M/s
CRC32CBenchmark/Portable/16777216 18655381 ns 18640083 ns 36 bytes_per_second=858.365M/s
CRC32CBenchmark/Sse42/256 211 ns 211 ns 3245158 bytes_per_second=1.13004G/s
CRC32CBenchmark/Sse42/4096 1959 ns 1958 ns 347583 bytes_per_second=1.94816G/s
CRC32CBenchmark/Sse42/65536 32041 ns 32013 ns 21616 bytes_per_second=1.90658G/s
CRC32CBenchmark/Sse42/1048576 514282 ns 514035 ns 1296 bytes_per_second=1.8998G/s
CRC32CBenchmark/Sse42/16777216 8437749 ns 8433051 ns 78 bytes_per_second=1.85283G/s
CRC32_PHP 256 1500 11.48 MB/s
CRC32_Builtin 256 1500 315.81 MB/s
CRC32C_Google 256 1500 1078.78 MB/s
CRC32_PHP 4096 1500 11.65 MB/s
CRC32_Builtin 4096 1500 457.41 MB/s
CRC32C_Google 4096 1500 10836.76 MB/s
CRC32_PHP 1048576 118 12.27 MB/s
CRC32_Builtin 1048576 1500 468.74 MB/s
CRC32C_Google 1048576 1500 24684.46 MB/s
CRC32_PHP 16777216 8 12.24 MB/s
CRC32_Builtin 16777216 276 461.51 MB/s
CRC32C_Google 16777216 1500 20221.71 MB/s
*/
function test($crc, $chunk_size)
{
//xdebug_start_trace();
$name = get_class($crc);
$chunk = random_bytes($chunk_size); // TODO for php 5 use https://github.com/paragonie/random_compat
$i = 0;
$now = microtime(true);
$start = $now;
$duration = 0;
while (true) {
$crc->update($chunk);
$i++;
$now = microtime(true);
$duration = ($now - $start);
if ($duration >= max_duration) {
break;
}
if ($duration >= min_duration && $i >= min_iterations) {
break;
}
}
// Very quick sanity check
if ($crc->hash() == '00000000') {
exit($name . ' crc check failed');
}
$bytes = $i * $chunk_size;
echo sprintf("%s\t%10d\t%5d\t%8.2f MB/s\n", $name, $chunk_size, $i, $bytes / ($now - $start) / 1000000);
}
foreach (array(256, 4096, 1048576, 16777216) as $chunk_size) {
test(new PHP(CRC32::CASTAGNOLI), $chunk_size);
test(new PHPSlicedBy4(CRC32::CASTAGNOLI), $chunk_size);
// Using IEEE, avoiding the CASTAGNOLI version crc32c.so adds.
test(new Builtin(CRC32::IEEE), $chunk_size);
test(new Google(), $chunk_size);
}
Zerion Mini Shell 1.0